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Stellar coronae at the end of the main sequence - A ROSAT survey of the late M dwarfsWe 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.
Document ID
19930057240
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Fleming, Thomas A.
(Max-Planck-Inst. fuer Extraterrestrische Physik, Garching, Germany; Joint Inst. for Lab. Astrophysics, Boulder CO, United States)
Giampapa, Mark S.
(National Solar Observatory Tucson, AZ, United States)
Schmitt, J. H. M. M.
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Bookbinder, Jay A.
(Smithsonian Astrophysical Observatory Cambridge, MA, United States)
Date Acquired
August 16, 2013
Publication Date
June 10, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 410
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A41237
Funding Number(s)
CONTRACT_GRANT: NAGW-112
CONTRACT_GRANT: NAGW-1480
Distribution Limits
Public
Copyright
Other

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