A detection of the evolutionary time scale of the da white dwarf G117-B15A with the Whole Earth Telescope

We have detected the time rate of change for the main pulsation period of the 13,000 K DA white dwarf G117-B15A, using the Whole Earth Telescope (WET). The observed rate of period change, P = (12.0 ± 3.5) x 10- 15 s s - ', is somewhat larger than the published theoretical calculations of the ra...

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Detalhes bibliográficos
Autores: Kepler, Souza Oliveira, Winget, Donald Earl, Nather, R. Edward, Bradley, Paul A., Grauer, Albert D., Fontaine, Gilles, Bergeron, Pierre, Vauclair, Gérard, Claver, C.F., Marar, T.M. Krishnan, Seetha, S., Ashoka, B.N., Mazeh, Tsevi, Leibowitz, Elia M., Dolez, Noël, Chevreton, Michel, Barstow, Martin A., Clemens, J. Christopher, Kleinman, Scot James, Sansom, A.E., Tweedy, R.W., Hine, B.P., Provencal, Judith L., Wesemael, F., Wood, Matthew A., Brassard, P., Solheim, Jan-Eric, Emanuelsen, P.-I., Kanaan Neto, Antonio Nemer
Formato: artículo
Estado:Versión publicada
Fecha de publicación:1991
País:Brasil
Recursos:Universidade Federal do Rio Grande do Sul (UFRGS)
Repositorio:Repositório Institucional da UFRGS
Idioma:inglés
OAI Identifier:oai:www.lume.ufrgs.br:10183/108717
Acesso em linha:http://hdl.handle.net/10183/108717
Access Level:acceso abierto
Palavra-chave:Anãs brancas
Evolucao estelar
Pulsacoes estelares
Estrelas binarias
Estrelas variaveis
Fotometria estelar
Observações astronômicas no visível
Stars: evolution
Stars: variables
Stars: white dwarfs
Descrição
Resumo:We have detected the time rate of change for the main pulsation period of the 13,000 K DA white dwarf G117-B15A, using the Whole Earth Telescope (WET). The observed rate of period change, P = (12.0 ± 3.5) x 10- 15 s s - ', is somewhat larger than the published theoretical calculations of the rate of period change due to cooling, based on carbon core white dwarf models. We discuss other effects that could contribute to the observed rate of period change.

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