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Title:
Spectroscopic Studies of DB White Dwarfs: The Instability Strip of the Pulsating DB (V777 Herculis) Stars
Authors:
Beauchamp, A.; Wesemael, F.; Bergeron, P.; Fontaine, G.; Saffer, R. A.; Liebert, J.; Brassard, P.
Affiliation:
AA(CAE Électronique Ltée, 8585 Côte de Liesse, C.P. 1800, Saint-Laurent, Québec H4L 4X4, Canada; .), AB(Département de Physique, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec H3C 3J7, Canada; wesemael, brassard, fontaine@astro.umontreal.ca.), AC(Lockheed Martin Canada, 6111 Avenue Royalmount, Montréal, Québec H4P 1K6, Canada; bergeron@astro.umontreal.ca.), AD(Département de Physique, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec H3C 3J7, Canada; wesemael, brassard, fontaine@astro.umontreal.ca.), AE(Department of Astronomy and Astrophysics, Villanova University, Villanova, PA 19085; saffer@ast.vill.edu.), AF(Steward Observatory, University of Arizona, Tucson, AZ 85721; liebert@as.arizona.edu.), AG(Département de Physique, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec H3C 3J7, Canada; wesemael, brassard, fontaine@astro.umontreal.ca.)
Publication:
The Astrophysical Journal, Volume 516, Issue 2, pp. 887-891. (ApJ Homepage)
Publication Date:
05/1999
Origin:
APJ; UCP
Astronomy Keywords:
STARS: ATMOSPHERES, STARS: OSCILLATIONS, STARS: WHITE DWARFS, Stars: Atmospheres, Stars: Oscillations, Stars: White Dwarfs
Abstract Copyright:
(c) 1999: The American Astronomical Society
DOI:
10.1086/307148
Bibliographic Code:
1999ApJ...516..887B

Abstract

We have secured optical spectra for the eight currently known variable DB, or V777 Her, stars. With the help of a new generation of synthetic spectra, spectroscopic effective temperatures are derived for these objects, as well as for 15 other DB or DBA stars above 20,000 K. We find that the location of the boundaries of the instability strip is sensitive to the atmospheric hydrogen abundance assumed for DB stars: the strip covers the range 22,400-27,800 K if atmospheres of pure helium are used and the range 21,800-24,700 K if undetectable traces of hydrogen are allowed for in the DB models. These determinations provide independent constraints for current seismological analyses of the V777 Her stars. More sensitive searches for weak hydrogen features in hot DB stars should help decide between the two temperature scales.
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