M dwarfs X-ray activity and rotation relations : J/A+A/638/A20


Authors : Magaudda E. orcid , Stelzer B., Covey K.R. (hide) , Stelzer B., Covey K.R. et..al

Bibcode : 2020A&A...638A..20M (ADS) (Simbad) (Objects) (hide)

CDS Keywords : Stars, M-type; X-ray sources; Stars, masses; Stars, diameters
UAT : M stars, X-ray sources, Stellar masses, Stellar radii

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Inserted into VizieR : 03-Jun-2020
Last modification : 23-Dec-2024

Relation of X-ray activity and rotation in M dwarfs and predicted time-evolution of the X-ray luminosity. (2020)

Keywords : stars low-mass - stars: activity - stars: rotation - stars: magnetic field - X-rays: stars

Abstract:The relation of activity to rotation in M dwarfs is of high astrophysical interest because it provides observational evidence of the stellar dynamo, which is poorly understood for low-mass stars, especially in the fully convective regime. Previous studies have shown that the relation of X-ray activity to rotation consists of two different regimes: the saturated regime for fast-rotating stars and unsaturated regime for slowly rotating stars. The transition between the two regimes lies at a rotation period of ~10d. We present here a sample of 14 M dwarf stars observed with XMM-Newton and Chandra, for which we also computed rotational periods from Kepler Two-Wheel (K2) Mission light curves. We compiled X-ray and rotation data from the ...(more)
Abstract: (hide)
Stellar parameters and updated X-ray results computed in this work for the 288 stars from the literature samples.
Enza Magaudda, magaudda(at)astro.uni-tuebingen.de

                
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