2003A&A...410..671M

Query : 2003A&A...410..671M

2003A&A...410..671M - Astronomy and Astrophysics, volume 410, 671-684 (2003/11-1)

Dependence of coronal X-ray emission on spot-induced brightness variations in cool main sequence stars.

MESSINA S., PIZZOLATO N., GUINAN E.F. and RODONO M.

Abstract (from CDS):

The maximum amplitude (Amax) of spot-induced brightness variations from long-term V-band photometry and the ratio LX/Lbol between X-ray and bolometric luminosities are suitable indicators of the level of magnetic activity in the photosphere and in the corona of late-type stars, respectively. By using these activity indicators we investigate the dependence of coronal X-ray emission on the level of photospheric starspot activity in a homogeneous sample of low mass main sequence field and cluster stars of different ages (IC 2602, IC 4665, IC 2391, α Persei, Pleiades and Hyades). First, the activity-rotation connection at the photospheric level is re-analysed, as well as its dependence on spectral type and age. The upper envelope of A_ max_ increases monotonically with decreasing rotational period (P) and Rossby number (R0) showing a break around 1.1d that separates two rotation regimes where the starspot activity shows different behaviours. The A_ max_-P and Amax-R0 relations are fitted with linear, exponential and power laws to look for the function which best represents the trend of the data. The highest values of Amax are found among K-type stars and at the ages of α Persei and Pleiades. We also analyse the activity-rotation connection at the coronal level as well as its dependence on spectral type. The level of X-ray emission increases with increasing rotation rate up to a saturation level. The rotational period at which saturation occurs is colour-dependent and increases with advancing spectral type. Also the LX/Lbol-P and LX/Lbol-R0 relations are fitted with linear, exponential and power laws to look for the best fitting function. Among the fastest rotating stars (P≤0.3d) there is evidence of super-saturation. Also the highest values of LX/Lbol are found among K-type stars. Finally, the photospheric-coronal activity connection is investigated by using for the first time the largest ever sample of light curve amplitudes as indicators of the magnetic filling factor. The activity parameters L_ X/Lbol_ and Amax are found to be correlated with each other, thus confirming the dependence of coronal activity on photospheric magnetic fields. More precisely, the LX/Lbol-Amax distribution shows the presence of an upper envelope, which is constant at the LX/Lbol≃-3.0 saturation level, and of a lower envelope. The best fit to the lower envelope is given by a power law with steepness decreasing from F-G to M spectral types. However, it is considered a tentative result, since the fit reduced chi-squares are large. Such spectral-type dependence may be related to a colour dependence of Amax on the total starspot filling factor, as well as to the coronal emission being possibly more sensitive to starspot activity variations in F- and G-type than in M-type stars. The LX/Lbol-Amax mean values for each cluster in our sample decrease monotonically with increasing age, showing that the levels of photospheric and coronal activity evolve in time according to a single power law till the Sun's age.

Abstract Copyright: ∼

Journal keyword(s): stars: activity - stars: late-type - stars: magnetic fields - stars: starspots - X-rays: stars

