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Whole Earth Telescope observations and seismological analysis of the pre-white dwarf pg 2131+066

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Whole Earth Telescope observations and seismological analysis of the pre-white dwarf pg 2131+066

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Título Whole Earth Telescope observations and seismological analysis of the pre-white dwarf pg 2131+066
Autor Kawaler, Steven D.
O'Brien, M. Sean
Clemens, J. Christopher
Nather, R. Edward
Winget, Donald Earl
Watson, Todd K.
Yanagida, K.
Dixson, James S.
Bradley, Paul A.
Wood, Matthew A.
Sullivan, Denis J.
Kleinman, Scot James
Meistas, Edmundas G.
Leibowitz, Elia M.
Moskalik, Pawel
Zola, Staszek
Pajdosz, Y.
Krzesinski, Jerzy
Solheim, Jan-Eric
Bruvold, A.
O'Donoghue, Darragh
Katz, M.
Vauclair, Gérard
Dolez, Noël
Chevreton, Michel
Barstow, Martin A.
Kanaan Neto, Antonio Nemer
Kepler, Souza Oliveira
Giovannini Junior, Odilon
Provencal, Judith L.
Hansen, Carl J.
Abstract As transition objects between the asymptotic giant branch (AGB) and cooling white dwarfs, the PG 1159 stars are key objects for understanding the late stages of stellar evolution. The pulsations exhibited by many members of the PG 1159 spectral class provide a mechanism for ferreting out this information. We present an analysis of the pulsation spectrum of the naked PG 1159 star PG 2131 +066, which we completely resolve using data from the Whole Earth Telescope (WET). The pulsation spectrum shows patterns that are expected from pulsation theory; comparison of these patterns with theoretical models indicate that PG 2131 has a mass of 0.61 ± 0.02 Mʘ, a luminosity of log (L/Lʘ) = 1.0 ± 0.2, and it lies ata distance of 470 +470 - 130pc. lt rotates with a period of 5.1 hr and shows evidence of a discontinuity in composition approximately 6 x 10- 3M* below the surface. Certain modes show complex structure in the power spectrum, while others show measur­ able frequency changes in 8 years. Fine structure in the prograde (m = -1) modes suggests the presence of nonlinear effects.
Contido em The astrophysical journal. Chicago. Vol. 450, no. 1, pt. 1 (Sept. 1995), p. 350-363
Assunto Anãs brancas
Estrelas variaveis
Massa estelar
Pulsacoes estelares
Radiação estelar
[en] Stars: fundamental parameters
[en] Stars: individual (PG 2131 +066)
[en] Stars: oscillations
[en] White dwarfs
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108728
Arquivos Descrição Formato
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