HST observations of the pulsating white dwarf GD 358

Details HST observations of the pulsating white dwarf GD 358 HST observations of the pulsating white dwarf GD 358

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...432..175c&link_type=abstract

Astronomy and Astrophysics, Volume 432, Issue 1, March II 2005, pp.175-179

Astronomy and Astrophysics

Astrophysics

10

Stars: White Dwarfs, Stars: Variables: General, Stars: Oscillations, Stars: Individual: Gd 358, Stars: Evolution

Scientific paper

We used time-resolved ultraviolet spectroscopy obtained with the FOS and STIS spectrographs of the Hubble Space Telescope (HST), together with archival IUE observations to measure the effective temperature (Teff), surface gravity (log g) and distance (d) of the pulsating DB white dwarf GD 358 with unprecedented accuracy, and to show that the temperature did not change during the 1996 sforzando, when the star changed basically to a single mode pulsator. We also measured for the first time for a DBV the spherical harmonic degree (ℓ) for two modes, with k=8 and k=9, which was only possible because the stellar light curve was dominated by a single mode in 1996. The independent spectra provide the following values: Teff=24 100± 400 K, log g=7.91±0.26 and d=42.7±2.5 pc. The ultraviolet spectroscopic distance is in better agreement with the seismological value, than the one derived by parallax.

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