VizieR on-line data: <Available at CDS (J/A+A/410/671): table1.dat table2.dat refs.dat>

Simbad objects: 281

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Number of rows : 281
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 HD 987 Er* 00 13 53.0108292528 -74 41 17.850099516   9.48 8.724   7.933 G8V 106 0
2 V* PW And RS* 00 18 20.8895755560 +30 57 22.129174872   9.78 8.86 8.3 7.78 K2V 123 1
3 * 9 Cet BY* 00 22 51.7884553555 -12 12 33.969921319 7.29 7.05 6.39     G2.5V 487 0
4 V* BZ Scl RS* 01 11 43.1691074664 -25 57 30.156005520   10.32 9.68 9.47 9.16 K0III+(G) 20 0
5 HD 18134 BY* 02 51 52.9734663024 -61 37 04.601564148   9.71 8.83   7.815 K1V 41 0
6 HD 17925 RS* 02 52 32.1281856011 -12 46 10.968056223 7.48 6.91 6.05 5.34 4.89 K1V 514 0
7 V* BZ Cet BY* 03 00 02.8119278075 +07 44 59.118374397 9.635 8.908 7.955 7.436 6.994 K2.5Vk 139 0
8 Cl Melotte 20 15 * 03 08 32.93 +47 24 38.1           ~ 3 0
9 Cl Melotte 20 25 * 03 08 45.6009190056 +47 38 11.359047408   12.35 11.72 11.64   ~ 2 0
10 Cl Melotte 20 37 * 03 08 56.41 +48 43 34.2     12.61     ~ 8 0
11 HIP 14629 * 03 08 56.5974126768 +47 20 46.840578540   11.58 10.74     G0V 23 0
12 Cl Melotte 20 41 * 03 09 00.6306636576 +49 15 49.991149044   11.92 11.65     ~ 3 0
13 Cl Melotte 20 33 * 03 09 04.5572398992 +47 53 04.169842368   11.75 11.19     ~ 10 0
14 Cl Melotte 20 43 * 03 09 17.99 +48 17 39.3     12.84     ~ 8 0
15 Cl Melotte 20 60 Pe* 03 09 37.2338263752 +49 53 26.420359416   11.92 11.82     kA4hA7mA9Si 5 0
16 Cl Melotte 20 75 SB* 03 09 43.5706545456 +51 36 23.442000444   12.40 11.76     ~ 2 0
17 BD+50 708 ** 03 09 47.8640333160 +50 51 52.947704196   11.722 11.198 11.158   ~ 9 0
18 HIP 14697 * 03 09 52.0795481112 +48 28 15.421724112   11.59 10.98     G3V 30 0
19 BD+48 856 * 03 10 04.9616914224 +49 09 47.895687144   10.92 10.39     F8 4 0
20 Cl Melotte 20 70 * 03 10 34.59 +47 38 39.1     12.83     ~ 8 0
21 HD 19538 * 03 10 40.1433181584 +51 28 21.069883596   9.65 9.25     ~ 18 0
22 BD+49 863 * 03 10 41.7669149064 +50 31 32.068739676   11.79 11.09     ~ 28 0
23 Cl Melotte 20 91 * 03 10 47.9064563856 +50 01 03.680820696   12.15 10.61     ~ 8 0
24 Cl Melotte 20 95 * 03 11 01.24 +49 21 57.3           ~ 3 0
25 Cl Melotte 20 96 * 03 11 06.60 +49 31 13.0           ~ 2 0
26 Cl Melotte 20 102 ** 03 11 13.409088 +49 39 23.73804   11.221 10.638 10.453   ~ 2 0
27 HD 19625 Pe* 03 11 18.0096676416 +47 13 30.977761548   9.51 9.42     A 8 0
28 Cl Melotte 20 109 * 03 11 18.7667033760 +50 00 46.193928480   11.30 10.73     ~ 2 0
29 Cl Melotte 20 100 SB* 03 11 20.1780776616 +49 01 20.384604264   12.29 11.59     kA2hA5mA7 9 0
30 Cl Melotte 20 117 SB* 03 11 24.0146831712 +50 09 39.270666168   10.61 9.90     ~ 8 0
31 Cl Melotte 20 98 * 03 11 24.13 +48 35 15.9     12.80     ~ 8 0
32 Cl Melotte 20 110 * 03 11 26.1553176600 +49 29 41.917235532   12.43 11.65     ~ 7 0
33 HD 232762 * 03 11 30.2843062920 +51 05 10.909450140   10.59 9.18     K5 12 0
34 Cl Melotte 20 112 * 03 11 33.2455600051 +49 06 59.253815384   12.41 11.90     ~ 7 0
35 Cl Melotte 20 101 * 03 11 35.05 +47 59 22.8     13.85     ~ 8 0
36 Cl Melotte 20 108 * 03 11 35.6185603704 +48 38 39.981928992   11.77 11.30     ~ 2 0
37 HD 19636 * 03 11 37.1206011744 +49 16 04.691037648   10.19 9.02     ~ 14 0
38 HD 19655 * 03 11 41.1505525248 +48 03 14.805537120   8.95 8.64     F1Vnn 23 0
39 Cl Melotte 20 119 * 03 11 53.40 +48 09 54.6           ~ 2 0
40 Cl Melotte 20 114 * 03 12 00.20 +47 17 00.7     13.30     ~ 8 0
41 Cl Melotte 20 124 SB* 03 12 03.5373175584 +48 23 34.944348804   11.28 9.97     ~ 3 0
