Other
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..334..471t&link_type=abstract
14th European Workshop on White Dwarfs, ASP Conference Series, Vol. 334 Proceedings of a meeting held at Kiel, July 19-23, 2004
Other
Scientific paper
Optical time-series spectroscopy of pulsating white dwarf stars has the potential to identify the spherical degrees of individual pulsation modes. We introduce a new analysis technique that improves our ability to measure the line shape variations and consequently the identity of the modes. We show the analysis of time-series spectra of three stars: PY Vul, G 226-29, and EC 23487-2424. Most notably, the results of our analysis of PY Vul provides a solution to all the peculiar aspects of the pulsations that have set this star apart from the other DAVs. These aspects include low pulsation amplitudes, a harmonic mode that exceeds the amplitude of its fundamental, and a mode with unexplained UV amplitudes. The addition of our optical time-series spectra reveals that the mode with unusual UV amplitudes has line profile variations consistent with a spherical degree of four. We discuss how all the observations of this star are accounted for by PY Vul being dominated by an ℓ=4 mode, and propose this hypothesis as a solution to the mysteries of PY Vul.
Clemens James Christopher
Koester Detlev
Thompson Sally E.
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