OBSERVATIONS OF GLIESE 890 AND OTHER POSSIBLY RAPIDLY-ROTATING FIELD M DWARFS

BV photometry of the rapidly-rotating M dwarf Gliese 890 (dM2e) obtained in 1983-84 is presented. We examine the long-term photometric behavior of the star and find evidence for the presence of persistent polar active regions, as has been proposed by Young et al. (1987). In an attempt to detect addi...

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Bibliographic Details
Published in:Publications of the Astronomical Society of the Pacific 1988-05, Vol.100 (627), p.579-582
Main Authors: BOPP, BERNARD W., DEMPSEY, ROBERT C., AFRICANO, JOHN L., GOODRICH, BRET D.
Format: Article
Language:English
Subjects:
Astronomical photometry
Astronomy
Dwarf stars
Earth, ocean, space
Exact sciences and technology
M dwarfs
Normal stars (by class): general or individual
Observational astronomy
Optical observatories
Radial velocity
Spectroscopic binary stars
Spectroscopy
Stars
Stellar rotation
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Summary:BV photometry of the rapidly-rotating M dwarf Gliese 890 (dM2e) obtained in 1983-84 is presented. We examine the long-term photometric behavior of the star and find evidence for the presence of persistent polar active regions, as has been proposed by Young et al. (1987). In an attempt to detect additional rapidly-rotating field M dwarfs similar to Gliese 890, we observed four dM stars suspected by Cowley and Hartwick (1982) to show broadened absorption lines. CCD spectra with 1 Å resolution fail to show any evidence for line broadening. The Ha line is in absorption in all four stars.
ISSN:0004-6280
1538-3873
DOI:10.1086/132205