Mode identification of Pulsating White Dwarfs using the HST

Details Mode identification of Pulsating White Dwarfs using the HST Mode identification of Pulsating White Dwarfs using the HST

2000-03-31

arxiv.org/abs/astro-ph/0003475v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in the Astrophysical Journal, Aug 2000

Scientific paper

10.1086/309226

We have obtained time-resolved ultraviolet spectroscopy for the pulsating DAV stars G226-29 and G185-32, and for the pulsating DBV star PG1351+489 with the Hubble Space Telescope Faint Object Spectrograph, to compare the ultraviolet to the optical pulsation amplitude and determine the pulsation indices. We find that for essentially all observed pulsation modes, the amplitude rises to the ultraviolet as the theoretical models predict for l=1 non-radial g-modes. We do not find any pulsation mode visible only in the ultraviolet, nor any modes whose phase flips by 180 degrees; in the ultraviolet, as would be expected if high l pulsations were excited. We find one periodicity in the light curve of G185-32, at 141 s, which does not fit theoretical models for the change of amplitude with wavelength of g-mode pulsations.

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