Whole earth telescope observations of the pulsating hot white dwarf PG 1707+427
![Thumbnail](/bitstream/handle/10183/98766/000504047.pdf.jpg?sequence=3&isAllowed=y)
Visualizar/abrir
Data
2004Autor
Tipo
Assunto
Abstract
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 pul ...
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 l = 1 modes, with a common period spacing of 23.0 s. This spacing implies that the mass of PG 1707+427 is 0.57 Mѳ. Preliminary model fits suggest that the mass determined via asteroseismology is consistent with the mass determined from spectroscopy combined with evolutionary tracks. ...
Contido em
Astronomy and Astrophysics. Berlin. Vol. 428, no. 3 (Dec. 2004), p. 969-981
Origem
Estrangeiro
Coleções
-
Artigos de Periódicos (39401)Ciências Exatas e da Terra (5976)
Este item está licenciado na Creative Commons License
![](/themes/Mirage2Novo//images/lume/cc.png)