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Whole Earth Telescope observations of the pulsating subdwarf B star PG 0014+067

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Whole Earth Telescope observations of the pulsating subdwarf B star PG 0014+067

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Título Whole Earth Telescope observations of the pulsating subdwarf B star PG 0014+067
Autor Vuckovic, Maja
Kawaler, Steven D.
O'Toole, Simon
Csubry, Z.
Baran, Andrzej
Zola, Staszek
Moskalik, Pawel
Klumpe, Eric W.
Riddle, Reed L.
O'Brien, M. Sean
Mullally, Fergal
Wood, Matthew A.
Wilkat, Vanessa
Zhou, Ai-Ying
Reed, M. D.
Terndrup, Donald M.
Sullivan, Denis J.
Kim, Seung-Lee
Chen, Wen-Ping
Chen, C.-W.
Hsiao, Wen-Shan
Kausharbanu, Sanchawala
Lee, Hsu-Tai
Jiang, Xiaojun
Janulis, Rimvydas
Siwak, Michal
Ogloza, Waldemar
Paparo, Margit
Bognár, Zsófia
Sódor, Ádám
Handler, Gerald
Lorenz, Denise
Steininger, Bruno
Silvotti, Roberto
Vauclair, Gérard
Oreiro, Raquel
Ostensen, Roy
Bronowska, A.
Castanheira, Bárbara Garcia
Kepler, Souza Oliveira
Fraga, Luciano
Shipman, Harry L.
Provencal, Judith L.
Childers, D.
Abstract PG 0014+067 is one of the most promising pulsating subdwarf B stars for seismic analysis, as it has a rich pulsation spectrum. The richness of its pulsations, however, poses a fundamental challenge to understanding the pulsations of these stars, as the mode density is too complex to be explained only with radial and nonradial low-degree (l< 3) p-modes without rotational splittings. One proposed solution, suggested by Brassard et al. in 2001 for the case of PG 0014+067 in particular, assigns some modes with high degree (l=3). On the other hand, theoretical models of sdB stars suggest that they may retain rapidly rotating cores, and so the high mode density may result from the presence of a few rotationally split triplet (l = 1) and quintuplet (l = 2) modes, along with radial (l = 0) p-modes. To examine alternative theoretical models for these stars, we need better frequency resolution and denser longitude coverage. Therefore, we observed this star with the Whole Earth Telescope for two weeks in 2004 October. In this paper we report the results of Whole Earth Telescope observations of the pulsating subdwarf B star PG 0014+067.We find that the frequencies seen in PG 0014+067 do not appear to fit any theoretical model currently available; however, we find a simple empirical relation that is able to match all of the well-determined frequencies in this star.
Contido em The astrophysical journal. Chicago. Vol. 646, no. 2, pt. 1 (Aug. 2006), p. 1230-1240
Assunto Anãs brancas
Observacoes astronomicas
Pulsacoes estelares
Telescopios
[en] Stars: individual (PG 0014+067)
[en] Stars: oscillations
[en] Subdwarfs
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108919
Arquivos Descrição Formato
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