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STELLAR SURFACE PHENOMENA: Hα VARIABILITY IN dMe STARS
BERNARD W. BOPP and MARION SCHMITZ
Publications of the Astronomical Society of the Pacific
Vol. 90, No. 537 (October 1978), pp. 531-535
Published by: Astronomical Society of the Pacific
Stable URL: http://www.jstor.org/stable/40677246
Page Count: 5
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Image-tube spectrograms (resolution ~ 1 Å) of the Ha emission line in 15 late-type dwarf stars are examined for evidence of equivalent-width variability on a time scale of days, weeks, and years. Scattered data show Ha variations in three known BY Draconis variables: YY Gem, Gl 182, and BD + 48° 1958A. A much more extensive series of spectrograms of BY Dra itself obtained during 1972 and 1976 shows only a marginal correlation between Ha EW and rotational phase. Criteria for detection of such variability are noted.
Publications of the Astronomical Society of the Pacific © 1978 The University of Chicago Press