LAMOST J221750.59+210437.2: A new member of carbon-enhanced extremely metal-poor stars with excesses of Mg and Si

doi:10.1093/pasj/psy092

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	LAMOST J221750.59+210437.2: A new member of carbon-enhanced extremely metal-poor stars with excesses of Mg and Si
	Aoki, Wako 1,2; Matsuno, Tadafumi 1; Honda, Satoshi 5; Ishigaki, Miho N.6; Li, Haining 3; Suda, Takuma 4; Kumar, Yerra Bharat 3
刊名	PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
	2018-10-01
卷号	70 期号:5 页码:10
关键词	nuclear reactions, nucleosynthesis, abundances stars: abundances stars: individual (LAMOST J221750.59+210437.2) stars: Population II
ISSN号	0004-6264
DOI	10.1093/pasj/psy092
英文摘要	We report on the elemental abundances of the carbon-enhanced metal-poor (CEMP) star J2217+2104, discovered through our metal-poor star survey with LAMOST and Subaru. This object is a red giant and has extremely low Fe abundance ([Fe/H] = -4.0) and very large enhancement of C, N, and O with excesses of Na, Mg, Al, and Si. This star is a new example of a small group of such CEMP stars identified by previous studies. We find a very similar abundance pattern for O-Zn in this class of objects that shows enhancement of elements up to Si and normal abundance of Ca and Fe-group elements. Whereas the C/N ratio is different among these stars, the (C + N)/O ratio is similar. This suggests that similar abundance ratios of C were also yielded, relative to O-Zn in progenitors, and was later affected by the CN-cycle. By contrast, the heavy neutron-capture elements Sr and Ba are deficient in J2217+2104, compared to the four objects in this class previously studied. This indicates that the neutron-capture process in the early Galaxy, presumably the r-process, has no direct connection to the phenomenon that has formed such CEMP stars. Comparisons of the abundance pattern that are well determined for such CEMP stars with those of supernova nucleosynthesis models constrain the progenitor mass to be about 25 M-circle dot, which is not particularly different from the typical mass of progenitors expected for extremely metal-poor stars in general.
资助项目	National Development and Reform Commission ; JSPS - CAS Joint Research Program ; JSPS KAKENHI[16H02168] ; JSPS KAKENHI[16K05287] ; JSPS KAKENHI[15HP7004] ; JSPS KAKENHI[17K14249] ; NSFC[11573032] ; NSFC[11390371]
WOS关键词	HIGH DISPERSION SPECTROGRAPH ; SPECTROSCOPIC ANALYSIS ; CHEMICAL-COMPOSITION ; 1ST STARS ; ABUNDANCES ; OXYGEN ; CS-22949-037 ; EVOLUTION ; RICH
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000456070400015
资助机构	National Development and Reform Commission ; National Development and Reform Commission ; JSPS - CAS Joint Research Program ; JSPS - CAS Joint Research Program ; JSPS KAKENHI ; JSPS KAKENHI ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; JSPS - CAS Joint Research Program ; JSPS - CAS Joint Research Program ; JSPS KAKENHI ; JSPS KAKENHI ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; JSPS - CAS Joint Research Program ; JSPS - CAS Joint Research Program ; JSPS KAKENHI ; JSPS KAKENHI ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; JSPS - CAS Joint Research Program ; JSPS - CAS Joint Research Program ; JSPS KAKENHI ; JSPS KAKENHI ; NSFC ; NSFC
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/24727]
专题	中国科学院国家天文台
通讯作者	Aoki, Wako
作者单位	1.Grad Univ Adv Studies SOKENDAI, Sch Phys Sci, Dept Astron Sci, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan 2.Natl Astron Observ, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan 3.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, A20 Datun Rd, Beijing 100012, Peoples R China 4.Univ Tokyo, Grad Sch Sci, Res Ctr Early Universe, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan 5.Univ Hyogo, Ctr Astron, 407-2 Nishigaichi, Sayo, Hyogo 6795313, Japan 6.Univ Tokyo, Kavli Inst Phys & Math Universe WPI, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778583, Japan
推荐引用方式 GB/T 7714	Aoki, Wako,Matsuno, Tadafumi,Honda, Satoshi,et al. LAMOST J221750.59+210437.2: A new member of carbon-enhanced extremely metal-poor stars with excesses of Mg and Si[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2018,70(5):10.
APA	Aoki, Wako.,Matsuno, Tadafumi.,Honda, Satoshi.,Ishigaki, Miho N..,Li, Haining.,...&Kumar, Yerra Bharat.(2018).LAMOST J221750.59+210437.2: A new member of carbon-enhanced extremely metal-poor stars with excesses of Mg and Si.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,70(5),10.
MLA	Aoki, Wako,et al."LAMOST J221750.59+210437.2: A new member of carbon-enhanced extremely metal-poor stars with excesses of Mg and Si".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 70.5(2018):10.