Abstract
view Abstract Citations (46) References (31) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Stromgren photometry of ZZ Ceti and other DA white dwarfs. Fontaine, G. ; Bergeron, P. ; Lacombe, P. ; Lamontagne, R. ; Talon, A. Abstract Stromgren colors for a sample of 71 stars classified as DA white dwarfs are presented. Comparison with the recent model atmospheres of the Kiel group indicates that the average gravity of 63 stars of the sample is log g = 7.98 + or - 0.31, with no indication of a dependence on the effective temperature. This is consistent with the theoretical expectation that white dwarfs evolve at constant gravity. Correlations between Stromgren colors and Greenstein (1982) multichannel colors are also given, using 52 stars that have been observed in common in the two systems. These correlations are used to compare the data with a second set of model atmospheres computed by Shipman (1979). Contrary to what has been suggested in the past, no fundamental differences are found when confronting the Stromgren data with the DA model atmospheres of Shipman or those of the Kiel group. Finally, observations of 11 pulsating objects reveal the existence of a narrow instability strip in the effective temperature range of 13,000 to 11,000 K in a /(u - b), (b - y)/ two-color diagram. The present results add evidence to the contention that all DA white dwarfs evolve to become ZZ Ceti pulsators in the instability strip. Publication: The Astronomical Journal Pub Date: June 1985 DOI: 10.1086/113816 Bibcode: 1985AJ.....90.1094F Keywords: Stellar Atmospheres; Stellar Color; Stellar Spectrophotometry; Variable Stars; White Dwarf Stars; Stellar Evolution; Stellar Gravitation; Stellar Oscillations; Stellar Temperature; Astrophysics full text sources ADS | data products SIMBAD (70)
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