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An X-ray-selected white dwarf of intermediate luminositySpectrophotometric observations of a previously uncataloged 17th magnitude hot DA white dwarf are reported. Simple models can reproduce the visible spectrum if the star has log g = 8.0 + or - 0.5 and T(eff) = 22,500 + or - 2000 K. The implied distance is about 200 pc. It is plausible that photospheric emission from this star is responsible for the observed X-ray source. Identification of this object with the X-ray source would imply a photosphere free of traces of helium inferred in other X-ray-emitting DAs, and would support previous suggestions that current DA model atmospheres are in need of revision at X-ray wavelengths.
Document ID
19870053196
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Margon, Bruce
(Washington Univ. Seattle, WA, United States)
Bolte, Michael
(Washington Univ. Seattle, WA, United States)
Anderson, Scott F.
(Washington, University Seattle, United States)
Date Acquired
August 13, 2013
Publication Date
May 1, 1987
Publication Information
Publication: Astronomical Journal
Volume: 93
ISSN: 0004-6256
Subject Category
Astrophysics
Accession Number
87A40470
Funding Number(s)
CONTRACT_GRANT: NAG8-433
Distribution Limits
Public
Copyright
Other

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