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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

文献类型：期刊论文

作者Aoki, Wako1,2; Matsuno, Tadafumi1; Honda, Satoshi5; Ishigaki, Miho N.6; Li, Haining3; Suda, Takuma4; Kumar, Yerra Bharat3
刊名PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
出版日期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
DOI10.1093/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.
WOS关键词HIGH DISPERSION SPECTROGRAPH ; SPECTROSCOPIC ANALYSIS ; CHEMICAL-COMPOSITION ; 1ST STARS ; ABUNDANCES ; OXYGEN ; CS-22949-037 ; EVOLUTION ; RICH
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研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000456070400015
出版者OXFORD UNIV PRESS
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
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.

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