1998ApJ...506..347B


Query : 1998ApJ...506..347B

1998ApJ...506..347B - Astrophys. J., 506, 347-359 (1998/October-2)

Stellar activity in coeval open clusters: Praesepe and the Hyades.

BARRADO Y NAVASCUES D., STAUFFER J.R. and RANDICH S.

Abstract (from CDS):

Randich & Schmitt found that the coronal activity of solar-type and low-mass stars in Praesepe is significantly lower than that of stars in the Hyades cluster. This result is quite surprising, since the Hyades and Praesepe have approximately the same age and metallicity and are often thought to have originated in the same giant molecular cloud complex. We have carried out several tests in order to find a possible explanation for this result. We have measured radial velocities of two groups of Praesepe stars (a dF-dK sample and a dM sample) and have measured Hα as a chromospheric activity index for the dM sample. Based on analyses of these data, we conclude that the Praesepe catalog used in the X-ray analysis does not contain a significant number of nonmembers and, thus, that membership problems do not seem to be the cause of the Randich & Schmitt result. The comparison of the Hα equivalent widths for the M dwarfs in Praesepe with those in the Hyades indicates that, at least for stars in this mass range, the Praesepe stars are as active or more active than their Hyades counterparts. The similarity of chromospheric emission allows us to reject differences in the rotational velocity distribution as the origin of the dissimilar Lx luminosity functions. We have also analyzed a few ROSAT PSPC pointings of Praesepe in order to obtain a new and independent estimate of the X-ray luminosities and upper limits for a small sample of Praesepe members. This analysis suggests that the previous ROSAT PSPC analysis produced slightly optimistic X-ray upper limits; however, the differences between the old and new upper limits are not large enough to explain the dichotomy in the X-ray properties of Praesepe and the Hyades. Therefore, our examination of the available data does not provide a clear reason to explain why the X-ray luminosity functions of the two clusters are different. Part of the explanation could be found in the binaries. Speculatively, these clusters could have different orbital period distributions, with more short-period binaries among the Hyades, which would show larger coronal activity.

Abstract Copyright:

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: Name: Hyades - Galaxy: Open Clusters and Associations: Individual: Name: Praesepe - Stars: Activity - Stars: Chromospheres - Stars: Late-Type - X-Rays: Stars

CDS comments: Table 3: stars 'I563' and 'II626' not identified.

