Spectroscopic studies and atmospheric parameters of pulsating DA white dwarf (ZZ Ceti) stars

Details Spectroscopic studies and atmospheric parameters of pulsating DA white dwarf (ZZ Ceti) stars Spectroscopic studies and atmospheric parameters of pulsating DA white dwarf (ZZ Ceti) stars

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...364..242d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 364, Nov. 20, 1990, p. 242-250. Research supported by NSERC, Ministere de l

Mathematics

Probability

35

Stellar Atmospheres, Stellar Oscillations, Stellar Spectrophotometry, White Dwarf Stars, Balmer Series, Spectral Line Width, Stellar Gravitation, Stellar Models

Scientific paper

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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