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Stellar coronae at the end of the main sequence - A ROSAT survey of the late M dwarfs
Fleming, Thomas A.; Giampapa, Mark S.; Schmitt, J. H. M. M.; Bookbinder, Jay A.
AA(Max-Planck-Inst. für extraterrestrische Physik, Garching bei München, Germany; Joint Inst. for Lab. Astrophysics, Boulder, CO), AB(National Solar Observatory, Tucson, AZ), AC(Max-Planck-Inst. für extraterrestrische Physik, Garching bei München, Germany), AD(Smithsonian Astrophysical Observatory, Cambridge, MA)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 410, no. 1, p. 387-392. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
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
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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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