Stellar coronae at the end of the main sequence - A ROSAT survey of the late M dwarfs

Astronomy and Astrophysics – Astronomy

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Dwarf Stars, M Stars, Main Sequence Stars, Rosat Mission, Spaceborne Astronomy, Stellar Coronas, Astronomical Catalogs, Light Curve, Sky Surveys (Astronomy), X Ray Astronomy, X Ray Sources

Scientific paper

We present X-ray data, both detections and upper limits, from the ROSAT all-sky survey for most known M dwarfs later than type M5, as well as from selected ROSAT pointed observations of some of these stars. We compare these data with similar data for early M dwarfs in an attempt to probe the nature of the magnetic dynamo and coronal heating mechanism for the very late M dwarfs, which are presumably totally convective. Our results indicate that late M dwarfs can have coronae which are just as active as those for the early M dwarfs and that coronal heating efficiency for 'saturated' stars does not drop at spectral type M6.

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