Simbad objects: 151

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Number of rows : 151
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2793 0
2 Cl* NGC 2632 HSHJ 14 * 08 31 16.9277135868 +19 21 18.970883829           M3V 12 0
3 Cl* NGC 2632 HSHJ 16 LM* 08 31 40.8997970315 +18 29 43.052296617           M2.8 10 0
4 Cl* NGC 2632 HSHJ 23 LM* 08 32 18.8970860233 +19 03 08.666486958           M3.0 13 0
5 Cl* NGC 2632 HSHJ 25 * 08 32 46.7956033993 +19 59 51.825302113           M3.4 15 0
6 Cl* NGC 2632 HSHJ 26 Er* 08 32 48.7761111234 +18 40 40.748289693           M3.5 13 0
7 Cl* NGC 2632 JS 669 * 08 33 24.6221944473 +19 52 57.801836075   21.25 18.24     M3.7 17 0
8 Cl* NGC 2632 JC 21 Er* 08 33 27.0043316726 +19 20 28.751198533   17.45 15.43     M1.4 14 0
9 Cl* NGC 2632 HSHJ 43 Er* 08 33 33.9436811265 +20 04 25.589526881           M2.3 16 0
10 Cl* NGC 2632 HSHJ 48 * 08 33 45.3 +19 39 16           ~ 2 0
11 Cl* NGC 2632 JC 27 * 08 33 50.7607431338 +19 46 58.622459526   18.01 15.75     M0.5 12 0
12 Cl* NGC 2632 JC 31 * 08 34 02.4570866099 +19 19 21.962073555   19.37 16.17     M2.3 11 0
13 Cl* NGC 2632 HSHJ 60 LM* 08 34 39.7001810641 +19 08 12.806982460           M4V 13 0
14 HIP 42106 Ro* 08 34 59.6263910082 +21 05 49.183448114   11.49 11.01     F8.9 26 0
15 Cl* NGC 2632 JS 83 * 08 35 14.5425586816 +20 47 41.930325141   11.32 10.71     ~ 2 0
16 Cl* NGC 2632 HSHJ 70 * 08 35 14.7713557766 +19 16 31.769688612           M2.9 12 0
17 Cl* NGC 2632 JS 84 * 08 35 16.9518546189 +19 54 53.359108129   19.56 17.03     M1.8 12 0
18 Cl* NGC 2632 JS 87 LM* 08 35 21.6912548612 +18 29 34.193278536   19.24 17.09     M1.8 12 0
19 BD+20 2119 SB* 08 35 28.0467862984 +20 11 46.829408639   10.96 10.48     F8 17 0
20 Cl* NGC 2632 JC 48 * 08 35 33.8701309261 +18 55 47.503166308   16.79 15.04     M0.2 15 0
21 Cl* NGC 2632 JC 49 * 08 35 35.7082624597 +18 59 44.599856753   17.19 15.32     K7.9 12 0
22 Cl* NGC 2632 JS 94 Er* 08 35 39.6724127115 +19 07 36.358912189   19.93 17.28     M3.1 17 0
23 Cl* NGC 2632 JS 95 Er* 08 35 40.1507582476 +18 42 28.351552587   19.95 17.34     M3.3 18 0
24 Cl* NGC 2632 HSHJ 87 LM* 08 35 47.2237077744 +18 08 29.902943434           M5V 15 0
25 Cl* NGC 2632 JS 99 * 08 35 50.8244461983 +18 53 43.599217747   19.93 17.20     ~ 8 0
26 Cl* NGC 2632 JS 103 Ro* 08 35 54.5496151997 +18 08 57.662152423   11.39 10.82     F7.2 16 0
27 Cl* NGC 2632 JS 102 Er* 08 35 56.9483008235 +20 49 34.733256364   12.64 11.85     K0V: 23 0
28 Cl* NGC 2632 HSHJ 94 * 08 35 59.1895608375 +18 18 29.637598204           M1.9 10 0
29 Cl* NGC 2632 JS 105 Er* 08 36 00.4740690951 +17 58 33.396905928   19.19 16.84     M1.9 16 0
30 Cl* NGC 2632 JS 111 Er* 08 36 08.9531346682 +19 09 30.906267720   20.41 17.54     M3.0 17 0
