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Whole Earth Telescope observations of the subdwarf B star KPD1930+2752 : a rich, short-period pulsator in a close binary

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Whole Earth Telescope observations of the subdwarf B star KPD1930+2752 : a rich, short-period pulsator in a close binary

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Título Whole Earth Telescope observations of the subdwarf B star KPD1930+2752 : a rich, short-period pulsator in a close binary
Autor Reed, M. D.
Harms, S. L.
Poindexter, S.
Zhou, Ai-Ying
Eggen, J.
Morris, M. A.
Quint, A. C.
McDaniel, S.
Baran, Andrzej
Dolez, Noël
Kawaler, Steven D.
Kurtz, Donald W.
Moskalik, Pawel
Riddle, Reed L.
Zola, Staszek
Ostensen, Roy
Solheim, Jan-Eric
Kepler, Souza Oliveira
Costa, Alex Fabiano Murillo da
Provencal, Judith L.
Mullally, Fergal
Winget, Donald Earl
Vuckovic, Maja
Crowe, Richard A.
Terry, D.
Avila, R.
Berkey, B.
Stewart, S.
Bodnarik, J.
Bolton, D.
Binder, Philippe M.
Sekiguchi, Kazuhiro
Sullivan, Denis J.
Kim, Seung-Lee
Chen, Wen-Ping
Chen, C.-W.
Lin, Hung-Chin
Jiang, Xiaojun
Wu, H.
Gou, J.-P.
Liu, Z.
Leibowitz, Elia M.
Lipkin, Y.
Akan, Mustafa Can
Cakirli, Ö
Janulis, Rimvydas
Pretorius, R.
Ogloza, Waldemar
Stachowski, G.
Paparo, Margit
Szabó, R.
Csubry, Z.
Zsuffa, D.
Silvotti, Roberto
Marinoni, S.
Bruni, I.
Vauclair, Gérard
Chevreton, Michel
Matthews, Jaymie M.
Cameron, C.
Pablo, H.
Abstract KPD 1930+2752 is a short-period pulsating subdwarf B (sdB) star. It is also an ellipsoidal variable with a known binary period of 2.3 h. The companion is most likely a white dwarf and the total mass of the system is close to the Chandresekhar limit. In this paper, we report the results of Whole Earth Telescope (WET) photometric observations during 2003 and a smaller multisite campaign of 2002. From 355 h of WET data, we detect 68 pulsation frequencies and suggest an additional 13 frequencies within a crowded and complex temporal spectrum between 3065 and 6343 μHz (periods between 326 and 157 s). We examine pulsation properties including phase and amplitude stability in an attempt to understand the nature of the pulsationmechanism.We examine a stochastic mechanism by comparing amplitude variations with simulated stochastic data. We also use the binary nature of KPD 1930+2752 for identifying pulsation modes via multiplet structure and a tidally induced pulsation geometry. Our results indicate a complicated pulsation structure that includes short-period (≈16 h) amplitude variability, rotationally split modes, tidally induced modes and some pulsations which are geometrically limited on the sdB star.
Contido em Monthly notices of the royal astronomical society. Oxford. Vol. 412, no. 1 (Mar. 2011), p. 371-390
Assunto Anãs brancas
Oscilacoes
Pulsacoes estelares
[en] Bbinaries: close
[en] Oscillations: individual: KPD 1930+2752
[en] Stars: general
[en] Stars: oscillations
[en] Subdwarfs
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/93351
Arquivos Descrição Formato
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