Two New Rapidly Rotating ON Stars Found with LAMOST

doi:10.3847/1538-4357/ab5b01

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	Two New Rapidly Rotating ON Stars Found with LAMOST
	Li,Guang-Wei 2; Howarth,Ian D.1
刊名	The Astrophysical Journal
	2020-01-10
卷号	888 期号:2
关键词	Stellar rotation O stars
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab5b01
英文摘要	Abstract The ON stars are a rare subtype of O stars of uncertain origin. We report two new, rapidly rotating ON stars found in data acquired with the Large Sky Area Multi-Object Fiber Spectroscopic Telescope. LS?I?+61 28 is an ON8.5 Vn dwarf with a projected equatorial rotational velocity of , while HDE?236672 is an ON9 IVn subgiant with . The former is the first rapidly rotating ON dwarf to be found, and the latter is only the third ON subgiant. The luminosity classes of non-supergiant ON stars appear to be influenced by the axial inclination angle i: the rapidly rotating giants are close to equator-on, while ON dwarfs with lower values are viewed more nearly pole-on. Combining parallaxes and proper motions from Gaia Data Release 2 with radial-velocity measurements, we investigate the kinematics of non-supergiant ON stars and infer that the dynamics, rapid rotation, and surface nitrogen characteristics may all be consequences of binary interaction.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-888-2-AB5B01
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/28736]
专题	中国科学院国家天文台
作者单位	1.Department of Physics & Astronomy, University College London, Gower St., London WC1E 6BT, UK 2.Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China; lgw@bao.ac.cn
推荐引用方式 GB/T 7714	Li,Guang-Wei,Howarth,Ian D.. Two New Rapidly Rotating ON Stars Found with LAMOST[J]. The Astrophysical Journal,2020,888(2).
APA	Li,Guang-Wei,&Howarth,Ian D..(2020).Two New Rapidly Rotating ON Stars Found with LAMOST.The Astrophysical Journal,888(2).
MLA	Li,Guang-Wei,et al."Two New Rapidly Rotating ON Stars Found with LAMOST".The Astrophysical Journal 888.2(2020).