Observations of the Pulsating White Dwarf G 185-32

B. G. Castanheira (1) , S. O. Kepler (1) , P. A. Moskalik (2) , S. Zola (3) , G. Pajdosz (3) , J. Krzesinski (3) , Darragh O'Donoghue (4) , M. Katz (4) , D. Buckley (4) , Gérard Vauclair (5) , N. Dolez (5) , Michel Chevreton (6, 7, 8) , Martin A. Barstow (9) , A. Kanaan (10) , O. Giovannini (11) , J. L. Provençal (12) , Steven D. Kawaler (13) , J. C. Clemens (14) , R. E. Nather (15) , D. E. Winget (15) , T. K. Watson (16) , K. Yanagida (15) , J. S. Dixson (15) , Candice J. Hansen (17) , P. A. Bradley (18) , M. A. Wood (19) , D. J. Sullivan (20) , S. J. Kleinman (21) , E. G. Meistas (22) , J.-E. Solheim (23) , A. Bruvold (23) , E. M. Leibowitz (24) , Tsevi Mazeh (24) , D. Koester (25) , M. H. Montgomery (26)

1 Instituto de Física, Universidade Federal do Rio Grande do Sul
2 CAMK - Centrum Astronomiczne im. M. Kopernika, Warszawa
3 Mount Suhora Observatory, Cracow Pedagogical University
4 SAAO - South African Astronomical Observatory
5 LATT - Laboratoire Astrophysique de Toulouse-Tarbes
6 DAEC - Departement d'Astrophysique Extragalactique et de Cosmologie
7 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
8 Pôle Astronomie du LESIA
9 Department of Physics and Astronomy, University of Leicester
10 Departamento de Física, Universidade Federal de Santa Catarina
11 Departamento de Física e Química, Universidade de Caxias do Sul
12 Department of Physics and Astronomy, University of Delaware
13 Department of Physics and Astronomy, Iowa State University
14 Department of Physics, University of North Carolina
15 University of Texas at Austin [Austin]
16 Southwestern University
17 JILA - University of Colorado, Joint Institute for Laboratory Astrophysics
18 LANL - Los Alamos National Laboratory
19 Department of Physics and Space Sciences and SARA Observatory, Florida Institute of Technology, Melbourne
20 Victoria University of Wellington
21 Sloan Digital Sky Survey, Apache Point Observatory, PO Box 59, Sunspot
22 Vilnius University [Vilnius]
23 Institutt for Fysikk, Universitetet i Tromsø
24 TAU - Tel Aviv University
25 Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel
26 IoA - Institute of Astronomy, University of Cambridge

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 T_eff=11 960 ± 80 K, \log g=8.02 ± 0.04 and M=0.617 ± 0.024 M_&sun;.

Domaines: Astrophysique [astro-ph]; Planète et Univers [physics]

B. G. Castanheira, S. O. Kepler, P. A. Moskalik, S. Zola, G. Pajdosz, et al.. Observations of the Pulsating White Dwarf G 185-32. Astronomy and Astrophysics - A&A, 2004, 413, pp.623-634. ⟨10.1051/0004-6361:20031567⟩. ⟨hal-03786097⟩