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HOT SUBDWARF STARS OBSERVED IN LAMOST DR1-ATMOSPHERIC PARAMETERS FROM SINGLE-LINED SPECTRA
Luo, Yang-Ping1,2,3; Nemeth, Peter4; Liu, Chao1; Deng, Li-Cai1; Han ZW(韩占文)3
Source PublicationASTROPHYSICAL JOURNAL
2016-02-20
Volume818Issue:2
DOI10.3847/0004-637X/818/2/202
Indexed BySCI
KeywordCatalogs Subdwarfs Surveys Techniques: Spectroscopic
Abstract

We present a catalog of 166 spectroscopically identified hot subdwarf stars from LAMOST DR1, 44 of which show the characteristics of cool companions in their optical spectra. Atmospheric parameters of 122 subdwarf stars with non-composite spectra were measured by fitting the profiles of hydrogen (H) and helium (He) lines with synthetic spectra from non-LTE model atmospheres. Most of the sdB stars scatter near the Extreme Horizontal Branch in the T-eff-log g diagram and two well defined groups can be outlined. A clustering of He-enriched sdO stars appears near T-eff = 45,000 K and log g = 5.8. The sdB population separates into several nearly parallel sequences in the T-eff-He abundance diagram with clumps corresponding to those in the T-eff-log g diagram. Over 38,000 K (sdO) stars show abundance extremes; they are either He-rich or He-deficient and we observe only a few stars in the abundance range -1< log y < 0. With increasing temperature these extremes become less prominent and the He abundance approaches log y similar to-0.5. A unique property of our sample is that it covers a large range in apparent magnitude and galactic latitude, therefore it contains a mix of stars from different populations and galactic environments. Our results are consistent with the findings of Hirsch and we conclude that He-rich and He-deficient sdB stars (log y <. 1) probably originate from different populations. We also find that most sdO and sdB stars lie in a narrow strip in the plane of luminosity and helium abundance, which suggests that these atmospheric parameters are correlated.

Funding ProjectDeutsche Forschungsgemeinschaft[He 1356/49-2] ; Strategic Priority Research Program The Emergence of Cosmological Structures of the Chinese Academy of Sciences[XDB09000000] ; National Key Basic Research Program of China[2014CB845700] ; National Natural Science Foundation of China (NSFC)[11303021] ; National Natural Science Foundation of China (NSFC)[11390374] ; National Natural Science Foundation of China (NSFC)[11373032] ; National Natural Science Foundation of China (NSFC)[11333003] ; National Natural Science Foundation of China (NSFC)[11473037] ; National Natural Science Foundation of China (NSFC)[11521303 U1231202] ; National Natural Science Foundation of China (NSFC)[U1231119] ; Foundation of China West Normal University[12B206, CXTD2014-1] ; National Development and Reform Commission
Funding OrganizationDeutsche Forschungsgemeinschaft[He 1356/49-2] ; Strategic Priority Research Program The Emergence of Cosmological Structures of the Chinese Academy of Sciences[XDB09000000] ; National Key Basic Research Program of China[2014CB845700] ; National Natural Science Foundation of China (NSFC)[11303021, 11390374, 11373032, 11333003, 11473037, 11521303 U1231202, U1231119] ; Foundation of China West Normal University[12B206, CXTD2014-1] ; National Development and Reform Commission
Language英语
Subject Area天文学 ; 天体物理学 ; 实测天体物理学 ; 恒星与银河系 ; 恒星天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000372302800101
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordBLANKETED MODEL ATMOSPHERES ; IA PROGENITOR SURVEY ; BLUE HOOK STARS ; B-STARS ; PILOT SURVEY ; HORIZONTAL-BRANCH ; GLOBULAR-CLUSTERS ; SDB STARS ; ULTRAVIOLET-RADIATION ; SUBLUMINOUS STARS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9357
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorLuo, Yang-Ping
Affiliation1.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
2.School of Physics and Space Science, China West Normal University, Nanchong, 637009, China
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
4.Dr. Remeis-Sternwarte Astronomisches Institut, Universität Erlangen-Nürnberg, D-96049, Bamberg, Germany
Recommended Citation
GB/T 7714
Luo, Yang-Ping,Nemeth, Peter,Liu, Chao,et al. HOT SUBDWARF STARS OBSERVED IN LAMOST DR1-ATMOSPHERIC PARAMETERS FROM SINGLE-LINED SPECTRA[J]. ASTROPHYSICAL JOURNAL,2016,818(2).
APA Luo, Yang-Ping,Nemeth, Peter,Liu, Chao,Deng, Li-Cai,&Han ZW.(2016).HOT SUBDWARF STARS OBSERVED IN LAMOST DR1-ATMOSPHERIC PARAMETERS FROM SINGLE-LINED SPECTRA.ASTROPHYSICAL JOURNAL,818(2).
MLA Luo, Yang-Ping,et al."HOT SUBDWARF STARS OBSERVED IN LAMOST DR1-ATMOSPHERIC PARAMETERS FROM SINGLE-LINED SPECTRA".ASTROPHYSICAL JOURNAL 818.2(2016).
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