The Pulsating DA White Dwarf Star EC 14012-1446

Details The Pulsating DA White Dwarf Star EC 14012-1446 The Pulsating DA White Dwarf Star EC 14012-1446

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..334..569h&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

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Scientific paper

We analyse the pulsation spectrum of the high-amplitude DAV star EC 14012-1446 derived from two observing runs. We detect seven pulsation frequencies that we suggest to be consecutive radial overtones of ℓ=1 modes. The mean period spacing of the eigenmodes (53.8 ± 2.3 s) implies a mass of 0.48 ± 0.03 Msun, inconsistent with spectroscopic log g determinations.
Our mode identification is corroborated by an analysis of the combination frequencies. Several of the eigenmodes seem to be part of rotationally split multiplets (Δ ν =10.2 ± 0.2 μHz), with the exception of one doublet whose splitting is only 6.3 μHz. However, we have no reason to believe that this mode is ℓ=1 and the others are ℓ=2 and speculate it may be a trapped mode.

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