Volume 428, Number 3, December IV 2004
|Page(s)||969 - 981|
|Section||Stellar structure and evolution|
|Published online||07 December 2004|
Whole Earth Telescope observations of the pulsating hot white dwarf PG 1707+427
Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA e-mail: email@example.com
2 School of Physics, University of Sydney, Sydney NSW, Australia
3 Dr. Remeis-Sternwarte, Astronomisches Institut der Universität Erlangen-Nürnberg, Sternwartstr. 7, Bamberg 96049, Germany
4 Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599-3255, USA
5 Department of Astronomy, Yale University, New Haven, CT 06851, USA
6 Department of Physics and Astronomy, University of Arkansas at Little Rock, Little Rock, AR 72204, USA
7 Department of Astronomy, University of Texas, Austin, TX 78712, USA
8 Nicolas Copernicus Astronomical Center, Polish Academy of Sciences, ul. Bartycka 18, 00-716 Warsaw, Poland
9 National Optical Astronomy Observatory, 950 N. Cherry Ave, Tucson, AZ 85719, USA
10 Département de Physique, Université de Montréal, Montréal, Québec, H3C 3J7, Canada
11 Université Paul Sabatier, Observatoire Midi-Pyrénées, 14 avenue E. Belin, 31400 Toulouse, France
12 Observatoire de Paris-Meudon, DAEC, 92195 Meudon, France
13 Apache Point Observatory, PO Box 59, Sunspot, NM 88349, USA
14 Southwestern University, 1001 E. University Avenue, Georgetown, TX 78626, USA
15 Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK
16 Isaac Newton Group of Telescopes, 37800 Santa Cruz de La Palma, Canary Islands, Spain
17 Centre for Astrophysics, University of Central Lancashire, Preston, Lancashire, PR1 2HE, UK
18 Instituto de Física, UFRGS, Campus do Vale, CP 15051 Porto Alegre, RS, Brazil
19 Departamento de Física, Universidade Federal de Santa Catarina, CP 4796-CDP 88040-900 Florianópolis, SC-Brazil
20 Los Alamos National Laboratory, X-2, MS T-085, Los Alamos, NM 87545, USA
21 Department of Physics and Astronomy, University of Delaware, 223 Sharp Laboratory, Newark, DE 19716, USA
Accepted: 27 August 2004
We report on the analysis of multisite time-series photometry of the pulsating pre-white dwarf (GW Vir star) PG 1707+427, obtained by the Whole Earth Telescope collaboration. This is the last of the known GW Vir stars without surrounding nebulae to be resolved by multisite data. Successful resolution of the pulsation spectrum resulted from the combination of high signal-to-noise observations with a large telescope and wide coverage in longitude with smaller telescopes. We find a series of 8 pulsation frequencies (along with two nonlinear combination frequencies), and identify 7 of them as part of a sequence of modes, with a common period spacing of 23.0 s. This spacing implies that the mass of PG 1707+427 is . Preliminary model fits suggest that the mass determined via asteroseismology is consistent with the mass determined from spectroscopy combined with evolutionary tracks.
Key words: stars: evolution / stars: white dwarfs / stars: oscillations / stars: individual: PG 1707+427
© ESO, 2004
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