42 Cl Melotte 20 120 * 03 12 04.45 +47 34 03.4           ~ 2 0
43 Cl Melotte 20 121 * 03 12 08.3822060856 +47 23 30.650752032   11.78 11.45     ~ 2 0
44 Cl Melotte 20 122 * 03 12 15.5523921000 +46 59 03.329372004   12.29 11.74     ~ 2 0
45 HD 19721 * 03 12 25.9650442368 +49 10 07.887783576   9.52 9.10     G8V 7 0
46 Cl Melotte 20 139 * 03 12 34.0571330208 +47 06 39.763907928   11.96 12.36     ~ 3 0
47 Cl Melotte 20 156 * 03 12 51.5133674544 +47 35 35.005869960   11.84 11.78     ~ 3 0
48 BD+46 704 * 03 13 00.4284838680 +47 05 48.908784840   10.88 10.32     G0 3 0
49 HD 19805 * 03 13 05.2560841728 +49 00 33.855831288   8.07 7.96     B9.5V 90 0
50 Cl Melotte 20 169 * 03 13 27.8668802136 +47 20 30.909675768   9.82 9.76     ~ 5 0
51 Cl Melotte 20 189 ** 03 13 46.944288 +47 24 28.43604   12.148 11.465 11.300   ~ 2 0
52 Cl Melotte 20 193 * 03 13 49.6012887600 +47 19 19.281867600   11.88 11.46     G5-6V 5 0
53 HD 19901 * 03 13 49.6070701512 +47 55 06.147300612   9.35 7.64     K5 6 0
54 HD 19864 PM* 03 13 50.1738133896 +51 47 05.172429948 10.016 8.26 7.86     F5 28 0
55 HD 19893 * 03 13 50.3335382568 +49 34 07.963078584   7.183 7.155     B9V 53 0
56 Cl Melotte 20 196 * 03 13 54.8535276216 +47 00 37.297039680   11.97 11.60     ~ 2 0
57 Cl Melotte 20 197 Pu* 03 13 54.9673369488 +47 16 26.195946996   12.10 11.63     ~ 2 0
58 Cl Melotte 20 201 * 03 13 57.9962147232 +47 19 28.796747700   10.46 9.88     F8V 9 0
59 HD 19921 Pu* 03 14 03.9155247168 +47 48 09.420177600   7.81 7.73     B9 9 0
60 HD 19908 * 03 14 03.9557256720 +50 22 47.612984160   9.561 9.103 9.098   F3II-III 19 0
61 Cl Melotte 20 211 * 03 14 06.2748218952 +47 53 10.386661416           ~ 2 0
62 HD 19955 * 03 14 08.3513323824 +46 48 17.182808100   9.78 8.75     K0 4 0
63 HD 19954 * 03 14 16.6034471424 +48 34 40.239730956   9.53 9.22     A3 27 0
64 Cl Melotte 20 244 * 03 14 33.5466684864 +50 24 28.620613548   11.59 10.44     ~ 3 0
65 HD 20017 Be* 03 14 55.3113695280 +48 41 44.861305452 8.07 8.13 7.91     B5Ve 40 0
66 Cl Melotte 20 258 * 03 14 56.1472282104 +50 33 39.085715736   12.60 11.74     ~ 3 0
67 Cl Melotte 20 257 * 03 15 01.2574621824 +50 00 28.378457712   10.28 10.16     ~ 3 0
68 Cl Melotte 20 256 * 03 15 22.77 +47 16 41.1           ~ 2 0
69 V* V522 Per BY* 03 18 27.4049575488 +47 21 15.385103244   12.26 11.42     G3 39 0
70 * kap01 Cet BY* 03 19 21.6964175772 +03 22 12.714979884 5.71 5.52 4.85 4.27 3.91 G5V 890 0
71 V* V484 Per BY* 03 22 21.9201012551 +49 08 27.732216837   12.07 11.37     G6V 65 0
72 2MASS J03241706+4939002 Y*O 03 24 17.0663278560 +49 39 00.290330316   12.16 11.43     G6 37 0
73 * alf Per V* 03 24 19.3700924 +49 51 40.245455 2.64 2.27 1.79     F5Ib 833 1
74 V* V531 Per BY* 03 24 49.7161166568 +48 52 18.296130288   12.41 11.62     G5 55 0
75 Cl Melotte 20 628 * 03 24 58.7670654624 +50 15 24.102222228   11.75 11.20     F0 10 0
76 V* V688 Per BY* 03 26 04.2115135272 +48 48 07.024689252   11.16 10.59     F9V 29 0
77 2MASS J03261935+4913325 Y*O 03 26 19.3612702008 +49 13 32.495106360   12.37 11.61     G3 38 0
78 V* V532 Per BY* 03 26 22.2275044296 +49 25 37.501937904   11.98 11.27     G2-3V 66 0
79 Cl Melotte 20 OpC 03 26 28.1 +48 58 30           ~ 861 0
80 2MASS J03263370+5013545 Y*O 03 26 33.7118150064 +50 13 54.509502756   12.78 11.93   11.11 K0 22 0
81 2MASS J03264391+4954344 Y*O 03 26 43.9194233223 +49 54 34.396380062   11.7 10.7     G0V 32 0
82 V* V630 Per BY* 03 28 22.5413971680 +49 14 29.366325708   13.77 12.78   11.91 K0 24 0
83 BD+48 937 Y*O 03 31 28.9920796560 +48 59 28.350970944   10.69 10.08     F9.5V 33 0
