NAOC Open IR
A LAMOST BHB Catalog and Kinematics Therein. I. Catalog and Halo Properties
Vickers, John J.1,2; Li, Zhao-Yu1,2; Smith, Martin C.3; Shen, Juntai1,2,3
2021-05-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume912Issue:1Pages:12
AbstractIn this paper, we collect a sample of stars observed both in LAMOST and Gaia, which have colors implying a temperature hotter than 7000 K. We train a machine-learning algorithm on LAMOST spectroscopic data which has been tagged with stellar classifications and metallicities, and use this machine to construct a catalog of blue horizontal branch stars (BHBs), together with metallicity information. Another machine is trained using Gaia parallaxes to predict absolute magnitudes for these stars. The final catalog of 13,693 BHBs is thought to be about 86% pure, with sigma ([Fe/H]) similar to 0.35 dex, and sigma ( G ) similar to 0.31 mag. These values are confirmed via comparison to globular clusters, although a covariance error seems to affect our magnitude and abundance estimates. We analyze a subset of this catalog in the Galactic Halo. We find that BHB populations in the outer halo appear redder, which could imply a younger population, and that the metallicity gradient is relatively flat around [Fe/H] = -1.9 dex over our sample footprint. We find that our metal-rich BHB stars are on more radial velocity dispersion-dominated orbits (beta similar to 0.70) at all radii than our metal-poor BHB stars (beta similar to 0.62).
Funding OrganizationNational Key RD Program of China ; National Key RD Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education ; "111" Project of the Ministry of Education ; Chinese Academy of Sciences President's International Fellowship Initiative ; Chinese Academy of Sciences President's International Fellowship Initiative ; CAS One Hundred Talent Fund ; CAS One Hundred Talent Fund ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Key RD Program of China ; National Key RD Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education ; "111" Project of the Ministry of Education ; Chinese Academy of Sciences President's International Fellowship Initiative ; Chinese Academy of Sciences President's International Fellowship Initiative ; CAS One Hundred Talent Fund ; CAS One Hundred Talent Fund ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Key RD Program of China ; National Key RD Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education ; "111" Project of the Ministry of Education ; Chinese Academy of Sciences President's International Fellowship Initiative ; Chinese Academy of Sciences President's International Fellowship Initiative ; CAS One Hundred Talent Fund ; CAS One Hundred Talent Fund ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Key RD Program of China ; National Key RD Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education ; "111" Project of the Ministry of Education ; Chinese Academy of Sciences President's International Fellowship Initiative ; Chinese Academy of Sciences President's International Fellowship Initiative ; CAS One Hundred Talent Fund ; CAS One Hundred Talent Fund ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission
DOI10.3847/1538-4357/abe4d0
Language英语
Funding ProjectNational Key RD Program of China[2018YFA0404501] ; National Natural Science Foundation of China[12025302] ; National Natural Science Foundation of China[11773052] ; National Natural Science Foundation of China[11761131016] ; "111" Project of the Ministry of Education[B20019] ; Chinese Academy of Sciences President's International Fellowship Initiative ; CAS One Hundred Talent Fund ; NSFC[11673083] ; NSFC[11333003] ; National Development and Reform Commission
Funding OrganizationNational Key RD Program of China ; National Key RD Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education ; "111" Project of the Ministry of Education ; Chinese Academy of Sciences President's International Fellowship Initiative ; Chinese Academy of Sciences President's International Fellowship Initiative ; CAS One Hundred Talent Fund ; CAS One Hundred Talent Fund ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Key RD Program of China ; National Key RD Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education ; "111" Project of the Ministry of Education ; Chinese Academy of Sciences President's International Fellowship Initiative ; Chinese Academy of Sciences President's International Fellowship Initiative ; CAS One Hundred Talent Fund ; CAS One Hundred Talent Fund ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Key RD Program of China ; National Key RD Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education ; "111" Project of the Ministry of Education ; Chinese Academy of Sciences President's International Fellowship Initiative ; Chinese Academy of Sciences President's International Fellowship Initiative ; CAS One Hundred Talent Fund ; CAS One Hundred Talent Fund ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Key RD Program of China ; National Key RD Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; "111" Project of the Ministry of Education ; "111" Project of the Ministry of Education ; Chinese Academy of Sciences President's International Fellowship Initiative ; Chinese Academy of Sciences President's International Fellowship Initiative ; CAS One Hundred Talent Fund ; CAS One Hundred Talent Fund ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000646380600001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/78226
Collection中国科学院国家天文台
Corresponding AuthorVickers, John J.
Affiliation1.Shanghai Jiao Tong Univ, Sch Phys & Astron, Dept Astron, 800 Dongchuan Rd, Shanghai 200240, Peoples R China
2.Shanghai Key Lab Particle Phys & Cosmol, Key Lab Particle Astrophys & Cosmol MOE, Shanghai 200240, Peoples R China
3.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China
Recommended Citation
GB/T 7714
Vickers, John J.,Li, Zhao-Yu,Smith, Martin C.,et al. A LAMOST BHB Catalog and Kinematics Therein. I. Catalog and Halo Properties[J]. ASTROPHYSICAL JOURNAL,2021,912(1):12.
APA Vickers, John J.,Li, Zhao-Yu,Smith, Martin C.,&Shen, Juntai.(2021).A LAMOST BHB Catalog and Kinematics Therein. I. Catalog and Halo Properties.ASTROPHYSICAL JOURNAL,912(1),12.
MLA Vickers, John J.,et al."A LAMOST BHB Catalog and Kinematics Therein. I. Catalog and Halo Properties".ASTROPHYSICAL JOURNAL 912.1(2021):12.
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