31 Cl* NGC 2632 JC 58 * 08 36 11.4268436904 +19 52 40.284410997   15.57       M0.0 20 0
32 Cl* NGC 2632 JS 124 Er* 08 36 19.0186199731 +18 55 08.542511154   19.46 16.97     M2.3 16 0
33 Cl* NGC 2632 JS 123 LM* 08 36 19.1548168376 +19 53 54.842151483   20.17 17.56     M3.0 20 0
34 Cl* NGC 2632 JS 126 * 08 36 21.8142904458 +20 12 19.680856013   19.55 16.98     M1.9 17 0
35 BD+19 2045 SB* 08 36 29.8525487287 +18 57 56.988077325   9.86 9.50     F6V 33 0
36 Cl* NGC 2632 JC 66 * 08 36 33.3840107030 +19 54 54.388660874   18.41 16.27     M1.8 19 0
37 Cl* NGC 2632 JS 146 Ro* 08 36 45.7210510732 +20 07 26.212748162   12.380 11.613     G5.0 26 0
38 Cl* NGC 2632 S 3 * 08 36 46.5744132205 +19 45 44.138767870   12.19 11.39     G 11 0
39 V* CD Cnc Er* 08 36 48.9553032734 +19 18 59.334001170           M1.8 23 0
40 Cl* NGC 2632 JS 158 * 08 36 55.9797698706 +19 35 56.998853521   19.55 17.19     M2.2 15 0
41 HD 73081 SB* 08 37 02.0321035176 +19 36 17.225734590   9.649 9.560     F6V 45 0
42 Cl* NGC 2632 JS 163 Er* 08 37 02.6779592757 +19 19 42.477267650   19.37 16.84     M2.1 14 0
43 Cl* NGC 2632 S 12 Ro* 08 37 11.4889391186 +19 48 13.245790204   12.008 11.286     G 38 0
44 Cl* NGC 2632 S 11 SB* 08 37 11.6690666846 +20 17 04.914287010   11.6 11.1     G0V 18 0
45 Cl* NGC 2632 S 13 Ro* 08 37 18.2937840989 +19 41 56.400738531   12.181 11.424     G5V 27 0
46 Cl* NGC 2632 S 14 Ro* 08 37 22.2266583174 +20 10 37.238283429   12.077 11.378     G 32 0
47 K2-95 * 08 37 27.0563002037 +18 58 36.022931591   19.86 17.27     M3V 38 0
48 Cl* NGC 2632 S 16 Ro* 08 37 27.5518646804 +19 37 03.268150754   12.416 11.616     G8V 37 0
49 BD+20 2130 * 08 37 27.9442302190 +19 33 45.177039318   10.35 9.79     F6V 41 0
50 Cl* NGC 2632 HSHJ 165 LM* 08 37 29.4103708517 +18 41 35.532222966           M2.6 11 0
51 Cl* NGC 2632 JC 104 * 08 37 32.2247034295 +18 53 02.334741320   18.22 16.13     M1.4 17 0
52 Cl* NGC 2632 JC 103 Er* 08 37 32.4312320906 +19 31 17.997294220   18.59 16.27     M1.9 18 0
53 Cl* NGC 2632 JC 106 Ro* 08 37 33.0781550601 +18 39 15.607235648   11.249 10.668     G0.0 28 0
54 Cl* NGC 2632 JC 105 Er* 08 37 33.7157187106 +19 18 39.564361499   18.06 16.59     M2.1 13 0
55 Cl* NGC 2632 JS 192 LM* 08 37 34.9712148415 +18 56 07.821897327   19.90 17.52     ~ 10 0
56 BD+19 2052 SB* 08 37 42.3625026049 +19 08 01.577699242   10.29 9.88     F4V 37 0
57 Cl* NGC 2632 JC 112 Ro* 08 37 46.4122301649 +19 35 57.470767494   13.252 12.305     K1V 35 0
58 Cl* NGC 2632 S 25 Ro* 08 37 46.6102814233 +19 26 18.049036568   11.243 10.635     F9V 45 0
59 Cl* NGC 2632 S 27 Ro* 08 37 49.9832932028 +19 53 28.878062896   11.65 11.27 11.25   G8V 24 0
60 Cl* NGC 2632 S 29 Ro* 08 37 52.0886888504 +19 59 13.859077789   11.952 11.242     G5V 41 0
61 Cl* NGC 2632 JC 118 Ro* 08 37 57.0348289240 +19 14 10.373925430   12.632 11.829     G8V 35 0
