2000A&A...353..177M

Query : 2000A&A...353..177M

2000A&A...353..177M - Astronomy and Astrophysics, volume 353177-185 (2000/1-1)

A systematic analysis of X-ray variability of dM stars.

MARINO A., MICELA G. and PERES G.

Abstract (from CDS):

We have systematically analyzed X-ray variability of dM stars. Our data base is the sample of all dM stars listed in the CNS3 (Gliese & Jahreiss, 1991NSC3..C......0G) catalog which have been observed with the ROSAT PSPC. Our data sample includes 86 pointed observations of 55 distinct stars or multiple systems. A large fraction of stars shows significant variations, regardless of their quiescent flux. Variability is detected on all observable time scales. The amplitudes of these variations are independent of both stellar X-ray and visual luminosity. Compared to solar X-ray variability properties our results suggest that the amplitude distribution of X-ray variability in dM stars is consistent with the analogous distribution for solar flares. We discuss the effect of variability on the spread observed in the X-ray luminosity function of M stars. The comparison of our data with those obtained with Einstein IPC shows that variations on time scales shorter than a few month are more common than long term variations comparable to, e.g., the 11 years solar cycle.

Abstract Copyright: ∼

Journal keyword(s): stars: coronae - stars: late-type - X-rays: stars - Galaxy: solar neighbourhood

CDS comments: Table 1: CNS 783 = GJ 3294, CNS 1673 = GJ 3618.

