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Asteroseismology of RXJ 2117+3412, the hottest pulsating PG 1159 star

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Asteroseismology of RXJ 2117+3412, the hottest pulsating PG 1159 star

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Título Asteroseismology of RXJ 2117+3412, the hottest pulsating PG 1159 star
Autor Vauclair, Gérard
Moskalik, Pawel
Pfeiffer, Ben
Chevreton, Michel
Dolez, Noël
Serre, B.
Kleinman, Scot James
Barstow, Martin A.
Sansom, A.E.
Solheim, Jan-Eric
Belmonte, J.A.
Kawaler, Steven D.
Kepler, Souza Oliveira
Kanaan Neto, Antonio Nemer
Giovannini Junior, Odilon
Winget, Donald Earl
Watson, Todd K.
Nather, R. Edward
Clemens, J. Christopher
Provencal, Judith L.
Dixson, James S.
Yanagida, K.
Nitta, Atsuko
Montgomery, Michael Houston
Klumpe, Eric W.
Bruvold, A.
O'Brien, M. Sean
Hansen, Carl J.
Grauer, Albert D.
Bradley, Paul A.
Wood, Matthew A.
Achilleos, Nicholas
Jiang, Shi Yang
Fu, Jianning Ning
Marar, T.M. Krishnan
Ashoka, B.N.
Meistas, Edmundas G.
Chernyshev, A.V.
Mazeh, Tsevi
Leibowitz, Elia M.
Hemar, Shirley
Krzesinski, Jerzy
Pajdosz, Gabriel
Zola, Staszek
Abstract The pulsating PG 1159 planetary nebula central star RXJ 2117+3412 has been observed over three successive seasons of a multisite photometric campaign. The asteroseismological analysis of the data, based on the 37 identified l = 1 modes among the 48 independent pulsation frequencies detected in the power spectrum, leads to the derivation of the rotational splitting, the period spacing and the mode trapping cycle and amplitude, from which a number of fundamental parameters can be deduced. The average rotation period is 1.16 ± 0.05 days. The trend for the rotational splitting to decrease with increasing periods is incompatible with a solid body rotation. The total mass is 0.56⁺⁰˙⁰²₋₀.₀₄ Mѳ and the He-rich envelope mass fraction is in the range 0.013–0.078 M*. The luminosity derived from asteroseismology is log(L/Lѳ) = 4.05⁺⁰˙²³₋₀.₃₂ and the distance 760⁺²³⁰₋₂₃₅ pc. At such a distance, the linear size of the planetary nebulae is 2.9 ± 0.9 pc. The role of mass loss on the excitation mechanism and its consequence on the amplitude variations is discussed.
Contido em Astronomy and astrophysics. Les Ulis. Vol. 381, no. 1 (Jan. 2002), p. 122-150
Assunto Anãs brancas
Estrelas
Estrelas variaveis
Fotometria estelar
Massa estelar
Material circum-estelar
Nebulosas planetarias
Processos internos estelares
Pulsacoes estelares
Rotacao estelar
Ventos estelares
[en] Stars: fundamental parameters
[en] Stars: individual (RXJ 2117+3412)
[en] Stars: oscillations
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/98757
Arquivos Descrição Formato
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