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; Luo, YP
发表期刊ASTROPHYSICAL JOURNAL
2016-02-20
卷号818期号:2
DOI10.3847/0004-637X/818/2/202
收录类别SCI
关键词Catalogs Subdwarfs Surveys Techniques: Spectroscopic
摘要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.
项目资助者Deutsche 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
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000372302800101
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]BLANKETED MODEL ATMOSPHERES ; IA PROGENITOR SURVEY ; BLUE HOOK STARS ; B-STARS ; PILOT SURVEY ; HORIZONTAL-BRANCH ; GLOBULAR-CLUSTERS ; SDB STARS ; ULTRAVIOLET-RADIATION ; SUBLUMINOUS STARS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9357
专题中国科学院天体结构与演化重点实验室
通讯作者Luo, YP
作者单位1.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
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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,&Luo, YP.(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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