62 Cl* NGC 2632 JS 211 Ro* 08 38 07.5813260133 +19 59 16.321591952   12.969 12.061     K1.2 26 0
63 Cl* NGC 2632 JS 212 Ro* 08 38 08.0838515345 +20 26 22.341108534   12.432 11.684     G6.5 29 0
64 Cl* NGC 2632 S 38 Ro* 08 38 14.2625127906 +19 21 55.335723069   11.605 10.897     G5V 32 0
65 Cl* NGC 2632 JS 220 Ro* 08 38 14.9763220963 +20 34 04.158072141   11.89 10.87 11.32   G4.5 24 0
66 K2-100 Ro* 08 38 24.3004849747 +20 06 21.828303951   11.085 10.521     G0V 72 0
67 Cl* NGC 2632 S 51 SB* 08 38 50.0069496356 +20 04 03.537549213   11.40 10.80     G0V 39 0
68 BD+20 2140 SB* 08 39 02.8285920625 +19 43 29.006768222   9.79 9.43     F7V 44 0
69 HD 73429 * 08 39 05.2333469090 +20 07 01.803225850   9.81 9.41     F5V 47 0
70 Cl* NGC 2632 RG 329 * 08 39 10.1434300577 +19 40 42.342720531   9.83 9.41     F4V 34 0
71 HIP 42436 Ro* 08 39 10.9672015720 +18 10 33.559763418   10.86 10.27     F7.5 25 0
72 Cl* NGC 2632 JC 152 Ro* 08 39 12.1727287690 +19 06 56.207071559   11.129 10.568     F9V 47 0
73 Cl* NGC 2632 S 70 Ro* 08 39 14.9923119763 +20 12 38.779419850   11.54 10.86 11.19   G5V 31 0
74 Cl* NGC 2632 ANM 748 * 08 39 16.6434210931 +17 27 46.534882328   11.98 12.11     ~ 15 0
75 BD+19 2061 Ro* 08 39 24.9776901053 +19 27 33.643518853   11.066 10.461     F7V 60 0
76 BD+20 2146 Ro* 08 39 30.4202326336 +20 04 08.580399348   10.892 10.260     F8V 39 0
77 Cl* NGC 2632 S 79 Ro* 08 39 35.5396439902 +18 52 36.752681955   11.282 10.695     G 32 0
78 Cl* NGC 2632 S 83 Ro* 08 39 45.7491015486 +19 22 01.146480509   11.257 10.640     G0 61 0
79 Cl* NGC 2632 KW 213 Er* 08 39 50.8364574913 +19 33 02.073090648   12.61 11.84     G6.1 29 0
80 Cl* NGC 2632 S 87 Ro* 08 39 52.3360939942 +19 18 45.498130803   10.742 10.217     F7V 48 0
81 HD 73641 * 08 39 58.0672424750 +19 12 05.871841674   9.92 9.54     F3V 66 0
82 Cl* NGC 2632 KW 236 Ro* 08 39 59.7893206224 +19 34 00.179973341   12.880 11.886     K 27 0
83 Cl* NGC 2632 JC 177 Ro* 08 39 59.9820170030 +19 34 40.475728453   13.861 12.855     K2.3 32 0
84 Cl* NGC 2632 S 97 Ro* 08 40 00.6246903515 +19 48 23.593794356   10.824 10.271     F6V 42 0
85 V* TX Cnc EB* 08 40 01.7039481625 +18 59 59.422657649   10.71 9.97 9.88   G0-G1V 214 0
86 Cl* NGC 2632 JC 187 Pu* 08 40 05.7147090719 +19 01 30.667177497   13.720 12.706 12.150   K1V 32 0
87 Cl* NGC 2632 S 105 SB* 08 40 06.2769578658 +19 27 14.754684506   10.82 10.25     F6V 25 0
88 Cl* NGC 2632 S 104 Ro* 08 40 06.3566790841 +19 18 26.510190376   11.761 10.980     G8V 37 0
89 Cl* NGC 2632 JC 190 Ro* 08 40 09.6806090106 +19 37 17.100035501   12.808 11.973     G9V 42 0
90 K2-102 Ro* 08 40 13.4532692251 +19 46 43.712129004   14.318 13.200     K3V 41 0
91 BD+20 2162 Ro* 08 40 17.5840728828 +19 47 14.991353908   10.551 9.941     F8V 39 0
