The effective temperature of Wolf 485A and the statistics of ZZ Ceti stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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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.

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