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Asteroseismology of a star cooled by neutrino emission : the pulsating pre-white dwarf PG 0122+200

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Asteroseismology of a star cooled by neutrino emission : the pulsating pre-white dwarf PG 0122+200

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Título Asteroseismology of a star cooled by neutrino emission : the pulsating pre-white dwarf PG 0122+200
Autor O'Brien, M. Sean
Vauclair, Gérard
Kawaler, Steven D.
Watson, Todd K.
Winget, Donald Earl
Nather, R. Edward
Montgomery, Michael Houston
Nitta, Atsuko
Kleinman, Scot James
Sullivan, Denis J.
Jiang, Xiaojun
Marar, T.M. Krishnan
Seetha, S.
Ashoka, B.N.
Bhattacharya, J.
Leibowitz, Elia M.
Hemar, Shirley
Ibbetson, Peter A.
Warner, B.
Van Zyl, L.
Moskalik, Pawel
Zola, Staszek
Pajdosz, Gabriel
Krzesinski, Jerzy
Dolez, Noël
Chevreton, Michel
Solheim, Jan-Eric
Thomassen, T.
Kepler, Souza Oliveira
Giovannini Junior, Odilon
Provencal, Judith L.
Wood, Matthew A.
Clemens, J. Christopher
Abstract Observation of g-mode pulsations in the variable pre-white dwarf (GW Virginis) stars provides a unique means to probe their interiors and to study the late stages of stellar evolution. Multisite campaigns have in several cases proved highly successful in decoding preÈwhite dwarf light curves. Three previous attempts to untangle the pulsation spectrum of the coolest GW Virginis star, PG 0122+200, confirmed the existence of multiple g-modes but left the fundamental period spacing and therefore the star's mass and luminosity in doubt. We present an analysis based on new observations of PG 0122+200 obtained during a Whole Earth Telescope (WET) campaign conducted in the fall of 1996. Although our coverage was, because of bad weather, far poorer than in previous WET campaigns, we confirm the previous result that PG 0122+200 rotates once in 1.6±0.1 days. The most likely period spacing supported by the data implies a mass of 0.69±0.03 Mʘ. Based on the best seismology we can currently do, the cooling of PG 0122+200 is dominated by neutrino losses. This is not true for all pre-white dwarf stars and makes PG 0122+200 the prime candidate for learning useful physics. Constraints placed on the cooling rate of PG 0122+200 by future measurement of dII/dt could provide a unique test of the standard theory of lepton interactions in the (experimentally unexplored) region of phase-space appropriate to pre-white dwarf interiors.
Contido em The Astrophysical journal. Chicago. Vol. 495, no. 1 pt. 1 (Mar. 1998), p. 458-467
Assunto Anãs brancas
Estrelas variaveis
Fotometria estelar
Luminosidade
Massa atômica
Pulsacoes estelares
Radiação estelar
Rotação
Rotacao estelar
[en] Elementary particles
[en] Stars : individual (PG 0122+200)
[en] Stars : interiors
[en] Stars : pulsars : general
[en] Stars : white dwarfs
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108873
Arquivos Descrição Formato
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