84 * eps Eri BY* 03 32 55.8444911587 -09 27 29.739493865 5.19 4.61 3.73 3.00 2.54 K2V 1932 1
85 HD 21845 PM* 03 33 13.4905810704 +46 15 26.546978484   8.963 8.250 7.8 7.34 K2 93 0
86 V* V488 Tau Y*O 03 39 29.1987175992 +23 29 57.746028372   15.60 14.23   12.50 ~ 34 0
87 V* V500 Tau Y*O 03 42 21.5414722260 +24 39 52.819957175   15.89 14.48   12.66 M1.6 58 0
88 V* V810 Tau BY* 03 43 02.9441671032 +24 40 11.149283892 15.149 12.97 12.03   10.98 G8 83 0
89 V* V623 Tau Er* 03 43 36.9149941514 +24 23 38.323746784 18.373 15.68 14.30     M1.5 83 0
90 V* V963 Tau BY* 03 43 37.7294586035 +23 32 09.560933897 11.82 11.4 10.6     G5V 75 0
91 V* MR Tau Er* 03 43 52.1468914179 +24 50 29.809898223   16.00       M1.5 80 0
92 V* V1272 Tau BY* 03 44 03.5401148521 +24 30 15.284314309   11.8 10.762   9.933 G1V 88 0
93 Cl Melotte 22 250 Y*O 03 44 04.2464661604 +24 59 23.415055928   11.4 10.7     G2 64 0
94 V* V1168 Tau BY* 03 44 04.8395264080 +24 16 31.874754111   12.42 11.54     G4 85 0
95 V* V966 Tau BY* 03 44 11.2145003449 +23 22 45.575870257   12.30 11.46     ~ 114 0
96 V* V1169 Tau BY* 03 44 13.9194344229 +24 46 45.826637312   11.50 10.80     G0 89 0
97 V* V1038 Tau BY* 03 44 20.0898026175 +24 47 46.205031064   11.2 10.4 10.3   G1-2V 140 0
98 V* V1084 Tau RS* 03 44 20.5097544453 +24 46 22.305261833   11.92 11.04 10.7   G5V 77 0
99 V* V632 Tau Y*O 03 44 21.9055121220 +24 46 06.290599502   14.14 13.10 12.81   K4 88 0
100 V* MX Tau Er* 03 44 23.0586465475 +24 04 05.899403034   15.02 13.82 13.42   M0e 79 0
101 V* V1170 Tau BY* 03 44 26.2759113581 +24 35 22.939007310 14.435 12.288 11.461   10.520 G9 96 0
102 V* NP Tau Er* 03 44 28.0030714536 +24 10 17.615581608 15.965   13.46     M0.5Ve 78 0
103 V* V811 Tau BY* 03 45 21.1862906887 +23 43 38.888404751 14.771 13.67 12.57   11.24 G5 86 0
104 V* OU Tau Y*O 03 45 32.9384507670 +24 18 11.646082836   14.63 13.36   12.02 K4V 104 0
105 V* V1085 Tau BY* 03 45 35.3982230827 +24 04 59.563296540   10.73 11.92 10.04 9.37 F2 88 0
106 V* V1041 Tau Y*O 03 45 39.4002482170 +23 45 15.469362585 14.355 13.52 12.41 11.99 10.83 G9V 67 0
107 V* V855 Tau Y*O 03 45 40.1782648711 +24 37 38.007136109   10.6 9.9   9.05 F9V 96 1
108 V* V969 Tau BY* 03 45 42.1185203606 +24 54 21.622880032   10.18 9.56   8.82 G3 133 1
109 V* V812 Tau BY* 03 46 04.1263211184 +23 24 19.878193476 14.725 13.73 12.66   11.62 K3V 84 0
110 V* V813 Tau BY* 03 46 06.5022556056 +24 34 02.743919580   13.82 12.76 12.66 11.59 G5 83 0
111 V* V789 Tau Y*O 03 46 06.9047156616 +24 33 46.130006376   14.14 13.02 13.07 11.75 ~ 71 0
112 Cl Melotte 22 885 ** 03 46 07.775880 +24 52 00.72624   13.15 12.17 11.86 10.87 K3 58 0
113 V* V1189 Tau BY* 03 46 12.8676359335 +24 03 15.754257358   15.59 14.22   12.48 M1.4 63 0
114 BD+23 521 * 03 46 17.9919005844 +23 29 11.939258173 11.984 11.4 10.6   9.59 F8V 55 0
115 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3435 0
116 V* V641 Tau Y*O 03 46 27.7743108351 +23 35 33.771415161 15.602 14.28 13.05   11.52 G9 102 0
117 V* V1171 Tau BY* 03 46 28.4126681681 +24 26 02.158117224   11.85 11.10 10.5 10.26 G5V 89 1
118 V* V814 Tau BY* 03 46 39.3864483531 +24 01 46.867039992   13.04 12.13   11.24 K3V 100 0
119 V* V1065 Tau RS* 03 46 40.2476949658 +23 29 51.877806260 14.016 13.01 12.02   10.93 K0 82 0
120 V* V535 Tau Y*O 03 47 03.5824795963 +24 09 34.870154100   15.93 14.58   12.72 M2.4 75 0
121 V* V644 Tau Er* 03 47 07.3435619287 +23 13 34.891294898   14.71 13.52   12.09 K6.5e 73 0
