YNAO OpenIR  > 大样本恒星演化研究组
Hot Subdwarf Atmospheric Parameters, Kinematics, and Origins Based on 1587 Hot Subdwarf Stars Observed in Gaia DR2 and LAMOST DR7
Luo, Yangping1; Németh, Péter2,3; Wang, Kun1; Wang, Xi1; Han ZW(韩占文)4
发表期刊ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2021-10
卷号256期号:2
DOI10.3847/1538-4365/ac11f6
收录类别SCI
摘要

Based on the Gaia DR2 catalog of hot subdwarf star candidates, we identified 1587 hot subdwarf stars with spectra in LAMOST DR7. We present atmospheric parameters for these stars by fitting the LAMOST spectra with Tlusty/Synspec non-LTE synthetic spectra. Combining LAMOST radial velocities and Gaia Early Data Release 3 (EDR3) parallaxes and proper motions, we also present the Galactic space positions, velocity vectors, orbital parameters and the Galactic population memberships of the stars. With our He classification scheme, we identify four groups of He rich hot subdwarf stars in the T (eff) - log g and T (eff) - log(nHe/nH) diagrams. We find two extreme He-rich groups (eHe-1 and eHe-2) for stars with log(nHe/nH) >= 0 and two intermediate He-rich groups (iHe-1 and iHe-2) for stars with -1 <= log(nHe/nH) < 0. We also find that over half of the stars in Group eHe-1 are thick-disk stars, while over half of the stars in Group eHe-2 correspond to thin-disk stars. The disk population fractions of Group iHe-1 are between those of Group eHe-1 and eHe-2. Almost all of the stars in Group iHe-2 belong to the thin disk. These differences indicate that the four groups probably have very different origins. Comparisons between hot subdwarf stars in the halo and in the Galactic globular cluster omega Cen show that only He-deficient stars with -2.2 <= log(nHe/nH) < -1 have similar fractions. Hot subdwarfs with log(nHe/nH) >= 0 in omega Cen have no counterparts in the thick-disk and halo populations, but they appear in the thin disk.

资助项目National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[12173028] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[12003022] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[12090040] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[12090043] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[11521303] ; Sichuan Science and Technology Program[2020YFSY0034] ; Grant Agency of the Czech RepublicGrant Agency of the Czech Republic[GACR 18-20083S] ; National Development and Reform Commission
项目资助者National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[12173028, 12003022, 12090040, 12090043, 11521303] ; Sichuan Science and Technology Program[2020YFSY0034] ; Grant Agency of the Czech RepublicGrant Agency of the Czech Republic[GACR 18-20083S] ; National Development and Reform Commission
语种英语
学科领域天文学 ; 恒星与银河系 ; 恒星形成与演化
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0067-0049
URL查看原文
WOS记录号WOS:000698466300001
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]IA PROGENITOR SURVEY ; BLUE HOOK STARS ; WHITE-DWARFS ; B-STARS ; RICH SUBDWARFS ; 3D KINEMATICS ; DATA RELEASE ; DISCOVERY ; PULSATORS ; BINARIES
引用统计
被引频次:15[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
版本出版稿
条目标识符http://ir.ynao.ac.cn/handle/114a53/24575
专题大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
通讯作者Luo, Yangping
作者单位1.Department of Astronomy, China West Normal University, Nanchong, 637002, People's Republic of China; ypluo@bao.ac.cn;
2.Astronomical Institute of the Czech Academy of Sciences, Fričova 298, CZ-251 65 Ondřejov, Czech Republic;
3.Astroserver.org, Fő tér 1, 8533 Malomsok, Hungary;
4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, People's Republic of China
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Luo, Yangping,Németh, Péter,Wang, Kun,et al. Hot Subdwarf Atmospheric Parameters, Kinematics, and Origins Based on 1587 Hot Subdwarf Stars Observed in Gaia DR2 and LAMOST DR7[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2021,256(2).
APA Luo, Yangping,Németh, Péter,Wang, Kun,Wang, Xi,&Han ZW.(2021).Hot Subdwarf Atmospheric Parameters, Kinematics, and Origins Based on 1587 Hot Subdwarf Stars Observed in Gaia DR2 and LAMOST DR7.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,256(2).
MLA Luo, Yangping,et al."Hot Subdwarf Atmospheric Parameters, Kinematics, and Origins Based on 1587 Hot Subdwarf Stars Observed in Gaia DR2 and LAMOST DR7".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 256.2(2021).
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