1997A&A...318..111M

Query : 1997A&A...318..111M

1997A&A...318..111M - Astronomy and Astrophysics, volume 318, 111-133 (1997/2-1)

The ROSAT galactic plane survey: analysis of a low latitude sample area in Cygnus.

MOTCH C., GUILLOUT P., HABERL F., PAKULL M., PIETSCH W. and REINSCH K.

Abstract (from CDS):

We present the analysis of the point source content of a low galactic latitude region selected from the ROSAT all-sky survey. The test field is centered at l=90deg, b=0deg and has an area of 64.5deg2. A total of 128 soft X-ray sources are detected above a maximum likelihood of 8. Catalogue searches and optical follow-up observations show that in this direction of the galactic plane, 85% of the sources brighter than 0.03 PSPC cts/s are identified with active coronae. F-K type stars represent 67%(±13%) of the stellar identifications and M type stars account for 19%(±6%). A small but significant number of X-ray sources are associated with A type stars on the basis of positional coincidence. These results together with those of similar optical campaigns demonstrate that the soft X-ray population of the Milky Way is largely dominated by active stars. We show that the density and distribution in flux and spectral type of the active coronae detected in X-rays are consistent with the picture drawn from current stellar population models and age dependent X-ray luminosity functions. The modelling of this population suggests that most of the stars detected by ROSAT in this direction are younger than 1Gyr. This opens the possibility to extract in a novel way large samples of young stars from the ROSAT all-sky survey. The small number of unidentified sources at low X-ray flux put rather strong constraints on the hypothetical X-ray emission from old neutron stars accreting from the interstellar medium. Our observations clearly rule out models which assume no dynamical heating for this population and a total number of Nns=109 neutron stars in the Galaxy. If accretion on polar caps is the dominant mode then our upper limit may imply Nns≃108. Among the non coronal identifications are three white dwarfs, a Seyfert 1 active nucleus, two early type stars and one cataclysmic variable. We also report the discovery of a Me + WD close binary system with Porb≃12h.

Abstract Copyright: ∼

Journal keyword(s): X-ray general - X-ray stars - stars: activity - stars: neutron - stars: statistics

VizieR on-line data: <Available at CDS (J/A+A/318/111): table11 table12 tables.tex>