92 BD+20 2164 Ro* 08 40 22.3141698509 +20 06 24.324675411   10.42 9.98 9.97   F2III 41 0
93 Cl* NGC 2632 S 118 Ro* 08 40 22.7160407772 +19 27 53.155632949   11.303 10.673     F7.2 46 0
94 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1330 0
95 Cl* NGC 2632 S 128 Ro* 08 40 27.4367933447 +19 16 40.921205464   11.822 11.148     G3V 40 0
96 Cl* NGC 2632 S 126 Ro* 08 40 28.6409583978 +20 18 44.817741500   12.432 11.604     K 23 0
97 Cl* NGC 2632 S 131 Ro* 08 40 31.6863515690 +19 51 01.014807219   12.402 11.609     G9V 34 0
98 Cl* NGC 2632 S 129 Ro* 08 40 31.8436758171 +20 12 06.021092764   12.201 11.472     G5V 36 0
99 Cl* NGC 2632 JC 215 Ro* 08 40 33.4640998367 +19 38 00.937412386   13.094 12.198     K0.8 41 0
100 Cl* NGC 2632 JC 216 Ro* 08 40 33.5988622179 +18 40 28.164387562   12.335 11.596     G5.4 25 0
101 Cl* NGC 2632 S 134 Ro* 08 40 39.9179794378 +19 40 09.189904738   11.580 10.859     G3V 39 0
102 Cl* NGC 2632 S 137 Ro* 08 40 41.8999044145 +19 13 25.360248780   11.205 10.567     G0V 35 0
103 Cl* NGC 2632 S 138 Ro* 08 40 42.4810997427 +19 33 57.626579766   12.063 11.331     G4V 55 0
104 BD+19 2074 * 08 40 46.0856797986 +19 18 34.561499324   9.967 9.50     F4V 51 0
105 Cl* NGC 2632 S 145 Ro* 08 40 47.6138801231 +18 54 11.924928454   12.159 11.426     G6.8 33 0
106 Cl* NGC 2632 S 143 Ro* 08 40 47.9838322902 +19 39 32.155055675   11.757 10.991     G2V 41 0
107 Cl* NGC 2632 S 144 Ro* 08 40 48.3236371874 +19 55 18.907893019   11.707 11.012     G2V 50 0
108 Cl* NGC 2632 S 148 Ro* 08 40 52.5239899163 +19 28 59.565213096   10.839 10.267     F7V 47 0
109 Cl* NGC 2632 JC 230 Ro* 08 40 56.6913856057 +19 44 05.185600806   13.095 12.198     K0.5 31 0
110 Cl* NGC 2632 JS 404 * 08 41 02.6229577666 +20 27 27.766089552   13.24 12.35     G8.5 20 0
111 BD+19 2076 SB* 08 41 07.3227407567 +19 04 16.192269918   10.82 10.18     F7V 39 0
112 BD+19 2077 Ro* 08 41 09.6035490252 +19 51 18.658967774   11.361 10.631     G7.6 45 0
113 BD+20 2176 Ro* 08 41 10.0217721604 +19 30 32.064558222   10.613 10.080     F7V 50 0
114 Cl* NGC 2632 S 155 Ro* 08 41 10.3085858520 +19 49 07.003931605   12.268 11.495     G6.6 50 0
115 Cl* NGC 2632 JS 409 * 08 41 11.0530843672 +20 49 57.894539378   12.65 11.92     K0V: 11 0
116 BD+20 2181 Ro* 08 41 25.8431960416 +19 56 36.849175368   11.342 10.687     G0V 57 0
117 Cl* NGC 2632 S 169 Ro* 08 41 28.6843673630 +19 44 48.138561531   11.605 10.933     G1V 39 0
118 Cl* NGC 2632 KW 401 Ro* 08 41 30.7064901187 +18 52 18.721545470   13.649 12.727     K3.1 25 0
119 Cl* NGC 2632 JC 258 Ro* 08 41 31.5380708931 +18 30 02.227985014   10.89 10.13     F5 23 0
120 Cl* NGC 2632 S 171 Ro* 08 41 33.8312379402 +19 58 08.722719956   12.503 11.678     G6.7 29 0
121 BD+20 2183 SB* 08 41 42.2954949252 +19 39 37.963331268   10.02 9.60     F6V 46 0
