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

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 onl...

ver descrição completa

Detalhes bibliográficos
Autores: 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.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2006
País:Brasil
Recursos:Universidade Federal do Rio Grande do Sul (UFRGS)
Repositorio:Repositório Institucional da UFRGS
Idioma:inglés
OAI Identifier:oai:www.lume.ufrgs.br:10183/108919
Acesso em linha:http://hdl.handle.net/10183/108919
Access Level:acceso abierto
Palavra-chave:Pulsacoes estelares
Anãs brancas
Observacoes astronomicas
Telescopios
Stars: individual (PG 0014+067)
Stars: oscillations
Subdwarfs
Descrição
Resumo: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.

Registos relacionados