Simbad objects: 168

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Number of rows : 168
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 NAME Cyg X BL? 20 30 04.7973633 +40 51 36.002197           ~ 842 1
2 NAME Cyg Complex reg 20 32 +45.0           ~ 600 0
3 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 943 0
4 BWE 2034+4850 BLL 20 35 51.6 +49 01 44           ~ 24 0
5 BD+48 3187 PM* 20 40 38.3633802288 +48 59 55.914650232   10.05 9.52     F8 4 0
6 RX J2041.9+4746 X 20 41 57.45 +47 46 08.8           ~ 2 0
7 TYC 3578-1895-1 * 20 43 13.6549048200 +47 51 38.946014676   11.21 10.92     ~ 2 0
8 GSC 03582-00283 * 20 43 29.2968165312 +50 02 12.921150516   15.33 13.46 12.96   ~ 2 0
9 TYC 3578-1789-1 * 20 43 47.0049978504 +47 27 19.154846340   12.17 11.94 11.71   ~ 2 0
10 RX J2044.6+4758 Ro* 20 44 37.9226186016 +47 58 08.097875148   12.49 11.75 11.53   ~ 5 0
11 RX J2045.1+4805 EB* 20 45 10.3854309960 +48 05 12.209176464   12.45 11.73     ~ 5 0
12 TYC 3578-892-1 * 20 46 43.2547877352 +47 28 32.443528764   13.02 12.20 11.86   ~ 3 0
13 GSC 03582-00586 * 20 48 04.356 +49 03 12.04   12.61 11.78 11.45   ~ 2 0
14 RX J2048.8+4631 X 20 48 48.64 +46 31 09.8           ~ 2 0
15 HD 198638 * 20 49 36.7181098488 +51 18 51.497289108   7.01 6.65     F2 25 0
16 TYC 3587-147-1 * 20 49 39.7948903872 +51 28 34.646603448   12.42 11.55     ~ 2 0
17 GSC 03583-00408 * 20 50 26.1446310480 +49 13 22.161058932   12.36 11.71 12.22   ~ 2 0
18 RX J2050.8+4743 X 20 50 48.56 +47 43 54.7           ~ 2 0
19 RX J2051.8+4741 X 20 51 48.74 +47 41 23.5           ~ 2 0
20 RX J2052.3+4656 X 20 52 19.45 +46 56 39.3           ~ 2 0
21 TYC 3579-1214-1 * 20 52 20.1947696832 +48 43 26.127174720   10.41 9.97     ~ 7 0
22 TYC 3579-1469-1 * 20 52 23.1706614048 +48 19 57.216797472   13.19 11.74     G 5 0
23 RX J2052.6+4703 X 20 52 38.94 +47 03 46.4           ~ 2 0
24 RX J2052.7+4639 WD* 20 52 43.8287290176 +46 39 34.876597068   17.7 17.50 17.1   DO 7 0
25 RX J2052.8+4723 X 20 52 53.05 +47 23 34.6           ~ 2 1
26 RX J2053.2+4951 X 20 53 17.01 +49 51 25.9           ~ 2 0
27 RX J2053.4+4759 X 20 53 28.87 +47 59 14.3           ~ 2 0
28 RX J2054.0+4858 X 20 54 00.97 +48 58 49.6           ~ 2 0
29 TYC 3583-309-1 * 20 54 09.1359654216 +49 42 41.647920012   11.58 10.95     F8V 3 0
30 RX J2054.6+4903 X 20 54 40.01 +49 03 34.3           ~ 2 0
31 RX J2054.6+5120 X 20 54 41.48 +51 20 38.7           ~ 2 0
32 RX J2055.0+5039 X 20 55 01.34 +50 39 32.4           ~ 2 0
33 TYC 3583-1038-1 * 20 55 23.2939152312 +50 25 36.735609108   9.93 9.36     G0V 7 0
34 RX J2055.7+4815 X 20 55 42.91 +48 15 49.7           ~ 2 0
35 GSC 03587-00365 * 20 55 53.0971142208 +50 44 23.143700220   13.48 12.64 12.67   G8V 2 1
36 RX J2056.3+4817 X 20 56 23.14 +48 17 22.5           ~ 2 0
37 BD+49 3420 * 20 56 41.9684258112 +49 40 17.570654508   9.50 8.82     A2 12 0
38 2MASS J20570640+4929330 * 20 57 06.4332813816 +49 29 32.921233224           ~ 2 0
39 TYC 3579-338-1 * 20 57 22.5092152752 +48 13 31.198546848   12.22 11.39     ~ 5 0
40 RX J2057.6+4750 X 20 57 36.51 +47 50 42.0           ~ 2 0
41 RX J2057.7+4752 X 20 57 42.33 +47 52 12.6           ~ 2 0
42 GSC 03575-01843 * 20 58 11.60 +45 52 57.6     10.67     ~ 2 0
43 RX J2058.5+4836 X 20 58 31.16 +48 36 01.5           ~ 2 0
