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HCT/HESP study of two carbon stars from the LAMOST survey
Shejeelammal, J.1; Goswami, Aruna1; Shi, Jianrong2
2021-03-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume502Issue:1Pages:1008-1025
AbstractCarbon stars, enhanced in carbon and neutron-capture elements, provide a wealth of information about the nucleosynthesis history of the Galaxy. In this work, we present the first ever detailed abundance analysis of the carbon star LAMOSTJ091608.81+230734.6 and a detailed abundance analysis of neutron-capture elements for the object LAMOSTJ151003.74+305407.3. Updates on the abundances of elements C, O, Mg, Ca, Cr, Mn and Ni for LAMOSTJ151003.74+305407.3 are also presented. Our analysis is based on high-resolution spectra obtained using the Hanle Echelle Spectrograph (HESP) attached to the Himalayan Chandra Telescope (HCT) at the Indian Astronomical Observatory, Hanle. The stellar atmospheric parameters (T-eff, log g, microturbulance zeta, metallicity [Fe/H]) are found to be (4820, 1.43, 1.62, -0.89) and (4500, 1.55, 1.24, -1.57) for these two objects, respectively. The abundance estimates of several elements, namely C, N, O, Na, alpha-elements, Fe-peak elements and neutron-capture elements Rb, Sr, Y, Zr, Ba, La, Ce, Pr, Nd, Sm and Eu, are presented. Our analysis shows the star LAMOSTJ151003.74+305407.3 to be a CEMP-r/s star, and LAMOSTJ091608.81+230734.6 to be a CH giant. We have examined if the i-process model yields ([X/Fe]) of heavy elements could explain the observed abundances of the CEMP-r/s star based on a parametric model-based analysis. The negative values obtained for the neutron-density-dependent [Rb/Zr] ratio confirm former low-mass asymptotic giant branch companions for both stars. Kinematic analysis shows that LAMOSTJ151003.74+305407.3 belongs to the Galactic halo population while LAMOSTJ091608.81+230734.6 belongs to the disc population.
Keywordstars: abundances stars: carbon stars: individual: LAMOSTJ091608.81+230734.6 stars: individual: LAMOSTJ151003.74+305407.3
Funding OrganizationDST SERB ; DST SERB ; DST SERB ; DST SERB ; DST SERB ; DST SERB ; DST SERB ; DST SERB
DOI10.1093/mnras/staa3892
WOS KeywordMETAL-POOR STARS ; HIGH-DISPERSION-SPECTROGRAPH ; GIANT BRANCH STARS ; S-PROCESS ; OSCILLATOR-STRENGTHS ; R-PROCESS ; ELEMENTAL ABUNDANCES ; PROCESS NUCLEOSYNTHESIS ; CHEMICAL-COMPOSITION ; HORIZONTAL-BRANCH
Language英语
Funding ProjectDST SERB[EMR/2016/005283]
Funding OrganizationDST SERB ; DST SERB ; DST SERB ; DST SERB ; DST SERB ; DST SERB ; DST SERB ; DST SERB
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000649423200067
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/77104
Collection中国科学院国家天文台
Corresponding AuthorShejeelammal, J.; Goswami, Aruna
Affiliation1.Indian Inst Astrophys, Bangalore 560034, Karnataka, India
2.Natl Astron Observ, CAS Key Lab Opt Astron, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Shejeelammal, J.,Goswami, Aruna,Shi, Jianrong. HCT/HESP study of two carbon stars from the LAMOST survey[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2021,502(1):1008-1025.
APA Shejeelammal, J.,Goswami, Aruna,&Shi, Jianrong.(2021).HCT/HESP study of two carbon stars from the LAMOST survey.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,502(1),1008-1025.
MLA Shejeelammal, J.,et al."HCT/HESP study of two carbon stars from the LAMOST survey".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 502.1(2021):1008-1025.
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