2002A&A...383..210M


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.20CEST11:13:05

2002A&A...383..210M - Astronomy and Astrophysics, volume 383, 210-217 (2002/2-3)

On X-ray variability in ROSAT-PSPC observations of F7-K2 stars.

MARINO A., MICELA G., PERES G. and SCIORTINO S.

Abstract (from CDS):

We have analyzed the X-ray variability of dF7-dK2 stars in the solar neighborhood detected with the pointed ROSAT-PSPC observations. Our data base is the sample of all stars listed in the CNS3 catalog (Gliese & Jahress, 1991, Cat. V/70) having a B-V color between 0.5 and 0.9; it includes 70 pointed observations of 40 distinct stars or multiple systems. We have applied the unbinned Kolmogorov-Smirnov test on all X-ray photon time series of our sample: only 10 observations relative to 8 distinct stars are variable at a confidence level greater than 99% and 4 of them belong to multiple systems. For the subsample of 9 stars observed both at the beginning and at the end of the mission, we can study the variability on time scale of years and compare amplitude variations at short and long time scales. Our analysis suggests that, for these stars, the X-ray variability is more likely on longer time scale. All the stars variable on long time scale, and not on short time scale, are relatively quiet and similar to the Sun, suggesting that the variations may be due to cycles. The comparison of our results with those previously obtained for dM stars shows that the amplitude of variability of X-ray emission from dF7-dK2 stars is smaller than that observed in dM stars.

Abstract Copyright:

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

Simbad objects: 45

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Number of rows : 45

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 HD 166 BY* 00 06 36.7840943605 +29 01 17.410390108   6.88   5.6   G8 324 1
2 * zet Tuc PM* 00 20 04.2599713 -64 52 29.254760 4.82 4.80 4.23 3.73 3.40 F9.5V 351 0
3 * 9 Cet BY* 00 22 51.7883318927 -12 12 33.972374893 7.29 7.05 6.39     G2.5V 459 0
4 * bet Hyi PM* 00 25 45.07036 -77 15 15.2860 3.52 3.41 2.79 2.28 1.94 G0V 561 0
5 HD 5015 PM* 00 53 04.1958850619 +61 07 26.301822158 5.43 5.34 4.80 4.32 4.02 F9V 210 0
6 * 107 Psc PM* 01 42 29.7634932653 +20 16 06.660242064 6.57 6.08 5.24 4.55 4.12 K1V 519 0
7 HD 13445 PM* 02 10 25.9190575041 -50 49 25.467227759   6.945 6.117     K1.5V 423 1
8 HD 17925 RS* 02 52 32.1281853696 -12 46 10.970649463 7.48 6.91 6.05 5.34 4.89 K1V 479 0
9 * iot Per PM* 03 09 04.0198629 +49 36 47.799638 4.76 4.64   3.7   G0V 511 0
10 * kap01 Cet BY* 03 19 21.6963205 +03 22 12.715139 5.71 5.52 4.85 4.27 3.91 G5V 835 0
11 * e Eri PM* 03 19 55.6509352 -43 04 11.217495 5.20 4.98 4.27 3.65 3.25 G6V 405 1
12 HD 28946 PM* 04 33 50.3989211158 +05 23 06.108960479   8.72   7.4   G9V 85 0
13 * zet Dor PM* 05 05 30.6561782324 -57 28 21.728931803   5.215 4.708     F9VFe-0.5 223 0
14 * pi. Men PM* 05 37 09.8851202601 -80 28 08.831347245   6.25 5.67     G0V 264 1
15 HD 37394 BY* 05 41 20.3357283721 +53 28 51.810629854 7.58 7.07 6.23 5.54 5.11 K1 305 0
16 * alf Men PM* 06 10 14.4741194137 -74 45 10.963587125   5.798 5.069     G7V 254 0
17 * pi.01 UMa BY* 08 39 11.7043265307 +65 01 15.268273190 6.33 6.26 5.64 5.12 4.79 G0.5V 530 0
18 * 61 UMa PM* 11 41 03.0159358291 +34 12 05.882438337 6.31 6.08 5.34 4.73 4.38 G8V 578 0
19 * bet Vir PM* 11 50 41.7182390 +01 45 52.991019 4.26 4.15 3.60 3.13 2.85 F9V 870 0
20 HD 106156 PM* 12 12 57.5321593334 +10 02 15.777335940   8.71   7.4   G8V 89 0
21 * bet CVn ** 12 33 44.5448195 +41 21 26.924857 4.91 4.86 4.25 3.73 3.42 G0V 550 0
22 * bet Com PM* 13 11 52.3937856 +27 52 41.453553 4.92 4.84 4.25 3.77 3.47 F9.5V 858 0
23 * 61 Vir PM* 13 18 24.3142756 -18 18 40.304648 5.710 5.440 4.740     G6.5V 609 1
24 V* EK Dra BY* 14 39 00.2109485496 +64 17 29.977371998   8.243 7.604     G1.5V 391 0
25 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 925 1
26 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1167 0
27 * ksi Boo B PM* 14 51 23.0443965381 +19 06 06.881628054   7.981 6.816     K5Ve 342 0
28 * ksi Boo A PM* 14 51 23.3876853015 +19 06 01.641924918   5.40 4.675     G7Ve 506 0
29 V* DE Boo RS* 14 53 23.7667403 +19 09 10.081308   6.84   5.5   K0.5V 254 0
30 * i Boo A PM* 15 03 47.2296400706 +47 39 14.318060796   5.72 5.136     F5V 46 0
31 * i Boo B SB* 15 03 47.5145615709 +47 39 16.128926807   6.82 6.004     G9: 54 1
32 * lam Ser PM* 15 46 26.6144291449 +07 21 11.041647444 5.13 5.03 4.42 3.92 3.60 G0-V 543 0
33 HD 147513 PM* 16 24 01.2905970257 -39 11 34.734611237 6.17 6.02 5.376     G5V 317 1
34 * zet Her SB* 16 41 17.16104 +31 36 09.7873 3.640 3.430 2.800 2.31 1.99 G0IV 528 0
35 * zet Her B * 16 41 17.585592 +31 36 07.31484   6.11 5.31     K0V 26 0
36 HD 152391 PM* 16 52 58.8025427362 -00 01 35.116299669   7.40 6.64     G8.5Vk: 343 0
37 * 36 Oph A PM* 17 15 20.7837627960 -26 36 06.120125290   5.93 5.08     K2V 252 0
38 * 36 Oph B PM* 17 15 20.9846233161 -26 36 10.159381821   5.88 5.03     K1V 230 0
39 * mu. Ara PM* 17 44 08.7036342277 -51 50 02.591049123   5.85 5.15     G3IV-V 482 2
40 HD 175225 PM* 18 51 34.9220457822 +52 58 30.251981548   6.35   5.0   G9IVa 109 1
41 HD 177565 PM* 19 06 52.4643138830 -37 48 38.372801262   6.88 6.16     G6V 154 0
42 * sig Dra PM* 19 32 21.5902990 +69 39 40.234737 5.860 5.460 4.680 4.04 3.63 K0V 591 0
43 * 15 Sge PM* 20 04 06.2209062328 +17 04 12.677429047   6.390 5.788 5.4   G0V 349 0
44 V* VW Cep EB* 20 37 21.6248469581 +75 36 01.889162699   8.13   7.0   G8V+K0V 528 0
45 * 51 Peg PM* 22 57 27.9804167474 +20 46 07.782240714 6.39 6.16 5.46 4.97 4.61 G2IV 1096 1

    Equat.    Gal    SGal    Ecl

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2021.06.20-11:13:05

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