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| The Population Synthesis of Wolf-Rayet Stars Involving Binary Merger Channels | |
Zhuowen Li1; Chunhua Zhu1 ; Guoliang Lü1,2; Lin Li1; Helei Liu1; Sufen Guo1; Jinlong Yu3; Xizhen Lu1
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| 2024-07-01 | |
| Source Publication | Astrophysical Journal
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| ISSN | 0004-637X |
| Volume | 969Issue:2Pages:11160 |
| Contribution Rank | 2 |
| Abstract | Wolf-Rayet (W-R) stars are very important massive stars. However, their origin and the observed binary fraction within the entire W-R population are still debated. We investigate some possible merger channels for the formation of W-R stars, including main sequence (MS)/Hertzsprung gap (HG) + MS, He + HG/giant branch (GB). We find that many products produced via binary merger can evolve into W-R stars, the MS/HG + MS merger channel can explain W-R stars with luminosities higher than similar to 105.4 L circle dot, while the He + HG/GB merger channel can explain low-luminosity W-R stars in the range of 104.7 L circle dot similar to 105.5 L circle dot. In the population synthesis analysis of W-R stars, we assume an initial binary fraction (f ini,bin) of 50% and 100% for massive stars. We also assume that MS/HG + MS merger products are nonrotating or rapidly rotating (omega/omega crit = 0.8). In different cases, the calculated single fractions of W-R stars range from 22.2%-60.6% in the Milky Way (MW) and from 8.3%-70.9% in the Large Magellanic Cloud (LMC). The current observations fall within the range of our calculations. When the merger product of MS/HG + MS rotates rapidly, we estimate that there are approximately 1015-1396 W-R stars in the MW and 128-204 W-R stars in the LMC. Our model also roughly reproduces the observed single-peak luminosity distribution of W-R stars in the MW. However, the weak bimodal luminosity distribution observed in the LMC is not reproduced in our model. We assess that this may be due to the model underestimating the mass-loss rate in the LMC. In conclusion, we consider that the binary merger is a significant formation channel for W-R formation, and can explain the observed high fraction of the single W-R stars in the total population. |
| Keyword | large-magellanic-cloud spectroscopic multiplicity survey common envelope evolution black-hole binaries mass-loss rates stellar evolution presupernova evolution modern search model grids o-stars Astronomy & Astrophysics |
| Subtype | Article |
| DOI | 10.3847/1538-4357/ad4da8 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:001268276900001 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/7621 |
| Collection | 射电天文研究室_理论天体物理研究团组 |
| Affiliation | 1.School of Physical Science and Technology, Xinjiang University, Urumqi, 830046, Peopleʼs Republic of China; 2.Xinjiang Observatory, the Chinese Academy of Sciences, Urumqi, 830011, Peopleʼs Republic of China; 3.College of Mechanical and Electronic Engineering, Tarim University, Alar, 843300, Peopleʼs Republic of China |
| Recommended Citation GB/T 7714 | Zhuowen Li,Chunhua Zhu,Guoliang Lü,et al. The Population Synthesis of Wolf-Rayet Stars Involving Binary Merger Channels[J]. Astrophysical Journal,2024,969(2):11160. |
| APA | Zhuowen Li.,Chunhua Zhu.,Guoliang Lü.,Lin Li.,Helei Liu.,...&Xizhen Lu.(2024).The Population Synthesis of Wolf-Rayet Stars Involving Binary Merger Channels.Astrophysical Journal,969(2),11160. |
| MLA | Zhuowen Li,et al."The Population Synthesis of Wolf-Rayet Stars Involving Binary Merger Channels".Astrophysical Journal 969.2(2024):11160. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| Li-2024-The Populati（3689KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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