44 RX J2058.7+4845 X 20 58 45.38 +48 45 48.5           ~ 2 0
45 RX J2059.3+5303 ** 20 59 20.3438116465 +53 03 04.816308955   15.713 14.076 13.920   M3.5V 15 0
46 GSC 03579-01518 * 20 59 40.3605721248 +47 31 09.851816496   14.29 13.63 13.58   ~ 2 0
47 * f01 Cyg Be* 20 59 49.5541247496 +47 31 15.363746436 3.77 4.71 4.75 4.62 4.63 B1.5Vnne 501 0
48 GSC 03583-00546 * 20 59 50.1989137944 +49 37 30.539838216   13.53 12.82 12.64   ~ 2 0
49 HD 200177 ** 21 00 06.6110963424 +48 40 45.986347956   7.35 7.34     B9p 58 0
50 TYC 3592-835-1 RR? 21 00 07.8708001032 +48 41 29.556873420   11.39 10.51 10.11   G9V 12 0
51 GSC 03600-00514 * 21 00 20.7264882792 +52 19 10.740247428   14.70 13.48 13.08   M1Ve 2 0
52 RX J2100.3+4810 X 21 00 22.02 +48 10 24.9           ~ 2 0
53 TYC 3600-197-1 * 21 00 37.7894898024 +50 39 29.418612156   11.45 10.85     ~ 2 0
54 BD+44 3670 * 21 00 46.9974222312 +45 30 10.478915676   9.368 8.692     F8 18 0
55 GSC 03600-00242 Em* 21 00 52.0416082944 +52 13 58.531355328   14.060 13.550 13.190   ~ 3 0
56 TYC 3596-1318-1 SB* 21 00 57.2052735768 +48 56 44.921609160   11.49 10.65     K2V 4 0
57 G 231-24 SB* 21 00 59.7901577952 +51 03 14.655062556   14.853   13.096   M2.5V 22 0
58 * 60 Cyg Be* 21 01 10.9277453472 +46 09 20.795190696 4.23 5.226 5.432     B1Ve 202 0
59 HD 200406 ** 21 01 38.7455502960 +47 30 06.947824716   8.45 7.97     K2III+F 33 0
60 HD 200560 BY* 21 02 40.7534911919 +45 53 05.169992088   8.694 7.714 7.1   K2.5V 102 0
61 TYC 3596-374-1 * 21 03 00.7422537384 +48 54 27.904335552   11.21 10.66     G3V 5 0
62 HD 200740 PM* 21 03 26.0902046232 +50 21 06.894996336   7.354 6.364     K0 29 0
63 GSC 03596-00092 * 21 03 38.6669221392 +48 45 50.225295204     10.65 13.78   ~ 2 0
64 RX J210410+49124 * 21 04 10.47 +49 12 57.1     16.00     M4e 4 0
65 RX J2104.2+5015 * 21 04 15.36 +50 15 08.3     15.00     K7e 2 0
66 GSC 03600-00513 * 21 04 44.3382016440 +52 23 25.638062532   12.16 11.41 11.36   G1.5bV 3 0
67 RX J2105.7+4933 X 21 05 45.89 +49 33 36.5           ~ 2 0
68 HD 235440 ** 21 06 00.6899114040 +54 21 54.549186192   9.70 9.13     F8 9 0
69 V* V1550 Cyg Er* 21 06 16.6179529104 +44 37 02.766835200       15.238   ~ 8 0
70 V* V1061 Cyg EB* 21 07 20.5201575864 +52 02 58.418010528   9.78 9.21     F8 81 0
71 NGC 7031 1 * 21 07 37.6049327760 +50 48 59.299518168   11.87 11.21     G1V 5 0
72 RX J2107.8+4932 ** 21 07 52.815744 +49 32 28.88808   11.969 11.034 10.718   G8V 4 0
73 Ass Cyg OB 7 As* 21 08 +47.6           ~ 210 0
74 HD 201543 SB* 21 08 18.0600900192 +53 13 34.535002800   7.57 7.47     A0 13 0
75 RX J210838+49273 * 21 08 37.97 +49 27 34.3     14.10     M2Ve 2 0
76 RX J2108.9+4958 X 21 08 56.32 +49 58 07.8           ~ 2 0
77 GSC 03592-05781 * 21 09 17.8591669080 +48 10 13.146074472     11.40 11.77   K7V 3 0
78 TYC 3600-175-1 * 21 09 22.1888859624 +51 37 50.249706672   10.38 9.72     G3V 5 0
79 BD+47 3315 * 21 09 54.7941276504 +48 09 16.180902324   9.35 9.00     A5 6 0
80 HD 201834 * 21 10 15.5733223584 +53 33 47.162825784   5.630 5.747     B9III 53 0
81 RX J2110.3+4832 X 21 10 19.49 +48 32 31.1           ~ 2 0
82 RX J2110.5+5244 X 21 10 30.63 +52 44 23.8           ~ 2 0
83 TYC 3596-1415-1 * 21 10 32.4834786000 +49 13 25.856076324   11.17 10.62     ~ 2 0
84 V* V1500 Cyg No* 21 11 36.5809818696 +48 09 01.952490204           ~ 794 0
