Asteroseismology of the new multiperiodic gamma Dor variable HD239276

	Asteroseismology of the new multiperiodic gamma Dor variable HD239276
	Rodriguez, E.; Costa, V.; Zhou, A. -Y.; Grigahcene, A.; Dupret, M. A.; Suarez, J. C.; Moya, A.; Lopez-Gonzalez, M. J.; Wei, J. -Y.; Fan, Y.
刊名	ASTRONOMY & ASTROPHYSICS
	2006-09-01
卷号	456 期号:1 页码:261-268
关键词	stars : variables : general stars : individual : HD239276 stars : oscillations techniques : photometric
英文摘要	The variability of HD239276 was suspected photometrically nearly twenty years ago, but was confirmed with new observations obtained in 2001 during a two-site photometric campaign carried out from Spain, in uvby beta Stromgren-Crawford photometry, and China, using the Johnson V filter. Two low-dispersion spectra were also collected. The results establish this star as a new multiperiodic gamma Dortype pulsator with deficiency in metallicity. Its possible lambda Boo nature is discussed. The frequency analysis shows three pulsational frequencies as significant, but some more are probably present among the residuals. The method based on phase shifts and amplitude ratios in multicolour photometry is used to identify the excited modes with non-adiabatic time-dependent convection models. A very good agreement between the theoretical and observed amplitude ratios is obtained and the two main modes are identified as l = 1 modes. Nevertheless, our results do not allow us to discriminate between a solar abundance and a metal deficient nature for this star. The frequency ratio method is further used for the identification of the modes. The results suggest low metallicity for this star, but a lambda Boo nature may be not ruled out.
收录类别	SCI
语种	英语
WOS记录号	WOS:000240009800026
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/7110]
专题	国家天文台_空间科学研究部
作者单位	1.CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Algiers Observ, CRAAG, Algiers 16340, Algeria 4.Observ Paris, LESIA, UMR 8109, F-92190 Meudon, France
推荐引用方式 GB/T 7714	Rodriguez, E.,Costa, V.,Zhou, A. -Y.,et al. Asteroseismology of the new multiperiodic gamma Dor variable HD239276[J]. ASTRONOMY & ASTROPHYSICS,2006,456(1):261-268.
APA	Rodriguez, E..,Costa, V..,Zhou, A. -Y..,Grigahcene, A..,Dupret, M. A..,...&Fan, Y..(2006).Asteroseismology of the new multiperiodic gamma Dor variable HD239276.ASTRONOMY & ASTROPHYSICS,456(1),261-268.
MLA	Rodriguez, E.,et al."Asteroseismology of the new multiperiodic gamma Dor variable HD239276".ASTRONOMY & ASTROPHYSICS 456.1(2006):261-268.