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The Coronal Temperatures of Low-Mass Main-Sequence Stars

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arxiv 1505.00643 v2 pith:RBBQSZNL submitted 2015-05-04 astro-ph.SR

The Coronal Temperatures of Low-Mass Main-Sequence Stars

classification astro-ph.SR
keywords coronalx-raystarslow-massmain-sequencetemperatureemissionaverage
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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