122 V* V815 Tau BY* 03 47 13.5327654004 +23 42 51.437976573   13.45 12.41   11.43 K4V 91 0
123 V* V1172 Tau BY* 03 47 38.0074370120 +23 28 04.974381557   14.87 13.50   12.10 K1 66 0
124 HD 282967 Y*O 03 47 40.4453488845 +24 21 52.409176663   11.12 10.48   9.79 G5 91 0
125 V* V541 Tau Er* 03 47 41.1816807055 +23 44 25.019888142   15.21 13.95   12.37 M1.8 74 0
126 V* QX Tau Y*O 03 47 41.4393422685 +23 58 18.939833580   14.85 13.58   12.11 K5 99 0
127 V* V338 Tau SB* 03 47 59.7379938840 +24 43 52.667371956   14.71 13.51   12.00 K6e 68 0
128 BD+23 551 * 03 48 16.9038570375 +23 38 12.420299844 10.74 10.67 10.11   9.48 F9V 81 0
129 2MASS J03481705+2337435 * 03 48 17.0465936208 +23 37 43.573249956           F9V 24 0
130 V* V660 Tau Er* 03 48 28.0289494257 +23 18 02.731712608   13.66 12.60   11.43 K2V 103 0
131 V* V545 Tau Y*O 03 48 49.3174984680 +23 58 38.132788908   13.61 12.65   11.50 K3 87 0
132 V* V664 Tau Er* 03 49 20.5942028352 +24 46 35.976331956   13.71 12.67   11.40 K2.5V 90 0
133 V* V1089 Tau BY* 03 49 24.0523828704 +23 50 21.300884088   12.13 11.35     ~ 54 0
134 V* V1090 Tau BY* 03 49 33.1190204321 +23 47 43.404601495   11.58 10.87   10.19 G4V 74 0
135 V* V1173 Tau BY* 03 50 05.0528312880 +24 07 26.254695053   15.39 14.04   12.39 M1.1 59 0
136 V* V1174 Tau Y*O 03 50 34.5788909903 +24 30 27.979927785   13.60 12.60   11.52 G8 62 1
137 V* V1175 Tau BY* 03 50 40.0721202291 +23 55 58.950949335   10.9 10.5   9.61 F9 87 0
138 V* V1176 Tau Er* 03 50 54.3588780269 +23 50 05.237700840   12.43 11.48 10.99 10.47 K2 71 0
139 V* V378 Tau Y*O 03 51 05.5717147278 +24 44 12.404879275   15.14 13.89   12.35 M2.3 68 0
140 V* V1193 Tau BY* 03 51 12.0723635973 +23 55 57.495023891   16.40 14.74   12.90 M2Ve 58 0
141 V* V382 Tau Y*O 03 51 25.3410322392 +23 53 21.768200052   15.419 14.060   12.392 K9V: 54 0
142 V* V677 Tau Y*O 03 51 29.9401935192 +23 53 57.262301088   14.66 13.49   12.06 K6V: 64 0
143 V* V816 Tau BY* 03 51 53.3859880635 +24 23 13.082093440   13.67 12.69   11.54 K0V 80 0
144 V* V679 Tau TT* 03 52 02.2372961328 +24 39 47.681148816   13.57 11.41 11.89 10.77 K5e 128 0
145 HD 25893 BY* 04 07 34.35408 +38 04 28.3533           G9V(k) 146 0
146 HD 26913 BY* 04 15 25.7871375264 +06 11 58.751401236 7.790 7.580 6.920 6.554 6.195 G8V 218 0
147 V* V984 Tau BY* 04 16 33.4775734800 +21 54 26.882025156   9.944 9.125     ~ 174 0
148 HD 285690 BY* 04 18 19.2717491592 +16 05 17.992962636   10.532 9.548 9.015 8.557 K0 149 0
149 V* V893 Tau BY* 04 18 57.9745736544 +19 54 24.124484232   9.345 8.597 8.192 7.829 G9V 150 0
150 HD 27406 BY* 04 20 12.9666179232 +19 14 00.518450172   8.016 7.444 7.131 6.826 F9V+ 196 0
151 V* V988 Tau BY* 04 23 22.8504016872 +19 39 31.317351336   10.290 9.381     K0 123 0
152 V* V989 Tau BY* 04 23 25.2803352600 +15 45 47.242184616   11.885 10.472 10.19   K5V 121 0
153 V* V895 Tau BY* 04 24 12.4710867960 +14 45 29.565731196   8.217 7.583 8.43   G0V(e) 224 0
154 V* V990 Tau BY* 04 24 16.9397582328 +18 00 10.513833732   11.035 9.966 9.364 8.864 K5V 128 0
155 HD 27859 BY* 04 24 28.3269703416 +16 53 10.202918748   8.382 7.790     G2V 224 0
156 HD 285742 BY* 04 25 00.2471046840 +16 59 05.630869176   11.276 10.248 9.665 9.178 K4V 92 0
157 V* V992 Tau PM* 04 26 05.8393913496 +15 31 27.634430748 8.11 8.027 7.472 7.161 6.858 ~ 150 0
158 V* V906 Tau BY* 04 26 24.6221111736 +16 51 12.069956916 8.86 8.69 8.05 7.51 7.16 G1V 221 0
159 HD 28099 BY* 04 26 40.1217122952 +16 44 48.885808416 8.98 8.78 8.12 7.56 7.23 G2+V 419 0
160 HG 7-232 BY* 04 28 28.776432 +17 41 45.39120   13.58 12.12 11.88   M0.5Ve 64 0
