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Ultraviolet photometry from the Orbiting Astronomical Observatory. XXVIII - Ultraviolet light curves for Alpha Lupi and BW VulpeculaePhotometric data from the Wisconsin Experiment Package on OAO-2 have been used to construct light curves at three ultraviolet wavelengths for Alpha Lup and at seven wavelengths for BW Vul. Both stars are well-known variables of the Beta Cephei (Beta Canis Majoris) type. The light curves for Alpha Lup are in good agreement with the radial-velocity period. A temperature variation of 400-500 K is derived. The BW Vul light curves confirm recent ephemerides based on a secularly varying period and show a stillstand near light maximum at some wavelengths. Both stars exhibit increasing light amplitude at the shortest ultraviolet wavelengths. There is little evidence for cycle-to-cycle variations on a time scale of the order of 1 day.
Document ID
19780040936
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lesh, J. R.
(NASA Goddard Space Flight Center Laboratory for Astronomy and Solar Physics, Greenbelt, Md.; Denver University, Denver, Colo., United States)
Date Acquired
August 9, 2013
Publication Date
February 1, 1978
Publication Information
Publication: Astrophysical Journal
Subject Category
Astronomy
Accession Number
78A24845
Funding Number(s)
CONTRACT_GRANT: NSG-5135
CONTRACT_GRANT: NSG-5069
Distribution Limits
Public
Copyright
Other

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