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Title:
UBV photometry of hot white dwarf stars
Authors:
Cheselka, Mathew; Holberg, J. B.; Watkins, Ron; Collins, James; Tweedy, R. W.
Affiliation:
AA(Univ. of Arizona, Tucson, AZ), AB(Univ. of Arizona, Tucson, AZ), AC(Univ. of Arizona, Tucson, AZ), AD(Univ. of Arizona, Tucson, AZ), AE(Univ. of Arizona, Tucson, AZ)
Publication:
The Astronomical Journal (ISSN 0004-6256), vol. 106, no. 6, p. 2365-2369 (AJ Homepage)
Publication Date:
12/1993
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL PHOTOMETRY, UBV SPECTRA, ULTRAVIOLET PHOTOMETRY, WHITE DWARF STARS, SKY SURVEYS (ASTRONOMY), STELLAR COLOR, STELLAR TEMPERATURE, X RAY SOURCES
DOI:
10.1086/116808
Bibliographic Code:
1993AJ....106.2365C

Abstract

Johnson UBV photometry has been obtained for a set of hot degenerate stars, primarily DA and DO white dwarfs from among those detected in the Palomar-Green survey of UV excess objects. Most of our program stars have estimated effective temperatures (Teff) in the range 22,000 to 80,000 K and have no previous photometry. Some objects selected are also x-ray and extreme ultraviolet sources from the ROSAT all sky survey. The importance of precise photometric measurements in the analysis of x-ray data is discussed. A discrepancy between the observed colors and predicted colors is noted, and possibly accounted for by difficulties in defining the atmospheric cutoff of the U band and a general lack of hot stars used to define the photometric transformation between theoretical and observed colors.

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