Observations of the Pulsating White Dwarf G 185-32
Mazeh, T.; Hansen, C. J.; Kepler, S. O.; Kawaler, S. D.; Montgomery, M. H.; Winget, D. E.; Clemens, J. C.; Barstow, M. A.; Koester, D.; Vauclair, G.; Solheim, J. -E.; O'Donoghue, D.; Kanaan, A.; Bradley, P. A.; Kleinman, S. J.; Moskalik, P.; Dolez, N.; Sullivan, D. J.; Watson, T. K.; Nather, R. E.; Giovannini, O.; Buckley, D.; Pajdosz, G.; Wood, M. A.; Castanheira, B. G.; Zoła, S.; Krzesiński, J.; Katz, M.; Chevreton, M.; Provencal, J.; Yanagida, K.; Dixson, J. S.; Meistas, E.; Bruvold, A.; Leibowitz, E.
Brazil, Poland, South Africa, France, United Kingdom, United States, New Zealand, Lithuania, Norway, Israel, Germany
Abstract
We observed the pulsating hydrogen atmosphere white dwarf G 185-32 with the Whole Earth Telescope in 1992. We report on a weighted Fourier transform of the data detecting 18 periodicities in its light curve. Using the Hubble Space Telescope Faint Object Spectrograph time resolved spectroscopy, and the wavelength dependence of the relative amplitudes, we identify the spherical harmonic degree (ℓ) for 14 pulsation signals. We also compare the determinations of effective temperature and surface gravity using the excited modes and atmospheric methods, obtaining Teff=11 960 ± 80 K, \log g=8.02 ± 0.04 and M=0.617 ± 0.024 M⊙.