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Whole Earth Telescope observations of the subdwarf B star KPD 1930+2752: a rich, short-period pulsator in a close binary
Reed, M. D.1; Harms, S. L.1; Poindexter, S.1,2; Zhou, A. -Y.1,3; Eggen, J. R.1; Morris, M. A.1,4; Quint, A. C.1; McDaniel, S.1; Baran, A.5; Dolez, N.6; Kawaler, S. D.7; Kurtz, D. W.8; Moskalik, P.9; Riddle, R.7,10; Zola, S.5,11; Ostensen, R. H.12,13; Solheim, J. -E.14; Kepler, S. O.15; Costa, A. F. M.16; Provencal, J. L.17,18; Mullally, F.19,20; Winget, D. W.19,20; Vuckovic, M.7,13; Crowe, R.21; Terry, D.21; Avila, R.21,22; Berkey, B.21,23; Stewart, S.21; Bodnarik, J.21,24; Bolton, D.21; Binder, P. -M.21; Sekiguchi, K.25; Sullivan, D. J.26; Kim, S. -L.27; Chen, W. -P.28; Chen, C. -W.28; Lin, H. -C.28; Jian, X. -J.29,30; Wu, H.29,30; Gou, J. -P.29,30; Liu, Z.29,30; Leibowitz, E.31; Lipkin, Y.31; Akan, C.32; Cakirli, O.32; Janulis, R.33; Pretorius, R.34; Ogloza, W.5; Stachowski, G.5; Paparo, M.35; Szabo, R.35; Csubry, Z.35; Zsuffa, D.35; Silvotti, R.36; Marinoni, S.37,38; Bruni, I.38; Vauclair, G.6; Chevreton, M.39; Matthews, J. M.40; Cameron, C.40; Pablo, H.7
AbstractKPD 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 mu Hz (periods between 326 and 157 s). We examine pulsation properties including phase and amplitude stability in an attempt to understand the nature of the pulsation mechanism. 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 (approximate to 16 h) amplitude variability, rotationally split modes, tidally induced modes and some pulsations which are geometrically limited on the sdB star.
KeywordBinaries: Close Stars: General Stars: Oscillations Subdwarfs Oscillations: Individual: Kpd 1930+2752
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WOS IDWOS:000288378100032
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Affiliation1.Missouri State Univ, Dept Phys Astron & Mat Sci, Springfield, MO 65897 USA
2.Ohio State Univ, Dept Astron, Columbus, OH 43210 USA
3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
4.Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA
5.Pedag Univ, Mt Suhora Observ, PL-30084 Krakow, Poland
6.Univ Toulouse, CNRS, Lab Astrophys Toulouse Tarbes, F-31400 Toulouse, France
7.Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
8.Univ Cent Lancashire, Ctr Astrophys, Preston PR1 2HE, Lancs, England
9.Nicolaus Copernicus Astron Ctr, PL-00716 Warsaw, Poland
10.CALTECH, Pasadena, CA 91125 USA
11.Jagiellonian Univ, Astron Observ, PL-30244 Krakow, Poland
12.Isaac Newton Grp Telescopes, Santa Cruz De La Palma 37800, Spain
13.Katholieke Univ Leuven, Inst Sterrenkunde, B-3001 Louvain, Belgium
14.Univ Oslo, Inst Teoret Astrofysikk, N-0212 Blindern Oslo, Norway
15.Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil
16.Univ Estado Santa Catarina, CAV, BR-88520000 Lages, SC, Brazil
17.Univ Delaware, Newark, DE 19716 USA
18.Mt Cuba Observ, Newark, DE 19716 USA
19.Univ Texas Austin, Dept Astron, Austin, TX 78712 USA
20.Univ Texas Austin, McDonald Observ, Austin, TX 78712 USA
21.Univ Hawaii, Dept Phys & Astron, Hilo, HI 96720 USA
22.New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA
23.WM Keck Observ, Kamuela, HI 96743 USA
24.Gemini Observ, Hilo, HI 96720 USA
25.Natl Inst Nat Sci, Natl Astron Observ Japan, Subaru Observ, Hilo, HI 96720 USA
26.Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington, New Zealand
27.Korea Astron Observ, Taejon 305348, South Korea
28.Natl Cent Univ, Grad Inst Astron, Chungli 32054, Taiwan
29.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
30.Chinese Acad Sci, Joint Lab Opt Astron, Beijing 100012, Peoples R China
31.Tel Aviv Univ, Wise Observ, IL-69978 Tel Aviv, Israel
32.Ege Univ Observ, TR-35100 Izmir, Turkey
33.Vilnius State Univ, Inst Theoret Phys & Astron, LT-01108 Vilnius, Lithuania
34.S African Astron Observ, ZA-7935 Observatory, South Africa
35.Konkoly Observ Budapest, H-1525 Budapest XII, Hungary
36.Osserv Astron Torino, INAF, I-10025 Pino Torinese, Italy
37.Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy
38.Osservatorio Astron Bologna, INAF, I-40127 Bologna, Italy
39.Observ Paris, LESIA, F-92190 Meudon, France
40.Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada
Recommended Citation
GB/T 7714
Reed, M. D.,Harms, S. L.,Poindexter, S.,et al. Whole Earth Telescope observations of the subdwarf B star KPD 1930+2752: a rich, short-period pulsator in a close binary[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,412(1):371-390.
APA Reed, M. D..,Harms, S. L..,Poindexter, S..,Zhou, A. -Y..,Eggen, J. R..,...&Pablo, H..(2011).Whole Earth Telescope observations of the subdwarf B star KPD 1930+2752: a rich, short-period pulsator in a close binary.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,412(1),371-390.
MLA Reed, M. D.,et al."Whole Earth Telescope observations of the subdwarf B star KPD 1930+2752: a rich, short-period pulsator in a close binary".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 412.1(2011):371-390.
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