A Long-period Pre-ELM System Discovered from the LAMOST Medium-resolution Survey | |
Zhang, Zhi-Xiang9; Zheng, Ling-Lin9; Gu, Wei-Min9; Sun, Mouyuan9; Yi, Tuan9; Shi, Jian-Rong7,8; Wang, Song8; Bai, Zhong-Rui8; Zhang, Hao-Tong8; Cui, Wen-Yuan6 | |
刊名 | ASTROPHYSICAL JOURNAL |
2022-07-01 | |
卷号 | 933期号:2 |
ISSN号 | 0004-637X |
DOI | 10.3847/1538-4357/ac75b6 |
产权排序 | 第7完成单位 |
文献子类 | Article |
英文摘要 | We present LAMOST J041920.07+072545.4 (hereafter J0419), a close binary consisting of a bloated, extremely low mass pre-white dwarf (pre-ELM WD) and a compact object with an orbital period of 0.607189 days. The large-amplitude ellipsoidal variations and the evident Balmer and He I emission lines suggest a filled Roche lobe and ongoing mass transfer. No outburst events were detected in the 15 years of monitoring of J0419, indicating a very low mass transfer rate. The temperature of the pre-ELM, T-eff = 5793(-133)(+124) K, makes it cooler than the known ELMs, but hotter than most cataclysmic variable donors. Combining the mean density within the Roche lobe and the radius constrained from our spectral energy distribution fitting, we obtain the mass of the pre-ELM, M-1 = 0.176 +/- 0.014 M-circle dot. The joint fitting of light and radial velocity curves yields an inclination angle of i = 66.5(-1.7)(+1.4) degrees, corresponding to a mass of the compact object of M-2 = 1.09 +/- 0.05 M-circle dot. The very bloated pre-ELM has a smaller surface gravity (log g = 3.9 +/- 0.01, R-1 = 0.78 +/- 0.02 R-circle dot) than the known ELMs or pre-ELMs. The temperature and the luminosity (L-bol = 0.62 L-+0.11(-0.10)circle dot) of J0419 are close to those of the main sequence, which makes the selection of such systems through the H-R diagram inefficient. Based on the evolutionary model, the relatively long period and small log g indicate that J0419 could be close to the bifurcation period in the orbital evolution, which makes J0419 a unique source to connect ELM/pre-ELM WD systems, wide binaries, and cataclysmic variables. |
学科主题 | 天文学 ; 恒星与银河系 ; 恒星形成与演化 |
URL标识 | 查看原文 |
出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
资助项目 | National Key R&D Program of China[2021YFA1600401] ; National Natural Science Foundation of China[11925301] ; National Natural Science Foundation of China[12103041] ; National Natural Science Foundation of China[12033006] ; National Natural Science Foundation of China[11973002] ; National Natural Science Foundation of China[11988101] ; National Natural Science Foundation of China[11933004] ; National Natural Science Foundation of China[12090044] ; National Natural Science Foundation of China[11833006] ; National Natural Science Foundation of China[U1831205] ; National Natural Science Foundation of China[U1938105] |
WOS关键词 | TIME-SERIES ANALYSIS ; X-RAY BINARIES ; RED-GIANT STAR ; CATACLYSMIC VARIABLES ; MILLISECOND PULSAR ; EMISSION-LINE ; WHITE-DWARFS ; SKY SURVEY ; MASS ; PULSATIONS |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP Publishing Ltd |
WOS记录号 | WOS:000825101400001 |
资助机构 | National Key R&D Program of China[2021YFA1600401] ; National Natural Science Foundation of China[11925301, 12103041, 12033006, 11973002, 11988101, 11933004, 12090044, 11833006, U1831205, U1938105] |
内容类型 | 期刊论文 |
版本 | 出版稿 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/25340] |
专题 | 云南天文台_丽江天文观测站(南方基地) |
通讯作者 | Gu, Wei-Min; Sun, Mouyuan |
作者单位 | 1.WHU-NAOC Joint Center for Astronomy, Wuhan University, Wuhan 430072, People's Republic of China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, People's Republic of China; 3.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China; 4.Key laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210023, People's Republic of China; 5.Department of Astronomy, Nanjing University, Nanjing 210023, People's Republic of China; 6.Department of Physics, Hebei Normal University, Shijiazhuang 050024, People's Republic of China; 7.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China; 8.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China; 9.Department of Astronomy, Xiamen University, Xiamen, Fujian 361005, People's Republic of China; guwm@xmu.edu.cn, msun88@xmu.edu.cn; |
推荐引用方式 GB/T 7714 | Zhang, Zhi-Xiang,Zheng, Ling-Lin,Gu, Wei-Min,et al. A Long-period Pre-ELM System Discovered from the LAMOST Medium-resolution Survey[J]. ASTROPHYSICAL JOURNAL,2022,933(2). |
APA | Zhang, Zhi-Xiang.,Zheng, Ling-Lin.,Gu, Wei-Min.,Sun, Mouyuan.,Yi, Tuan.,...&Liu, Jifeng.(2022).A Long-period Pre-ELM System Discovered from the LAMOST Medium-resolution Survey.ASTROPHYSICAL JOURNAL,933(2). |
MLA | Zhang, Zhi-Xiang,et al."A Long-period Pre-ELM System Discovered from the LAMOST Medium-resolution Survey".ASTROPHYSICAL JOURNAL 933.2(2022). |
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