UBV photometry of hot white dwarf stars

Details UBV photometry of hot white dwarf stars UBV photometry of hot white dwarf stars

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.2365c&link_type=abstract

The Astronomical Journal (ISSN 0004-6256), vol. 106, no. 6, p. 2365-2369

Astronomy and Astrophysics

Astronomy

24

Astronomical Photometry, Ubv Spectra, Ultraviolet Photometry, White Dwarf Stars, Sky Surveys (Astronomy), Stellar Color, Stellar Temperature, X Ray Sources

Scientific paper

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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