Observations of the pulsating white dwarf G 185-32

• Autor(a) principal: Castanheira, Bárbara Garcia
• Data de Publicação: 2004
• Outros Autores: Kepler, Souza Oliveira, Moskalik, Pawel, Zola, Staszek, Pajdosz, Gabriel, Krzesinski, Jerzy, O'Donoghue, Darragh, Katz, M., Buckley, David A.H., Vauclair, Gérard, Dolez, Noël, Chevreton, Michel, Barstow, Martin A., Kanaan Neto, Antonio Nemer, Giovannini Junior, Odilon, Provencal, Judith L., Kawaler, Steven D., Clemens, J. Christopher, Nather, R. Edward, Winget, Donald Earl, Watson, Todd K., Yanagida, K., Dixson, James S., Hansen, Carl J., Bradley, Paul A., Wood, Matthew A., Sullivan, Denis J., Kleinman, Scot James, Meistas, Edmundas G., Solheim, Jan-Eric, Bruvold, A., Leibowitz, Elia M., Mazeh, Tsevi, Koester, D., Montgomery, Michael Houston
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/98518
• topic: Atmosferas estelares; Evolucao estelar; Fotometria estelar; Pulsacoes estelares; Anãs brancas; Transformada de Fourier; Stars: white dwarfs; Stars: variables: general; Stars: oscillations; Stars: individual: G 185–32; Stars: evolution

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 ( ) 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 .