Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...258..651f&link_type=abstract
Astrophysical Journal, Part 1, vol. 258, July 15, 1982, p. 651-660. Research supported by the Natural Sciences and Engineering
Astronomy and Astrophysics
Astrophysics
62
Stellar Color, Variable Stars, White Dwarf Stars, Hydrogen, Stellar Evolution, Stellar Mass, Stellar Temperature
Scientific paper
Results are summarized of a continuing survey for additional pulsating white dwarfs. Particular attention is given to the color distributions of stars investigated for variability. It is noted that (in terms of the Greenstein G-R color index) among the hydrogen-rich white dwarfs, only variable stars have thus far been found in the G-R range from -0.45 to -0.38. This color range corresponds to an interval of effective temperatures from 13,000 K to 11,000 K. This observational result is seen as implying that the vast majority, and probably all, of the hydrogen-rich white dwarfs evolve to become ZZ Ceti variables during an evolutionary phase of their lifetimes. Completeness arguments and a discussion of possible selection effects corroborate this conclusion. The consequences of this result for theoretical studies of ZZ Ceti stars are briefly discussed.
Dearborn David S. P.
Fontaine Gérard
Gustafson J.
Lacombe P.
McGraw John T.
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