Stellar Parameters and Orbital Period Estimates for Composite-spectrum Subdwarf plus Main-sequence Binaries from LAMOST
文献类型：期刊论文
| 作者 | Li JD(李江丹)3; Xiong JP(熊建萍)3; Li J(李蛟)3; Chen HL(陈海亮)2,3; Ge HW(葛宏伟)2,3; Yang, Mingkuan1,2; Chen XF(陈雪飞)2,3; Han ZW(韩占文)2,3 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2026-04-10 |
| 卷号 | 1001期号:1 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ae5221 |
| 产权排序 | 第1完成单位 |
| 文献子类 | Article |
| 英文摘要 | Hot subdwarf (sdB) stars in binary systems with main-sequence (MS) companions provide valuable insights into mass transfer and envelope ejection processes in binary evolution. Their mass ratios, orbital periods, and stellar properties encode key information about their evolutionary histories. In this work, we analyze a sample of 123 composite-spectrum sdB+MS binaries identified from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope Low-Resolution Survey (LAMOST-LRS) Data Release (DR) 8. We adopt atmospheric parameters from spectral decomposition and estimate stellar masses and radii using theoretical evolutionary tracks. Radial velocities for both the sdBs and cool companions are measured independently through cross correlation with synthetic templates. Orbital periods are statistically estimated using single-epoch radial velocity separations and a Monte Carlo method that accounts for random inclination and orbital phase. We find that sdB masses are narrowly distributed around 0.5 M circle dot, consistent with expectations for core-helium-burning stars, while MS companion masses span 0.6-1.9 M circle dot, with most falling between 1.0 and 1.4 M circle dot. The inferred orbital-period distribution shows a clear concentration toward long periods, broadly consistent with expectations for binaries formed through stable Roche-lobe overflow. Given that our sample consists of composite-spectrum sdB binaries, mainly sdB+FGK systems, the prevalence of long periods is largely driven by observational selection effects rather than the intrinsic period distribution of the sdB binary population. This study provides one of the largest uniform catalogs of composite spectrum sdB binaries to date, offering new observational constraints on their physical properties and formation channels. |
| 学科主题 | 天文学 ; 恒星与银河系 |
| URL标识 | 查看原文 |
| 出版地 | No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND |
| WOS关键词 | B-STARS ; HOT ; ORIGIN ; MODEL ; TRACKS ; I. |
| 资助项目 | MOST divided by National Natural Science Foundation of China (NSFC)[12125303]; MOST divided by National Natural Science Foundation of China (NSFC)[12288102]; MOST divided by National Natural Science Foundation of China (NSFC)[12090040]; MOST divided by National Natural Science Foundation of China (NSFC)[12403040] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001731537800001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | MOST divided by National Natural Science Foundation of China (NSFC)[12125303, 12288102, 12090040, 12403040] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/29105]  |
| 专题 | 云南天文台_大样本恒星演化研究组 |
| 通讯作者 | Li JD(李江丹) |
| 作者单位 | 1.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China 2.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China; 3.International Centre of Supernovae (ICESUN), Yunnan Key Laboratory of Supernova Research, Yunnan Observatories, Chinese Academy of Sciences (CAS), Kunming 650216, People’s Republic of China; lijiangdan@ynao.ac.cn; |
| 推荐引用方式 GB/T 7714 | Li JD,Xiong JP,Li J,et al. Stellar Parameters and Orbital Period Estimates for Composite-spectrum Subdwarf plus Main-sequence Binaries from LAMOST[J]. ASTROPHYSICAL JOURNAL,2026,1001(1). |
| APA | 李江丹.,熊建萍.,李蛟.,陈海亮.,葛宏伟.,...&韩占文.(2026).Stellar Parameters and Orbital Period Estimates for Composite-spectrum Subdwarf plus Main-sequence Binaries from LAMOST.ASTROPHYSICAL JOURNAL,1001(1). |
| MLA | 李江丹,et al."Stellar Parameters and Orbital Period Estimates for Composite-spectrum Subdwarf plus Main-sequence Binaries from LAMOST".ASTROPHYSICAL JOURNAL 1001.1(2026). |
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来源：云南天文台
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