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Spectroscopic studies and atmospheric parameters of pulsating DA white dwarf (ZZ Ceti) stars
Daou, D.; Wesemael, F.; Bergeron, P.; Fontaine, G.; Holberg, J. B.
AA(Montreal, Universite, Montreal, Canada), AB(Montreal, Universite, Montreal, Canada), AC(Montreal, Universite, Montreal, Canada), AD(Montreal, Universite, Montreal, Canada; Steward Observatory, Tucson, AZ), AE(Arizona, University, Tucson, AZ)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 364, Nov. 20, 1990, p. 242-250. Research supported by NSERC, Ministere de l'Education du Quebec, and NASA. (ApJ Homepage)
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NASA/STI Keywords:
Stellar Atmospheres, Stellar Oscillations, Stellar Spectrophotometry, White Dwarf Stars, Balmer Series, Spectral Line Width, Stellar Gravitation, Stellar Models
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Optical spectrophotometry of a sample of 10 ZZ Ceti stars is presented. The observations are analyzed in terms of new grids of synthetic spectra, which incorporate the new occupation probability formalism of Hummer and Mihalas (1988) to calculate the atomic level populations. The ZZ Ceti stars studied in this work all have temperatures between 11,320 and 13,420 K. The average surface gravity for the sample is log g = 8.03, with sigma(log g) = 0.25. The analysis confirms the lower-than-average gravity of R548 (log g = 7.80), suspected from earlier photometry, as well as the somewhat larger-than-average gravity of G226-29 (log g = 8.20) which may, however, be insufficient to account for its short periods. The implications of these determinations for a few objects of particular astrophysical interest are discussed.

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