Whole Earth Telescope observations of the subdwarf B star KPD 1930+2752: a rich, short-period pulsator in a close binary

NCU Institutional Repository > 理學院 > 天文研究所 > 期刊論文 > Item 987654321/50944

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/50944

题名:	Whole Earth Telescope observations of the subdwarf B star KPD 1930+2752: a rich, short-period pulsator in a close binary
作者:	Reed,MD;Harms,SL;Poindexter,S;Zhou,AY;Eggen,JR;Morris,MA;Quint,AC;McDaniel,S;Baran,A;Dolez,N;Kawaler,SD;Kurtz,DW;Moskalik,P;Riddle,R;Zola,S;Ostensen,RH;Solheim,JE;Kepler,SO;Costa,AFM;Provencal,JL;Mullally,F;Winget,DW;Vuckovic,M;Crowe,R;Terry,D;Avila,R;Berkey,B;Stewart,S;Bodnarik,J;Bolton,D;Binder,PM;Sekiguchi,K;Sullivan,DJ;Kim,SL;Chen,WP;Chen,CW;Lin,HC;Jian,XJ;Wu,H;Gou,JP;Liu,Z;Leibowitz,E;Lipkin,Y;Akan,C;Cakirli,O;Janulis,R;Pretorius,R;Ogloza,W;Stachowski,G;Paparo,M;Szabo,R;Csubry,Z;Zsuffa,D;Silvotti,R;Marinoni,S;Bruni,I;Vauclair,G;Chevreton,M;Matthews,JM;Cameron,C;Pablo,H
贡献者:	天文研究所
日期:	2011
上传时间:	2012-03-27 18:13:23 (UTC+8)
出版者:	國立中央大學
摘要:	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 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.
關聯:	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
显示于类别:	[天文研究所] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	655	检视/开启

在NCUIR中所有的数据项都受到原著作权保护.

社群 sharing

数据加载中.....