161 V* V918 Tau BY* 04 28 37.2160468224 +19 44 26.481269436   9.316 8.580 8.182 7.816 G5 144 0
162 HD 28344 BY* 04 28 48.2984108040 +17 17 07.685984400 8.57 8.456 7.837 7.498 7.180 G2V 282 0
163 V* V1104 Tau BY* 04 29 00.1510553808 +16 20 46.807036080   15.826 14.290 14.113   M3.5e 44 0
164 HD 285805 BY* 04 29 30.9843838464 +16 14 41.229476412   11.48 10.629 10.02   K4V 91 0
165 HD 285773 BY* 04 29 31.6063777896 +17 53 35.460179628 10.28 9.761 8.934 8.486 8.093 K0V 201 0
166 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3074 0
167 V* V996 Tau BY* 04 32 50.1196981848 +16 00 20.931733080   9.85 8.900 9.02   K0V 111 0
168 V* V997 Tau BY* 04 32 59.4512605248 +15 49 08.284758672   9.396 8.641 8.235 7.867 ~ 166 0
169 HD 28992 BY* 04 34 35.3100676992 +15 30 16.642906992   8.530 7.898 7.556 7.226 ~ 209 0
170 HD 29310 BY* 04 37 31.9851921240 +15 08 47.260104684   8.153 7.545     G0 178 0
171 HD 29697 BY* 04 41 18.8552115035 +20 54 05.446927411 10.064 9.12 7.985 7.313 6.666 K4V 166 0
172 V* V1005 Ori BY* 04 59 34.8342878424 +01 47 00.669818328   11.48 10.107 9.603 8.239 M0Ve 342 0
173 V* V1192 Ori RS* 05 00 08.2195942104 +03 17 12.024920724   8.75 7.503   6.223 K1/2III 84 0
174 * 111 Tau BY* 05 24 25.4632701888 +17 23 00.726415944   5.52   4.7   F8V 339 0
175 V* AB Dor TT* 05 28 44.8712165880 -65 26 55.199147208 8.259 7.856 6.999 6.496 5.993 K0V 1021 0
176 V* UX Col RS* 05 28 56.518320 -33 28 15.46824   11.62 10.59 10.26 9.312 K3Ve 34 0
177 V* AG Lep BY* 05 30 19.0810600968 -19 16 31.831620600   10.22 9.54   8.96 G5V 22 0
178 V* AH Lep BY* 05 34 09.1623884232 -15 17 03.185067228   9.08 8.363   7.649 G2V 46 0
179 V* UY Pic RS* 05 36 56.8528399368 -47 57 52.883969472   8.77 7.676   6.699 K0V 135 0
180 HD 37394 BY* 05 41 20.3356800431 +53 28 51.808818686 7.58 7.07 6.23 5.54 5.11 K1 329 0
181 * chi01 Ori RS* 05 54 22.9829893 +20 16 34.222038 5.08 5.00 4.40 3.90 3.59 G0V 851 0
182 HD 42807 RS* 06 13 12.5028624208 +10 37 37.712484445   7.12   6.0   G5V 235 0
183 V* AO Men Er* 06 18 28.2078302088 -72 02 41.447954904   11.06 9.809 9.299 8.456 K4Ve 140 0
184 V* V1358 Ori BY* 06 19 08.0574987312 -03 26 20.361237864   8.52 7.95     G0V 116 0
185 V* V369 Gem RS* 07 02 23.3214968520 +25 50 45.558373812   8.73 7.987   7.174 G5 24 0
186 V* YZ CMi Er* 07 44 40.1723046464 +03 33 08.875227574 13.761 12.831 11.225 9.958 8.263 M4.0Ve 885 0
187 * 9 Pup SB* 07 51 46.30295 -13 53 52.9169           G0V 243 0
188 V* V478 Hya BY* 08 22 49.9527726648 +01 51 33.552251064   9.30 8.711   7.999 G1/2V 99 2
189 * pi.01 UMa BY* 08 39 11.7046112880 +65 01 15.263122512 6.33 6.26 5.64 5.12 4.79 G0.5V 567 0
190 V* V364 Vel BY* 08 39 53.0493554064 -52 57 56.847553812   12.75 11.89 11.69   K0 41 0
191 V* V365 Vel BY* 08 40 06.2321644608 -53 38 06.875687760   11.07 10.47 10.44   G0 39 0
192 IC 2391 OpC 08 41 10.1 -52 59 28           ~ 822 0
193 V* V366 Vel BY* 08 41 25.8875436000 -53 22 41.467632456   13.63 12.519   11.277 K3e 37 0
194 V* V367 Vel BY* 08 41 39.6670054632 -52 59 34.032238440   14.63 12.613     K7.5e 25 0
195 V* V368 Vel BY* 08 41 57.8482531848 -52 52 13.942332264   14.59 13.76 12.74 12.03 K7e 34 0
196 V* V369 Vel BY* 08 42 04.9310430360 -52 53 53.909397384           M3e 22 0
197 V* V370 Vel BY* 08 42 14.7556955232 -52 56 02.325566004   11.775 10.827 10.541 9.620 G9V 38 0
198 V* V371 Vel BY* 08 42 18.5563649256 -53 01 56.872692444   15.44       M2e 33 0
199 V* V373 Vel BY* 08 43 27.7498717776 -52 57 39.097540332       14.12   ~ 21 0
200 V* V372 Vel BY* 08 43 27.8600657448 -52 57 35.900992260       13.51   ~ 21 0