122 Cl* NGC 2632 JC 263 Ro* 08 41 43.6884513603 +19 57 43.724045701   13.264 12.333     K1V 33 0
123 BD+20 2184 Ro* 08 41 43.8163614906 +20 13 36.755425121   10.988 10.431     F7 64 1
124 BD+19 2081 * 08 41 45.4930631280 +19 16 02.243749236   10.62 10.16     F7V 44 0
125 Cl* NGC 2632 JS 461 * 08 41 51.9883579340 +20 10 01.152320202   12.89 12.04     K0.0 28 0
126 Cl* NGC 2632 S 184 Pu* 08 41 54.3796292489 +19 15 26.595053045   12.104 11.354 11.053   G8V 38 0
127 Cl* NGC 2632 S 186 Pu* 08 41 55.8711147462 +19 41 22.849768594   11.718 11.006 10.796   G2V 36 0
128 Cl* NGC 2632 JS 465 Ro* 08 41 59.2434080443 +20 55 07.164729261   11.83 11.43     G5V: 18 0
129 BD+20 2189 ** 08 42 20.1424153427 +20 02 11.754823171   10.26 9.77     F6V 39 0
130 Cl* NGC 2632 JS 737 * 08 42 22.6872919492 +20 07 06.327150958   12.99 12.10     ~ 13 0
131 BD+18 2020 * 08 42 36.8048222016 +18 23 19.839077775   10.536 10.079     G0V: 16 0
132 Cl* NGC 2632 JS 496 Ro* 08 42 40.2089773675 +19 07 59.112511335   12.976 12.111     K0.1 28 0
133 BD+20 2192 * 08 42 40.7206133706 +19 32 35.456664156   10.24 9.87     F2III 35 0
134 Cl* NGC 2632 S 199 Ro* 08 42 42.4975253570 +19 05 58.952742393   12.359 11.596     G5.8 32 0
135 BD+20 2193 * 08 42 44.4154522305 +19 34 47.872845056   10.13 9.73     F6V 37 0
136 Cl* NGC 2632 S 203 Ro* 08 43 00.5481991364 +20 20 16.104266708   12.147 11.384     G5V 29 0
137 BD+19 2087 SB* 08 43 05.9394066462 +19 26 15.290533993   10.52 9.93     F8V 39 0
138 HD 74186 SB* 08 43 07.0514349197 +19 04 06.083990561   10.09 9.56     F8V 41 0
139 Cl* NGC 2632 S 209 Ro* 08 43 10.7666367207 +19 31 34.634098712   12.583 11.769     G6.8 33 0
140 Cl* NGC 2632 S 213 Ro* 08 43 20.1944331707 +19 46 08.541986218   11.415 10.756     G0V 38 0
141 BD+22 1980 SB* 08 43 22.5711351107 +21 40 18.102070471   11.24 10.52     G3.7 28 0
142 BD+20 2196 SB* 08 43 35.5358030540 +20 11 22.502920569   10.59 10.03     F6V 40 0
143 BD+19 2089 SB* 08 43 48.1501164294 +18 48 02.697924159   10.66 10.19     F8 32 0
144 BD+20 2201 Ro* 08 44 37.0329192367 +19 42 39.161354549   11.06 10.43     G0 21 0
145 BD+20 2204 Ro* 08 45 04.2275114225 +20 21 27.875170712   10.865 10.296     F5 26 0
146 Cl* NGC 2632 JS 588 Ro* 08 45 13.0607677288 +19 41 12.695062150   11.55 10.74     G5V: 19 0
147 BD+22 1985 Ro* 08 45 27.9426871480 +21 39 12.923433794   11.16 10.52     F6.6 32 0
148 Cl* NGC 2632 JS 612 * 08 45 50.5725174262 +19 37 05.966852225   11.71 11.19     ~ 4 0
149 Cl* NGC 2632 JS 638 Ro* 08 46 47.3216935814 +19 38 41.025448096   11.303 10.701     G8V: 20 0
150 V* FV Cnc CV* 08 48 01.7387992440 +18 40 37.644471641   11.12 10.60     G 36 0
151 Cl* NGC 2632 JS 660 Ro* 08 48 27.8391534351 +18 20 43.895714131   12.05 11.34     G5.3 17 0

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