2015A&A...578A.129J


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.16CET03:45:46

2015A&A...578A.129J - Astronomy and Astrophysics, volume 578A, 129-129 (2015/6-1)

The coronal temperatures of low-mass main-sequence stars.

JOHNSTONE C.P. and GUEDEL M.

Abstract (from CDS):

We study the X-ray emission of low-mass main-sequence stars to derive a reliable general scaling law between coronal temperature and the level of X-ray activity. We collect ROSAT measurements of hardness ratios and X-ray luminosities for a large sample of stars to derive which stellar X-ray emission parameter is most closely correlated with coronal temperature. We calculate average coronal temperatures for a sample of 24 low-mass main-sequence stars with measured emission measure distributions (EMDs) collected from the literature. These EMDs are based on high-resolution X-ray spectra measured by XMM-Newton and Chandra. We confirm that there is one universal scaling relation between coronal average temperature and surface X-ray flux, FX, that applies to all low-mass main-sequence stars. We find that coronal temperature is related to FX by Tcor=0.11FX0.26, where Tcor is in MK and FX is in erg/s/cm2.

Abstract Copyright:

Journal keyword(s): Sun: corona - Sun: X-rays, gamma rays - stars: activity - stars: coronae - stars: low-mass - X-rays: stars

Simbad objects: 23

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Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * 47 Cas PM* 02 05 07.4242273 +77 16 52.824198   5.590 5.268     F0V 103 1
2 * kap01 Cet BY* 03 19 21.6963205 +03 22 12.715139 5.71 5.52 4.85 4.27 3.91 G5V 811 0
3 * eps Eri BY* 03 32 55.8449634 -09 27 29.731165 5.19 4.61 3.73 3.00 2.54 K2V 1660 1
4 * pi.03 Ori PM* 04 49 50.4109057 +06 57 40.588294 3.620 3.630 3.190 2.77 2.51 F6V 522 0
5 HD 36705 TT* 05 28 44.8916324761 -65 26 55.289846904 8.259 7.856 6.999 6.496 5.993 K0V 910 0
6 * chi01 Ori RS* 05 54 22.9829893 +20 16 34.222038 5.08 5.00 4.40 3.90 3.59 G0V 791 0
7 V* YZ CMi BY* 07 44 40.1726285952 +03 33 08.877830321 13.761 12.831 11.225 9.958 8.263 M4.0Ve 769 0
8 V* pi.01 UMa BY* 08 39 11.7043265307 +65 01 15.268273190 6.33 6.26 5.64 5.12 4.79 G0.5V 508 0
9 BD+20 2465 ** 10 19 36.2808024653 +19 52 12.014037746   10.82 9.52 9.19   M4Vae 1115 0
10 * bet Com PM* 13 11 52.3937856 +27 52 41.453553 4.92 4.84 4.25 3.77 3.47 F9.5V 838 0
11 V* V645 Cen Fl* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 891 0
12 V* EK Dra BY* 14 39 00.2109485496 +64 17 29.977371998   8.243 7.604     G1.5V 367 0
13 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 865 1
14 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1110 0
15 * ksi Boo B PM* 14 51 23.0443965381 +19 06 06.881628054   7.981 6.816     K5Ve 336 0
16 * ksi Boo A PM* 14 51 23.3876853015 +19 06 01.641924918   5.40 4.675     G7Ve 492 0
17 * 36 Oph A PM* 17 15 20.7837627960 -26 36 06.120125290   5.93 5.08     K2V 243 0
18 * 36 Oph B PM* 17 15 20.9846233161 -26 36 10.159381821   5.88 5.03     K1V 224 0
19 * 70 Oph A SB* 18 05 27.370543 +02 29 59.31669       3.6   K0V 201 0
20 * 70 Oph B PM* 18 05 27.4622283249 +02 29 56.223591080   7.26 6.07 5.6   K4V 102 0
21 SCR J1845-6357 PM* 18 45 05.2506866871 -63 57 47.458544682   19.05 17.40 14.99 12.46 M8.5V 55 1
22 V* AU Mic BY* 20 45 09.5323695486 -31 20 27.241710746   10.05 8.627 9.078 6.593 M1VeBa1 873 0
23 V* EV Lac Fl* 22 46 49.7311740821 +44 20 02.372223230   11.85 10.26 9.89   M4.0V 778 2

    Equat.    Gal    SGal    Ecl

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2019.11.16-03:45:46

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