Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...282..683y&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 282, July 15, 1984, p. 683-687.
Astronomy and Astrophysics
Astrophysics
39
Angular Velocity, Dwarf Stars, H Alpha Line, Late Stars, M Stars, Stellar Rotation, Absorption Spectra, Faculae, Stellar Evolution, Stellar Mass, Stellar Spectrophotometry
Scientific paper
The paper reports on some important anomalous phenomena which were discovered during a systematic investigation of the properties of low-mass (M dwarf) stars. It is found that the single M dwarfs GLS 410 and GLS 179 have a diluted H-alpha absorption line. It is suggested that this is due to weak plage activity and that these stars are in a transition state between the chromospherically active dMe and the inactive dM state. It is found that the dMe star GLS 890 is a rapidly rotating single M dwarf with v sin i of approximately 70 km/s and predicted that it should have a photometric wave with about 8 hr period. It is found that the Joy and Abt 'dMe' assignment is in error not only for GLS 179 but also for GLS 176, GLS 611.3, and GLS 908. The 'dMe' assignment for BD + 12.2201 deg is problematic and may be due to misidentification.
Harlan Eugene
Skumanich Andrew
Young Alex
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