You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
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
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
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