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Whole Earth Telescope observations of BPM 37093 : a seismological test of crystallization theory in white dwarfs

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Whole Earth Telescope observations of BPM 37093 : a seismological test of crystallization theory in white dwarfs

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Título Whole Earth Telescope observations of BPM 37093 : a seismological test of crystallization theory in white dwarfs
Autor Kanaan Neto, Antonio Nemer
Nitta, Atsuko
Winget, Donald Earl
Kepler, Souza Oliveira
Montgomery, Michael Houston
Metcalfe, Travis S.
Oliveira, H.
Fraga, Luciano
Costa, Alex Fabiano Murillo da
Costa, Jose Eduardo da Silveira
Castanheira, Bárbara Garcia
Giovannini Junior, Odilon
Nather, R. Edward
Mukadam, Anjum Shagufta
Kawaler, Steven D.
O'Brien, M. Sean
Reed, M. D.
Kleinman, Scot James
Provencal, Judith L.
Watson, Todd K.
Kilkenny, Dave
Sullivan, Denis J.
Sullivan, Terry
Shobbrook, Bob
Jiang, Xiaojun
Ashoka, B.N.
Seetha, S.
Leibowitz, Elia M.
Ibbetson, Peter A.
Mendelson, Haim
Meistas, Edmundas G.
Kalytis, Romualdas
Alisauskas, Darius
O'Donoghue, Darragh
Buckley, David A.H.
Martinez, Peter
Van Wyk, Francois
Stobie, Robert S.
Marang, Fred
Van Zyl, L.
Ogloza, Waldemar
Krzesinski, Jerzy
Zola, Staszek
Moskalik, Pawel
Breger, M.
Stankov, A.
Silvotti, Roberto
Piccioni, Adalberto
Vauclair, Gérard
Dolez, Noël
Chevreton, Michel
Deetjen, Jochen L.
Dreizler, Stefan
Schuh, Sonja L.
Gonzalez Perez, Jose Miguel
Ostensen, Roy
Ulla, Ana
Manteiga, Minia
Suarez, Olga
Burleigh, Matt
Barstow, Martin A.
Abstract BPM 37093 is the only hydrogen-atmosphere white dwarf currently known which has sufficient mass (~1.1 Mʘ) to theoretically crystallize while still inside the ZZ Ceti instability strip (Teff ~ 12 000 K). As a consequence, this star represents our first opportunity to test crystallization theory directly. If the core is substantially crystallized, then the inner boundary for each pulsation mode will be located at the top of the solid core rather than at the center of the star, affecting mainly the average period spacing. This is distinct from the “mode trapping” caused by the stratified surface layers, which modifies the pulsation periods more selectively. In this paper we report on Whole Earth Telescope observations of BPM 37093 obtained in 1998 and 1999. Based on a simple analysis of the average period spacing we conclude that a large fraction of the total stellar mass is likely to be crystallized.
Contido em Astronomy and astrophysics. Les Ulis. Vol. 432, no. 1 (Mar. 2005), p. 219-224
Assunto Anãs brancas
Estrelas variaveis
Evolucao estelar
Hidrogenio
Interior estelar
Massa estelar
Pulsacoes estelares
[en] Stars: evolution
[en] Stars: individual: BPM 37093
[en] Stars: interiors
[en] Stars: oscillations
[en] White dwarfs
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/98773
Arquivos Descrição Formato
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