Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-03-30
J.Phys.Conf.Ser.172:012062,2009
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
8 pages, 6 figures, to appear in Journal of Physics Conference Proceedings for the 16th European White Dwarf Workshop
Scientific paper
10.1088/1742-6596/172/1/012062
We present a model atmosphere analysis of optical VRI and infrared JHK photometric data of about two dozen ZZ Ceti stars. We first show from a theoretical point of view that the resulting energy distributions are not particularly sensitive to surface gravity or to the assumed convective efficiency, a result which suggests a parameter-free effective temperature indicator for ZZ Ceti stars. We then fit the observed energy distributions with our grid of model atmospheres and compare the photometric effective temperatures with the spectroscopic values obtained from fits to the hydrogen line profiles. Our results are finally discussed in the context of the determination of the empirical boundaries of the ZZ Ceti instability strip.
Bergeron Pierre
Harris Hugh C.
Leggett Sandy K.
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