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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
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
Distribution Limits
Public
Copyright
Other