Seismological studies of ZZ Ceti stars – II. Application to the ZZ Ceti class |
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| Authors: | B G Castanheira S O Kepler |
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| Institution: | Departamento de Astronomia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500 Porto Alegre 91501-970, RS, Brazil;Institut für Astronomie, Türkenschanzstr. 17, A-1180 Wien, Austria |
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| Abstract: | 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?9.5≥ M H/ M *≥ 10?4 , with an average of M H/ M *= 10?6.3 , which is thinner than the predicted value of M H/ 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. |
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| Keywords: | stars: individual: ZZ Ceti stars stars: variables: other white dwarfs |
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