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http://ir.lib.ncu.edu.tw/handle/987654321/50926
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| Title: | The pulsations of PG 1351+489 |
| Authors: | Redaelli,M;Kepler,SO;Costa,JES;Winget,DE;Handler,G;Castanheira,BG;Kanaan,A;Fraga,L;Henrique,P;Giovannini,O;Provencal,JL;Shipman,HL;Dalessio,J;Thompson,SE;Mullally,F;Brewer,MM;Childers,D;Oksala,ME;Rosen,R;Wood,MA;Reed,MD;Walter,B;Strickland,W;Chandler,D;Watson,TK;Nather,RE;Montgomery,MH;Bischoff-Kim,A;Hansen,CJ;Nitta,A;Kleinman,SJ;Claver,CF;Brown,TM;Sullivan,DJ;Kim,SL;Chen,WP;Yang,M;Shih,CY;Zhang,X;Jiang,X;Fu,JN;Seetha,S;Ashoka,BN;Marar,TMK;Baliyan,KS;Vats,HO;Chernyshev,AV;Ibbetson,P;Leibowitz,E;Hemar,S;Sergeev,AV;Andreev,MV;Janulis,R;Meistas,EG;Moskalik,P;Pajdosz,G;Baran,A;Winiarski,M;Zola,S;Ogloza,W;Siwak,M;Bognar,Z;Solheim,JE;Sefako,R;Buckley,D;Donoghue,D;Nagel,T;Silvotti,R;Bruni,I;Fremy,JR;Vauclair,G;Chevreton,M;Dolez,N;Pfeiffer,B;Barstow,MA;Creevey,OL;Kawaler,SD;Clemens,JC |
| Contributors: | 天文研究所 |
| Keywords: | WHITE-DWARF STARS;WHOLE EARTH TELESCOPE;TIME-SERIES ANALYSIS;PERIOD CHANGE;EVOLUTION;PG-1351+489;GD-358;GD358 |
| Date: | 2011 |
| Issue Date: | 2012-03-27 18:13:03 (UTC+8) |
| Publisher: | 國立中央大學 |
| Abstract: | PG 1351+489 is one of the 20 DBVs - pulsating helium-atmosphere white dwarf stars - known and has the simplest power spectrum for this class of star, making it a good candidate to study cooling rates. We report accurate period determinations for the main peak at 489.334 48 s and two other normal modes using data from the Whole Earth Telescope (WET) observations of 1995 and 2009. In 2009, we detected a new pulsation mode and the main pulsation mode exhibited substantial change in its amplitude compared to all previous observations. We were able to estimate the star's rotation period, of 8.9 h, and discuss a possible determination of the rate of period change of (2.0 +/- 0.9) x 10(-13) s s(-1), the first such estimate for a DBV. |
| Relation: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
| Appears in Collections: | [天文研究所] 期刊論文
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