HOT SUBDWARF STARS OBSERVED IN LAMOST DR1-ATMOSPHERIC PARAMETERS FROM SINGLE-LINED SPECTRA
文献类型：期刊论文
| 作者 | Luo, Yang-Ping1,2,3 ; Nemeth, Peter4; Liu, Chao1; Deng, Li-Cai1; Han, Zhan-Wen3; Han ZW(韩占文)
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2016-02-20 |
| 卷号 | 818期号:2 |
| 关键词 | catalogs subdwarfs surveys techniques: spectroscopic |
| ISSN号 | 0004-637X |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | 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 |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/article/10.3847/0004-637X/818/2/202/meta |
| 语种 | 英语 |
| WOS记录号 | WOS:000372302800101 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/9357]  |
| 专题 | 云南天文台_中国科学院天体结构与演化重点实验室 |
| 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 |
| 推荐引用方式 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, Zhan-Wen,&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). |
入库方式： OAI收割
来源：云南天文台
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