85 RX J2111.8+4942 X 21 11 53.70 +49 42 33.3           ~ 2 0
86 GD 394 WD* 21 12 44.0371201584 +50 06 17.887239540 11.70 12.85 13.09     DA1.3 179 1
87 TYC 3953-355-1 * 21 12 56.2264917264 +53 14 30.594246576   10.76 10.22     ~ 2 0
88 TYC 3593-3505-1 * 21 13 04.4539657032 +48 34 23.246353884   12.13 11.35     G1V 4 0
89 RX J211323+51400 * 21 13 23.70 +51 40 06.5     16.50     M4Ve 2 0
90 RX J2114.1+4840 X 21 14 09.88 +48 40 27.9     11.36     ~ 2 0
91 RX J2115.4+4437 Ro* 21 15 23.9670426240 +44 37 42.542162832   11.960 10.982 10.644   K0IV 6 0
92 RX J2116.0+4827 * 21 16 03.4926374976 +48 27 00.236053188           ~ 2 0
93 RX J2116.0+5254 X 21 16 03.91 +52 54 56.1           ~ 2 0
94 2MASS J21163725+4645158 * 21 16 37.2521917150 +46 45 15.889978296     15.50     M5Ve 3 0
95 TYC 3953-1223-1 * 21 17 11.7525546456 +52 40 41.264110380   11.42 10.86     ~ 2 0
96 Lan 121 WD* 21 17 17.6881489512 +50 44 06.029957508           DA 10 0
97 RX J2117.3+5044 ** 21 17 17.772216 +50 44 06.12024           DA+K/M 7 0
98 RX J2117.4+5152 X 21 17 25.10 +51 52 20.1           ~ 2 0
99 GSC 03953-01075 Y*? 21 17 31.8778629864 +52 43 07.174531488   13.91 13.00 12.87   ~ 4 0
100 GSC 03601-00450 * 21 17 32.2137378624 +51 27 15.101711676   13.96 12.94 12.75   M0Ve 2 0
101 TYC 3181-914-1 SB* 21 17 35.4674381496 +43 30 52.179993180   11.25 10.50     F8V 5 0
102 RX J2117.7+5139 X 21 17 46.61 +51 39 05.4           ~ 3 0
103 HD 203028 * 21 17 52.7090536272 +51 12 26.243653464 8.650 8.590 8.360     A2 9 0
104 * 68 Cyg SB* 21 18 27.1862219256 +43 56 45.399147864 4.05 4.99 5.00     O7.5IIIn((f)) 374 0
105 GSC 03953-01190 ** 21 18 30.9657467784 +52 47 40.084443672   11.711 11.188 11.113   ~ 2 0
106 RX J2118.6+5039 X 21 18 40.10 +50 39 06.4           ~ 2 0
107 HD 203136 * 21 18 40.3832943744 +50 10 56.792571384   8.65 7.73     K0III 25 0
108 TYC 3601-1235-1 * 21 18 59.2344684600 +52 07 03.504432864   12.40 11.79 11.64   G1V 3 0
109 RX J2119.5+4351 X 21 19 31.82 +43 51 51.5           ~ 2 0
110 TYC 3601-1367-1 * 21 19 54.4876800888 +52 27 46.097628912   13.26 12.34     ~ 3 0
111 TYC 3601-440-1 * 21 20 17.4015929496 +51 27 44.416983996   12.10 11.59     ~ 2 0
112 HD 203418 PM* 21 20 25.7725295040 +47 33 26.953178652   9.68 8.64 8.83   K3V 13 0
113 RX J2120.8+5209 X 21 20 49.63 +52 09 27.7           ~ 2 0
114 RX J2120.9+4636 Ro* 21 20 55.4169788256 +46 36 12.239663220   10.99 10.44     G1.5V 8 0
115 RX J2121.0+5049 X 21 21 02.19 +50 49 57.6           ~ 2 0
116 RX J2121.1+4907 X 21 21 07.66 +49 07 37.5           ~ 2 0
117 GSC 03593-03030 * 21 21 32.5522843752 +47 32 50.615440656   15.27 13.88 13.38   M0Ve 2 0
118 RX J2121.5+4951 X 21 21 34.26 +49 51 33.6           ~ 2 0
119 RX J2121.5+4317 X 21 21 35.61 +43 17 29.4           ~ 2 0
120 HD 235498 * 21 21 47.4725834184 +50 49 31.843567164   9.73 9.62     A0 10 0
121 TYC 3601-693-1 * 21 21 52.3238363928 +51 35 17.893072680   12.12 11.52     ~ 2 0
122 RX J2122.0+5059 X 21 22 02.40 +50 59 18.7           ~ 2 0
123 GSC 03593-05051 * 21 22 20.705 +47 30 43.10   15.55 13.98 13.48   M4.5Ve 2 0
124 RX J2122.4+4709 X 21 22 24.16 +47 09 17.9           ~ 2 0
125 ATO J320.6116+50.3990 Y*? 21 22 26.7855399384 +50 23 56.672087676   12.63 11.78 11.53   G9V 4 0
126 TYC 3598-927-1 * 21 22 37.3586426712 +48 56 19.055714352   12.15 11.38 11.49   ~ 2 0
