Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...288..764w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 288, Jan. 15, 1985, p. 764-768. Research supported by the Natural Sciences
Astronomy and Astrophysics
Astrophysics
6
Stellar Spectrophotometry, Stellar Temperature, Variable Stars, White Dwarf Stars, H Lines, Optical Measurement, Statistical Analysis, Stellar Color, Stellar Oscillations
Scientific paper
High-speed photometry shows that the bright DA white dwarf Wolf 485A is not a variable star, with an upper limit on the semi-amplitudes of luminosity variations of 0.0005 mag in the period range characteristic of the ZZ Ceti stars. However, its time-averaged multichannel color index (G-R) places it in the instability strip. If confirmed, this result would make Wolf 485A an important object, the lone counterexample to the assertion that all DA white dwarfs evolve to become nonradial pulsators as they enter the ZZ Ceti instability strip. New photometric and spectrophotometric observations conclusively show, however, that the effective temperature of Wolf 485A is around 15,000 K, substantially above the blue edge of the instability strip (Te approximately 13,000 K). The source of this discrepancy most probably lies in erroneous multichannel colors for that object.
Fontaine Gérard
Wesemael François
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