High-resolution spectroscopy and spectropolarimetry of selected delta Sct pulsating variables

	High-resolution spectroscopy and spectropolarimetry of selected delta Sct pulsating variables
	Joshi, Santosh 1; Semenko, Eugene 2; Moiseeva, A.2; Sharma, Kaushal 3; Joshi, Y. C.1; Sachkov, M.4,5; Singh, Harinder P.3; Yerra, Bharat Kumar 6
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2017-05-01
卷号	467 期号:1 页码:633-645
关键词	stars: abundances stars: chemically peculiar stars: fundamental parameters
英文摘要	The combination of photometry, spectroscopy and spectropolarimetry of the chemically peculiar stars often aims to study the complex physical phenomena such as stellar pulsation, chemical inhomogeneity, magnetic field and their interplay with stellar atmosphere and circumstellar environment. The prime objective of this study is to determine the atmospheric parameters of a set of Am stars to understand their evolutionary status. Atmospheric abundances and basic parameters are determined using full spectrum fitting technique by comparing the high-resolution spectra to the synthetic spectra. To know the evolutionary status, we derive the effective temperature and luminosity from different methods and compare them with the literature. The location of these stars in the Hertzsprung-Russell diagram demonstrates that all the sample stars are evolved from the zero-age main sequence towards terminal-age main sequence and occupy the region of delta Sct instability strip. The abundance analysis shows that the light elements e.g. Ca and Sc are underabundant while iron peak elements such as Ba, Ce, etc. are overabundant and these chemical properties are typical for Am stars. The results obtained from the spectropolarimetric analysis of our studied stars show that the longitudinal magnetic field is negligible in all of them, which further support to their Am class of peculiarity.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	A-TYPE STARS ; CHEMICALLY PECULIAR STARS ; UPPER MAIN-SEQUENCE ; MAGNETIC-FIELDS ; EFFECTIVE TEMPERATURE ; FUNDAMENTAL PARAMETERS ; BOLOMETRIC CORRECTIONS ; SOLAR NEIGHBORHOOD ; BETA PHOTOMETRY ; SURFACE GRAVITY
收录类别	SCI
语种	英语
WOS记录号	WOS:000398418900041
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8218]
专题	国家天文台_光学天文研究部
作者单位	1.Aryabhatta Res Inst Observat Sci, Manora Peak 263002, Nainital, India 2.Russian Acad Sci, Special Astrophys Observ, Nizhnii Arkhyz 369167, Karachai Cherke, Russia 3.Univ Delhi, Dept Phys & Astrophys, Delhi 110007, India 4.Russian Acad Sci, Inst Astron, Moscow 119017, Russia 5.RUDN Univ, Inst Appl Tech & Econ Res & Expert Assessment, Moscow 117198, Russia 6.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Joshi, Santosh,Semenko, Eugene,Moiseeva, A.,et al. High-resolution spectroscopy and spectropolarimetry of selected delta Sct pulsating variables[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,467(1):633-645.
APA	Joshi, Santosh.,Semenko, Eugene.,Moiseeva, A..,Sharma, Kaushal.,Joshi, Y. C..,...&Yerra, Bharat Kumar.(2017).High-resolution spectroscopy and spectropolarimetry of selected delta Sct pulsating variables.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,467(1),633-645.
MLA	Joshi, Santosh,et al."High-resolution spectroscopy and spectropolarimetry of selected delta Sct pulsating variables".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 467.1(2017):633-645.