The Coronal Temperatures of Low-Mass Main-Sequence Stars

The Coronal Temperatures of Low-Mass Main-Sequence Stars
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低质量主序星的日冕温度

DOI:
10.1051/0004-6361/201425283
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发表时间:
2015
期刊:
arXiv: Solar and Stellar Astrophysics
影响因子:
--
通讯作者:
M. Gudel
M. Gudel
中科院分区:
--
文献类型:
--
作者:
C. Johnstone;M. Gudel

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目标。我们研究低质量主序星的 X 射线发射,以推导出日冕温度和 X 射线活动水平之间可靠的一般标度定律。 方法。我们收集了大量恒星样本的硬度比和 X 射线光度的 ROSAT 测量结果,以推导出哪种恒星 X 射线发射参数与日冕温度最密切相关。我们计算了 24 颗低质量主序星样本的平均日冕温度,并测量了从文献中收集的发射测量分布 (EMD)。这些 EMD 基于 XMM-Newton 和 Chandra 测量的高分辨率 X 射线光谱。 结果。我们确认日冕平均温度和表面 X 射线通量 Fx 之间存在一种通用的标度关系,该关系适用于所有低质量主序星。我们发现日冕温度与Fx的关系为Tcor=0.11 Fx^0.26,其中Tcor的单位是MK,Fx的单位是erg/s/cm^2。
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.
DOI: 10.1051/0004-6361/201321419
发表时间: 2013-09
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
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DOI: 10.1088/0004-637x/794/2/144
发表时间: 2014
期刊: The Astrophysical Journal
影响因子: --
作者:
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