127 RX J2122.6+4956 X 21 22 40.00 +49 56 04.0           ~ 2 1
128 RX J2122.9+4941 X 21 22 58.94 +49 41 00.9           ~ 2 0
129 V* V2154 Cyg EB* 21 23 08.3020068216 +48 31 08.076204696   8.23 7.83     F0 45 0
130 BD+49 3512 Ro* 21 23 12.5022700704 +50 21 47.490622920   10.03 9.39     ~ 5 0
131 RX J2123.2+5057 X 21 23 14.80 +50 57 09.5           ~ 2 0
132 TYC 3590-2325-1 * 21 23 34.6849158936 +46 21 39.249417924   12.81 11.55     K4V 4 0
133 RX J2123.7+4636 X 21 23 44.89 +46 36 59.4           ~ 2 0
134 RX J212417+50594 * 21 24 18.31 +50 59 52.4     13.30     K7Ve 2 0
135 RX J2124.5+5133 X 21 24 32.10 +51 33 57.5           ~ 2 0
136 TYC 3594-2027-1 SB* 21 24 42.6411248616 +47 14 41.958605760   11.34 10.66     ~ 2 0
137 TYC 3590-1727-1 * 21 24 43.6923866328 +46 39 41.660463096   12.38 11.69     ~ 4 0
138 RX J2125.2+4942 PM* 21 25 12.1394479776 +49 42 21.811271832   11.97 10.87     K4V 7 0
139 HD 204153 PM* 21 25 19.5488561064 +46 42 51.628763376   5.907 5.580 5.4   F0V 72 0
140 TYC 3594-1755-1 * 21 26 23.5884842280 +46 54 30.627966168   11.63 10.89     ~ 3 0
141 RX J2126.9+4636 X 21 26 58.87 +46 36 43.9           ~ 2 0
142 RX J2127.1+4801 X 21 27 08.86 +48 01 20.9           ~ 2 0
143 RX J2127.3+5121 X 21 27 19.87 +51 21 56.2     11.46     ~ 2 0
144 RX J2128.4+4900 X 21 28 24.79 +49 00 39.3           ~ 2 0
145 RX J2128.5+4626 X 21 28 30.05 +46 26 55.3           ~ 2 0
146 GSC 03594-00075 * 21 28 40.7283730656 +46 53 55.954376160   13.59 12.47 11.77   K5V 2 0
147 2MASS J21284626+4409141 * 21 28 46.2716888160 +44 09 13.787921952           ~ 2 0
148 RX J2129.2+4604 X 21 29 15.28 +46 04 45.2           ~ 2 0
149 Cl* NGC 7092 PLAT 2137 V* 21 30 03.8755364424 +47 40 24.976573680   12.83 12.16     K4V 5 0
150 RX J213012+49012 * 21 30 11.83 +49 01 33.0     14.11     M5Ve 2 0
151 HD 204906 * 21 30 18.0478012656 +47 10 18.971897088 8.950 8.940 8.450     F5 23 0
152 RX J2130.6+4710 XB* 21 30 18.4670033976 +47 10 07.403693592           DA+M3.5/4Ve 32 0
153 Cl* NGC 7092 PLAT 2930 * 21 30 43.5247308936 +49 18 59.709831372   12.84 12.36     G2: 4 0
154 BD+47 3439 SB* 21 30 47.997552 +48 27 25.49232   9.50 9.01 8.83   K0 21 0
155 RX J2130.8+4842 X 21 30 51.1 +48 42 35           ~ 2 0
156 RX J2131.2+4812 X 21 31 12.24 +48 12 14.0           ~ 2 0
157 RX J2131.2+4533 X 21 31 17.47 +45 33 14.4           ~ 2 0
158 V* V1727 Cyg LXB 21 31 26.2133156448 +47 17 24.512055396 16.75 17.05 16.4     ~ 240 0
159 NGC 7092 OpC 21 31 33.4 +48 14 49           ~ 223 0
160 RX J2132.5+4849 X 21 32 33.83 +48 49 41.3           ~ 2 0
161 RX J2133.3+4726 X 21 33 22.11 +47 26 34.1           ~ 2 0
162 * rho Cyg PM* 21 33 58.8530450102 +45 35 30.620055459 5.47 4.91 4.02 3.31 2.81 G8IIIFe-0.5 198 0
163 TYC 3591-1945-1 * 21 34 05.5751092152 +45 25 33.887678592   12.24 11.38 11.26   G3V 2 0
164 Cl* NGC 7092 PLAT 5991 * 21 34 16.9885056048 +49 11 21.377896296   14.11 12.62     ~ 3 0
165 TYC 3591-2803-1 * 21 35 38.4705983760 +45 23 09.379595976   12.06 11.61 11.56   F9V 2 0
166 2MASS J21355401+4728218 Sy1 21 35 54.0201149472 +47 28 21.891328284     16.30 13.2   ~ 55 0
167 RX J2136.6+4910 * 21 36 38.7580152120 +49 10 47.034008112           ~ 5 1
168 RX J2137.6+4916 X 21 37 38.54 +49 16 09.7           ~ 2 0

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