The temporal spectrum of the sdB pulsating star HS 2201+2610 at 2 ms resolution

	The temporal spectrum of the sdB pulsating star HS 2201+2610 at 2 ms resolution
	Silvotti, R ; Janulis, R ; Schuh, SL ; Charpinet, S ; Oswalt, T ; Silvestri, N ; Perez, JMG ; Kalytis, R ; Meistas, E ; Alisauskas, D
刊名	ASTRONOMY & ASTROPHYSICS
	2002-07-01
卷号	389 期号:1 页码:180-190
关键词	stars : subdwarfs stars : oscillations stars : individual : HS 2201+2610
英文摘要	In this article we present the results of more than 180 hours of time-series photometry on the low gravity (log g = 5:4, T-eff = 29 300 K, log He=H = -3.0 by number) sdB pulsating star HS 2201+2610, obtained between September 2000 and August 2001. The temporal spectrum is resolved and shows 5 close frequencies: three main signals at 2860.94, 2824.10 and 2880.69 muHz, with amplitudes of about 1%, 0.5% and 0.1% respectively, are detected from single run observations; two further peaks with very low amplitude (<0.07%) at 2738.01 and 2921.82 μHz are confirmed by phase analysis on several independent runs. Due to the small number of detected frequencies, it is not possible to obtain a univocal identification of the excited modes and perform a detailed seismological analysis of the star. No clear signatures of rotational splitting are seen. Nevertheless, the observed period spectrum is well inside the excited period window obtained from pulsation calculations with nonadiabatic models having effective temperature and surface gravity close to the spectroscopic estimates. Due to its relatively simple temporal spectrum, HS 2201+2610 is a very good candidate for trying to measure the secular variation of the pulsation periods in time. With this purpose a long-term monitoring of the star was started. The results of the first 11 months show amplitude variations up to &SIM;20% on time-scales of months, which are probably real, and allow us to measure the pulsation frequencies with an unprecedented 0.02 μHz resolution.
收录类别	SCI
语种	英语
WOS记录号	WOS:000176561500025
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8495]
专题	国家天文台_光学天文研究部
作者单位	1.Osserv Astron Capodimonte, I-80131 Naples, Italy 2.Inst Theoret Phys & Astron, LT-2600 Vilnius, Lithuania 3.Vilnius State Univ, Astron Observ, LT-2009 Vilnius, Lithuania 4.Inst Astron & Astrophys, D-72076 Tubingen, Germany 5.Observ Midi Pyrenees, F-31400 Toulouse, France 6.Florida Inst Technol, Dept Phys & Space Sci, Melbourne, FL 32901 USA 7.Florida Inst Technol, SARA Observ, Melbourne, FL 32901 USA 8.Univ Tromso, Inst Fys, N-9037 Tromso, Norway 9.Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy 10.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Silvotti, R,Janulis, R,Schuh, SL,et al. The temporal spectrum of the sdB pulsating star HS 2201+2610 at 2 ms resolution[J]. ASTRONOMY & ASTROPHYSICS,2002,389(1):180-190.
APA	Silvotti, R.,Janulis, R.,Schuh, SL.,Charpinet, S.,Oswalt, T.,...&Carlson, G.(2002).The temporal spectrum of the sdB pulsating star HS 2201+2610 at 2 ms resolution.ASTRONOMY & ASTROPHYSICS,389(1),180-190.
MLA	Silvotti, R,et al."The temporal spectrum of the sdB pulsating star HS 2201+2610 at 2 ms resolution".ASTRONOMY & ASTROPHYSICS 389.1(2002):180-190.