The Coronal Temperatures of Low-Mass Main-Sequence Stars
The Coronal Temperatures of Low-Mass Main-Sequence Stars
复制标题
低质量主序星的日冕温度
DOI:
10.1051/0004-6361/201425283
复制
发表时间:
2015
期刊:
影响因子:
--
通讯作者:
M. Gudel
中科院分区:
文献类型:
--
作者:
C. Johnstone;M. Gudel
Aims. 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.
Methods. 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.
Results. 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=0.11 Fx^0.26, where Tcor is in MK and Fx is in erg/s/cm^2.
影响因子:
6.5
作者:
S. Lalitha;B. Fuhrmeister;U. Wolter;J. Schmitt;D. Engels;M. Wieringa
通讯作者:
S. Lalitha;B. Fuhrmeister;U. Wolter;J. Schmitt;D. Engels;M. Wieringa
DOI:
10.1088/0004-637x/794/2/144
发表时间:
2014
期刊:
The Astrophysical Journal
影响因子:
--
作者:
Reiners;Schüssler;Passegger
通讯作者:
Passegger