Astronomy and Astrophysics – Astronomy
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244..291d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, May 15, 1990, p. 291-293.
Astronomy and Astrophysics
Astronomy
14
Dwarf Stars, M Stars, Stellar Mass Ejection, Stellar Rotation, Companion Stars, H Alpha Line, Magnesium, Stellar Envelopes, Stellar Spectrophotometry
Scientific paper
Mg II line fluxes from the rapidly rotating single M dwarf Gliese 890 show a 'dip' lasting less than 120 min. H-alpha spectra obtained simultaneously show systematic profile changes during the Mg II 'dip': the line bisector of the H-alpha emission feature shows at first a red then a blue displacement. The behavior of both the H-alpha line bisector and the Mg II emission 'dip' is consistent with a model in which a cloud of mainly neutral hydrogen passes in front of the disk of the star. Similar behavior has been observed in the rapidly rotating single K dwarf AB Doradus. The projected area of the Gl 890 cloud is 0.25-0.40 times that of the stellar disk.
Collier Cameron Andrew
Doyle Gerry J.
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