Simbad objects: 64

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Number of rows : 64
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 225213 PM* 00 05 24.4284351777 -37 21 26.507931505 11.074 10.022 8.562 7.589 6.432 M2V 229 0
2 Wolf 1056 PM* 00 38 59.0443396237 +30 36 58.387586417   12.60   10.6   M2.5V 118 0
3 CD-28 302 SB* 00 58 27.9358715189 -27 51 25.393748503 14.638 13.382 11.801 10.663 9.202 M3V 78 0
4 V* YZ Cet PM* 01 12 30.6368826382 -16 59 56.358011559 15.315 13.885 12.074 10.696 8.938 M4.0Ve 335 0
5 G 272-61B PM* 01 39 01.6377185550 -17 57 01.001240728           M6V 892 0
6 G 3-14 PM* 01 43 20.1790598651 +04 19 17.959793419 13.64 12.45 10.915 9.879 8.614 M2V 177 0
7 V* V484 Tau PM* 04 30 23.9615609304 +17 29 58.977071268   16.07 14.52 14.36   M3.5V 44 0
8 G 175-34 PM* 04 31 11.5144294005 +58 58 37.463848495     10.98     M4.0V 175 0
9 V* V1005 Ori BY* 04 59 34.8342878424 +01 47 00.669818328   11.48 10.107 9.603 8.239 M0Ve 371 0
10 HD 33793 PM* 05 11 40.5898395497 -45 01 06.361734876 11.624 10.433 8.853 7.9 6.899 M1VIp 367 0
11 G 96-29A PM* 05 17 23.8623810386 +45 50 22.927685973       9.70   M2.5V 74 0
12 G 96-29B PM* 05 17 23.9524233742 +45 50 19.300250088           M4: 22 0
13 HD 36395 PM* 05 31 27.3957852161 -03 40 38.024004501 10.626 9.443 7.968 6.996 5.913 M1.5Ve 574 0
14 Ross 42 PM* 05 32 14.6565094848 +09 49 14.927561364 14.226 13.158 11.529 10.37 8.868 M4Ve 139 1
15 Ross 47 BY* 05 42 09.2676872099 +12 29 21.604835564 14.264 13.130 11.509 10.298 8.709 M4V 304 0
16 HD 265866 PM* 06 54 48.9580633365 +33 16 05.438282419   11.47   9.650   M3V 277 0
17 * rho Gem PM* 07 29 06.71887 +31 47 04.3773 4.48 4.50 4.18 3.86 3.67 F1V 338 0
18 HD 65907 PM* 07 57 46.9142992394 -60 18 11.058944907 6.17 6.17 5.60     F9.5V 213 0
19 CD-59 1774 ** 07 57 55.086648 -60 17 59.60004       9.776   M0.5V 26 0
20 G 51-15 PM* 08 29 49.3527921926 +26 46 33.624143059   16.87   14.736   M6.5Ve 326 0
21 V* AZ Cnc PM* 08 40 29.6791626163 +18 24 08.726250637   19.2 17.59 16.6 13.45 M6.0V 97 0
22 Ross 622 PM* 08 51 43.7920775154 +18 07 29.918741380 14.177 13.03 11.523 10.55 9.417 M1.5V 54 0
23 HD 82443 BY* 09 32 43.7594578944 +26 59 18.706023348   7.78   6.6   G9V(k) 271 1
24 G 236-1 PM* 09 42 34.8407291884 +70 02 01.964331947   11.86 10.58 9.53 8.24 M2.5Ve 113 0
25 V* AD Leo PM* 10 19 36.2808181226 +19 52 12.010446571   10.82 9.52 9.19   dM3 1469 1
26 V* RY Sex PM* 10 36 01.2168771296 +05 07 12.791503989 15.310 14.222 12.636 11.451 9.922 M4V 111 0
27 L 143-23 PM* 10 44 21.2329114167 -61 12 35.275360415   15.74 13.920 12.33 10.31 M5.5V 77 0
28 Wolf 359 PM* 10 56 28.9208702274 +07 00 53.003285286 16.706 15.541 13.507 11.684 9.507 dM6 775 0
29 V* DS Leo BY* 11 02 38.3420210088 +21 58 01.700013360 12.246 11.049 9.572 8.638 7.634 M1.0Ve 269 0
30 HD 95735 PM* 11 03 20.1948195942 +35 58 11.576182057 10.030 8.960 7.520 5.99 4.79 M2+V 795 0
31 Ross 128 PM* 11 47 44.3972681420 +00 48 16.400337591 14.223 12.905 11.153 9.859 8.184 dM4 484 0
32 Wolf 424 ** 12 33 17.361480 +09 01 15.79224 15.398 14.313 12.467 10.937 8.988 M5.5V 329 0
33 BD+36 2322B ** 12 57 39.3125173002 +35 13 19.148808620     13.16 12.939   M4.5Ve 104 1
34 BD+36 2322 BY* 12 57 40.2569835641 +35 13 29.629213095   12.02 10.52 10.137   M0V+M4/5V 242 1
35 BD+13 2618 RS* 13 00 46.5566863405 +12 22 32.677229903 12.314 11.233 9.750 8.785 7.653 M0V 383 1
36 HD 115404 PM* 13 16 51.0514297623 +17 01 01.840901307   7.69 6.66     K2V 316 0
37 HD 115404B PM* 13 16 51.5540142548 +17 00 59.892133365   10.58 9.36 9.069   M0.5V 95 0
38 NAME Proxima Centauri PM* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1483 0
39 * sig CrB RS* 16 14 40.85557 +33 51 30.9497           F6V+G0V 508 0
40 G 202-48 PM* 16 25 24.6230388531 +54 18 14.765465640   11.78 10.07 9.66   M1.5V 248 0
41 V* CM Dra BY* 16 34 20.3302660573 +57 09 44.368918696   14.50 12.87 10.85 9.26 M4.5V 467 0
42 Wolf 629 PM* 16 55 25.2222453644 -08 19 21.296969167 14.691 13.436 11.759 10.574 9.044 M3.5V 243 0
43 HD 152751 ** 16 55 28.7575690 -08 20 10.787849 11.647 10.593 9.023 7.937 6.565 M3.5Ve 547 1
44 VB 8 LM* 16 55 35.2557374336 -08 23 40.753073075   18.7 16.916 14.566 12.24 M7Ve 457 0
45 G 19-7 PM* 16 57 05.7362228328 -04 20 56.318033870   13.92 12.25 10.99 9.432 dM4 122 0
46 BD+68 946 PM* 17 36 25.8993094605 +68 20 20.909627174 11.73 10.65   8.3   M3.0V 345 0
47 * mu.02 Her ** 17 46 25.1789052168 +27 43 02.136763402   11.25   9.4   M3.5V 79 0
48 NAME Barnard's star BY* 17 57 48.4984700685 +04 41 36.113879676 12.497 11.24 9.511 8.298 6.741 M4V 907 2
49 * 72 Oph B PM* 18 07 19.4881888200 +09 34 01.594486020       13.71   ~ 10 0
50 * 72 Oph PM* 18 07 20.9848472070 +09 33 49.848215907 3.95 3.85 3.73 3.59 3.54 A5V 156 0
51 HD 173739 PM* 18 42 46.7043860406 +59 37 49.409446059   10.43 8.93     M3V 427 1
52 HD 173740 PM* 18 42 46.8946714770 +59 37 36.721161413   11.32 9.78     M3.5V 381 1
53 HD 180617 PM* 19 16 55.2565688720 +05 10 08.040554168 11.768 10.63 9.115 8.076 6.782 M3-V 475 0
54 VB 10 PM* 19 16 57.6109547886 +05 09 01.600923413     17.30     M8V 499 1
55 HD 191408 PM* 20 11 11.9387690214 -36 06 04.351725607   5.44 5.32     K2.5V 294 1
56 HD 191408B PM* 20 11 12.8028949300 -36 06 32.166102762           M3.5 230 1
57 Wolf 918 PM* 21 09 17.4271514815 -13 18 09.013127841 13.501 12.362 10.869 9.891 8.805 M1V 151 0
58 HD 204961 PM* 21 33 33.9751191976 -49 00 32.399427028 11.359 10.176 8.672 7.665 6.479 M1.5V 336 1
59 V* EZ Aqr Er* 22 38 33.576000 -15 17 59.75700 15.762 14.33 12.38 12.12 8.677 M5V 320 1
60 V* EV Lac PM* 22 46 49.7312610268 +44 20 02.374381562   11.85 10.26 9.89   M4.0Ve 993 2
61 V* GT Peg BY* 22 51 53.5351209551 +31 45 15.192825225       11.281   M3.5Ve 174 0
62 BD-15 6290 BY* 22 53 16.7325836486 -14 15 49.304052185 12.928 11.749 10.192 9.013 7.462 M3.5V 1106 1
63 HD 217987 PM* 23 05 52.0357857091 -35 51 11.055185039   8.83 7.39     M2V 320 0
64 BD-17 6768 LM* 23 32 46.80410 -16 45 07.2407 12.81 11.86 10.38   8.020 M3Ve 85 0

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