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The hot white-dwarf companions of HR 1608, HR 8210, and HD 15638We have obtained low-dispersion IUE spectra of the late-type stars HD 15638 (F3 V), HR 1608 (=63 Eridani, KO IV), and HR 8210 (A8m). Each of these stars had been detected as a strong EUV source with the Wide Field Camera aboard the ROSAT satellite. The short-wavelength IUE spectrum of each star reveals the presence of a hot white-dwarf companion. We have fit the Lyman-alpha profile and UV continuum of each white dwarf using pure hydrogen models. The excellent fit of the data to the models provides confirmation of the Finley and Koester absolute calibration of the SWP camera of IUE. The UV data alone are insufficient to constrain the model gravity, but an additional constraint is provided by the photometric distance to the late-type primary. The most interesting of the three white dwarfs is the companion to HR 8210 for which our results imply a mass of 1.15 +0.05/-0.15 solar mass. This result is in good agreement with the lower limit on the mass derived from the spectroscopic orbit (greater than 1.1 solar mass), provided that the inclination is close to 90 deg.
Document ID
19940033351
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Landsman, Wayne
(Hughes STX Corp.; NASA, Goddard Space Flight Center Greenbelt, MD, United States)
Simon, Theodore
(Hawaii Univ. Honolulu, United States)
Bergeron, P.
(Montreal Univ. Canada)
Date Acquired
August 16, 2013
Publication Date
August 1, 1993
Publication Information
Publication: Astronomical Society of the Pacific, Publications
Volume: 105
Issue: 690
ISSN: 0004-6280
Subject Category
Astrophysics
Accession Number
94A10006
Funding Number(s)
CONTRACT_GRANT: NAG5-2150
Distribution Limits
Public
Copyright
Other

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