201 V* V374 Vel BY* 08 43 29.2915419936 -52 41 28.328512308   12.59       K0 20 0
202 V* V375 Vel BY* 08 43 39.7968793296 -52 58 30.934975872           ~ 11 0
203 V* V376 Vel BY* 08 44 05.2223496648 -52 53 17.190402504   11.37 10.75 10.74   G3e: 43 0
204 V* V377 Vel BY* 08 44 26.1593280456 -52 42 32.329984788   12.27 11.51 11.23   G9 43 0
205 V* V379 Vel BY* 08 45 26.9313010080 -52 52 02.105583096   13.79 12.76 12.54   K3e 45 0
206 V* V380 Vel Ro* 08 45 39.1343066088 -52 25 59.548764108   10.35 9.88 9.98   F8 28 0
207 V* HL Cnc BY* 09 01 22.7765982288 +10 43 58.517497164   9.51 8.88     G0 30 0
208 HD 78644 EB* 09 08 17.1487566312 -37 06 53.534162124   8.86 8.22     G3V 42 0
209 V* LQ Hya BY* 09 32 25.5683895648 -11 11 04.692242760 9.316 8.761 7.891 7.288 6.815 K1Vp 459 0
210 HD 82443 BY* 09 32 43.7594578944 +26 59 18.706023348   7.78   6.6   G9V(k) 248 1
211 HD 88230 Er* 10 11 22.1399492383 +49 27 15.251007087 9.23 7.94 6.61 5.36 4.56 K6VeFe-1 462 0
212 V* V544 Car BY* 10 36 18.2442889176 -64 14 56.480572608   16.68       ~ 26 0
213 V* V545 Car BY* 10 36 26.4266205408 -65 00 16.449867648   15.85       ~ 18 0
214 V* V546 Car BY* 10 36 37.9550737536 -64 47 53.793182148   13.84       ~ 30 0
215 V* V547 Car BY* 10 37 22.2685053384 -64 43 19.991947836   16.67       ~ 15 0
216 V* V548 Car BY* 10 37 49.4172637704 -64 00 50.488611804   16.69       ~ 27 0
217 RX J1039.2-6440 * 10 39 14.3243806896 -64 40 49.017454392   17.25 15.72 15.82   ~ 6 0
218 V* V549 Car BY* 10 39 54.9421524216 -63 36 24.392421864   16.43       ~ 11 0
219 V* V550 Car BY* 10 39 55.9705701432 -63 59 30.093460584   13.10       ~ 32 0
220 V* V551 Car BY* 10 40 30.1810788624 -64 42 16.710259644   16.31       ~ 26 0
221 V* V552 Car RR* 10 40 51.3570752544 -64 42 47.828458656   13.418 12.360 12.014 11.033 ~ 22 0
222 V* V553 Car BY* 10 41 00.0596271672 -64 20 00.682777320       15.09   ~ 11 0
223 V* V554 Car BY* 10 41 45.2526301632 -64 28 03.530487972   15.02       ~ 25 0
224 V* V555 Car BY* 10 42 07.0839584184 -64 46 07.839386688   12.40       G 39 0
225 IC 2602 OpC 10 42 27.1 -64 25 34           ~ 675 0
226 V* V556 Car BY* 10 42 28.1546590608 -64 36 12.760041456   17.19       ~ 24 0
227 V* V557 Car BY* 10 42 41.5146144624 -64 21 04.333829688   11.26 12.03     G2V 65 0
228 GSC 08965-00231 * 10 42 56.1040951464 -63 55 51.147555708   12.77 11.90 11.77   G8 28 0
229 V* V558 Car BY* 10 44 06.8106499248 -63 59 35.059923708   11.75       G4 44 0
230 V* V559 Car BY* 10 44 22.5515649000 -64 15 30.116510712   11.61       G0 48 0
231 V* V561 Car BY* 10 44 59.6196312312 -65 02 19.075223040   11.44 10.88 10.54 10.128 G0 50 0
232 V* V562 Car BY* 10 45 18.5497120560 -63 32 26.428432164   15.59       ~ 26 0
233 V* V563 Car BY* 10 45 29.8672627248 -64 25 20.167535208   11.64 10.64 10.53   G5 21 0
234 V* V564 Car BY* 10 46 14.8321188600 -64 02 58.060489884   11.43 10.89     ~ 39 0
235 V* V565 Car BY* 10 46 35.3087927664 -64 03 44.596323900   13.86 12.66 12.38   ~ 19 0
236 V* V566 Car BY* 10 46 51.8026332840 -63 34 15.765895812   14.19       ~ 30 0
237 V* V567 Car BY* 10 48 18.3921107208 -64 09 53.338378428   11.0       G 35 0
238 V* V568 Car BY* 10 48 25.3946019792 -64 22 43.951155672   15.16       ~ 21 0
239 V* V569 Car BY* 10 49 26.2743503520 -64 38 59.971798320   14.72       ~ 18 0
240 V* V570 Car BY* 10 49 48.4012130280 -64 46 28.467956388   12.26 11.32     G9Ve 46 0
241 V* V571 Car BY* 10 49 56.8358871072 -63 48 19.080513396   14.19       ~ 20 0
