Journal Article

Seismological studies of ZZ Ceti stars – II. Application to the ZZ Ceti class

B. G. Castanheira and S. O. Kepler

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 396, issue 3, pages 1709-1731
Published in print July 2009 | ISSN: 0035-8711
Published online June 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14855.x
Seismological studies of ZZ Ceti stars – II. Application to the ZZ Ceti class

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We used the detected pulsation modes and adiabatic pulsation models to do seismology of the class of ZZ Ceti stars and measure the H layer mass for 83 stars. We found the surface hydrogen layer to be within the range 10−9.5MH/M*≥ 10−4, with an average of MH/M*= 10−6.3, which is thinner than the predicted value of MH/M*= 10−4, indicating that the stars lose more mass during their evolution than previously expected. These results are preliminary and do not include the possible effects of realistic C/O profiles on the fits.

Keywords: stars: individual: ZZ Ceti stars; stars: variables: other; white dwarfs

Journal Article.  11286 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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