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Spectrophotometry of peculiar B and A stars. XVIII - The helium rich variable stars HR 1890, Sigma Orionis E, and HD 37776Optical region spectrophotometry at 3300-7850 A has been obtained for three helium rich stars, HR 1890, Sigma Ori E, and HD 37776, of the Orion OB1 Association. New uvby-beta photometry of HR 1890 and HD 37776 as well as published data are also used to investigate the variability of these stars. A new period of 1.53862 days was determined for HD 37776. For all three stars H-beta varies in antiphase with strong He I lines. The spectrophotometric bandpass containing the strong He I line at 4471 A varies in phase with the R index of Pedersen and Thomsen (1977). Evidence is found for weak absorption features which appear to be an extension of the 5200 A feature seen in cooler CP stars.
Document ID
19860032156
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Adelman, S. J.
(NASA Goddard Space Flight Center Greenbelt, MD; The Citadel, Charleston, SC, United States)
Pyper, D. M.
(Nevada, University Las Vegas, United States)
Date Acquired
August 12, 2013
Publication Date
November 1, 1985
Publication Information
Publication: Astronomy and Astrophysics Supplement Series
Volume: 62
ISSN: 0365-0138
Subject Category
Astrophysics
Accession Number
86A16894
Distribution Limits
Public
Copyright
Other

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