The pulsation properties of the DA white dwarf variables

Details The pulsation properties of the DA white dwarf variables The pulsation properties of the DA white dwarf variables

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993balta...2..407c&link_type=abstract

Baltic Astronomy, vol. 2, p. 407

Astronomy and Astrophysics

Astronomy

41

White Dwarf Stars, Stellar Oscillations, Stellar Temperature, Stellar Mass, Ionization

Scientific paper

We have combined all the WET (Whole Earth Telescope) data acquired on DAV stars with published single-site data in order to explore the relationships between effective temperature, pulsation period, and pulsation amplitude. As expected from theory, the hottest DAVs have the shortest periods and smallest amplitudes. Both quantities increase monotonically with decreasing temperature. More surprising, we have found that the power spectra of all the DAV stars are strikingly similar. We interpret this as evidence for a very small range of total mass and hydrogen layer mass in the DAVs. Using clues from the pulsation spectra of various DAV stars, we have been able to identify the common mode pattern discovered as a sequence of l = 1 modes. The published models which best reproduce the modes identified have hydrogen layer masses near 10 exp -4 M*, the value expected from models of DA formation in which nuclear burning is the dominant process fixing the hydrogen layer mass.

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