242 V* DS Leo BY* 11 02 38.3420210088 +21 58 01.700013360 12.246 11.049 9.572 8.638 7.634 M1.0Ve 229 0
243 HD 98712 BY* 11 21 26.66383 -20 27 13.6236           K7V+M2.5Ve 100 1
244 HD 111395 BY* 12 48 47.0481446766 +24 50 24.818642182   6.98   5.8   G5V 187 0
245 * bet Com PM* 13 11 52.3938268062 +27 52 41.462309460 4.92 4.84 4.25 3.77 3.47 F9.5V 908 0
246 * e Vir PM* 13 16 46.5148594512 +09 25 26.960139646   5.81   4.8   G0V 551 1
247 HD 115404 PM* 13 16 51.0514297623 +17 01 01.840901307   7.69 6.66     K2V 280 0
248 HD 118100 Er* 13 34 43.2063495866 -08 20 31.338030204 11.578 10.552 9.372 8.602 7.930 K5Ve 346 0
249 V* EK Dra BY* 14 39 00.2104038120 +64 17 29.979649860   8.243 7.604     G5VFe-0.7CH-1(k) 444 0
250 HD 134319 BY* 15 05 49.9038303360 +64 02 49.941702888   9.05 8.41 8.0   G5V: 128 0
251 * 12 Oph BY* 16 36 21.4496896968 -02 19 28.513024233 7.00 6.55 5.77 5.13 4.74 K1V 487 0
252 HD 152391 PM* 16 52 58.8025159848 -00 01 35.118396116   7.40 6.64     G8.5Vk: 373 0
253 V* V2215 Oph RS* 17 16 13.3624141798 -26 32 46.136563394   7.50 6.34   4.8 K5V 306 0
254 HD 160934 Er* 17 38 39.6170537492 +61 14 16.102424643   11.34 10.15   8.99 K7Ve 102 0
255 V* V2316 Oph BY* 17 45 19.3988522256 +05 47 40.119087444   14.60 13.716   12.696 G6 37 0
256 V* V2317 Oph BY* 17 45 19.6432303334 +05 36 54.755808550   13.49 12.729   11.711 G0 27 0
257 V* V2318 Oph BY* 17 45 25.0724676027 +05 51 38.870504059   14.39 13.716   12.697 G5 38 0
258 Cl* IC 4665 P 94 * 17 45 53.0949964392 +05 36 29.204755884   14.27 14.243   13.149 G8 31 0
259 V* V2319 Oph BY* 17 45 56.7967605336 +05 22 33.440795652   13.417 12.604 12.442 11.682 G0 25 0
260 V* V2321 Oph BY* 17 46 11.9798853179 +05 41 25.876171084   15.43 14.407   13.074 K0 35 0
261 IC 4665 OpC 17 46 13.0 +05 36 54           ~ 372 0
262 V* V2299 Oph Ro* 17 46 25.7092521240 +05 31 09.084906984   13.16 12.342   11.351 F7 22 0
263 V* V2322 Oph BY* 17 46 26.0911413496 +05 49 42.317168720   13.68       F9 26 0
264 V* V2325 Oph BY* 17 47 33.3157647552 +05 31 46.026952428   13.94 13.126   12.107 G4 37 0
265 V* V2326 Oph BY* 17 47 44.0281203687 +05 21 59.234653509   14.43       G5 31 0
266 V* EY Dra BY* 18 16 16.7795336184 +54 10 21.732232332   13.69 11.84     dM1.5e 71 0
267 V* V1075 Her BY* 18 16 24.7671104760 +50 14 16.343063124   9.57 8.92     G5 13 0
268 V* V889 Her BY* 18 34 20.1028767504 +18 41 24.234675864   8.00 7.449   6.720 G2V 139 0
269 MCC 188 SB* 18 55 27.4101872496 +08 24 09.030546324 12.858 11.737 10.194 9.09 7.69 M3Ve 198 0
270 * 15 Sge PM* 20 04 06.2207683221 +17 04 12.676556401   6.390 5.788 5.4   G0V 389 0
271 HD 197481 BY* 20 45 09.5324974119 -31 20 27.237889841   10.05 8.627 9.078 6.593 M1VeBa1 1153 0
272 V* HN Peg BY* 21 44 31.3299461136 +14 46 18.983292600       6.16   G0V+ 515 0
273 V* V383 Lac BY* 22 20 07.0254050808 +49 30 11.767337496   9.42 8.58     K1V 77 0
274 V* GT Peg BY* 22 51 53.5351209551 +31 45 15.192825225       11.281   M3.5Ve 158 0
275 V* TW PsA BY* 22 56 24.0525564918 -31 33 56.030584767   7.58 6.48     K4Ve 292 0
276 HD 217813 BY* 23 03 04.9769970864 +20 55 06.864848184 7.364 7.249 6.616 6.279 5.948 G1V 116 0
277 V* HK Aqr BY* 23 08 19.5510173448 -15 24 35.766079704 13.4 12.282 10.872 9.964 9.019 M0Ve 211 0
278 HD 220140 RS* 23 19 26.6385484104 +79 00 12.673035540   8.43 7.54 7.17 6.76 G9V 148 1
279 V* BS Psc BY* 23 52 24.3672858072 -00 55 59.825843904   11.48 10.76     G7V 22 0
280 [RSP95] 15A X ~ ~   12.67 11.75     ~ 5 0
281 [RSP95] 24A * ~ ~   16.04 14.61     ~ 10 0

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