Discovery of a hot post-AGB star in Galactic globular cluster E3
文献类型：期刊论文
| 作者 | Kumar, R.6,7; Moharana, A.1; Piridi, S.6; Pradhan, A. C.6; Helminiak, K. G.1; Ikonnikova, N.5; Dodin, A.5; Szczerba, R.1,3 ; Giersz, M.4; Ojha, D. K.2
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2024-05-08 |
| 卷号 | 685页码:L6 |
| 关键词 | stars: abundances stars: AGB and post-AGB binaries: spectroscopic stars: evolution ultraviolet: stars galaxies: star clusters: individual: E3 |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202449777 |
| 产权排序 | 8 |
| 英文摘要 | We report a new hot post-asymptotic giant branch (PAGB) star in the Galactic globular cluster (GC) E3, which is one of the first of the identified PAGB stars in a GC to show a binary signature. The star stands out as the brightest source in E3 in the Astrosat/UVIT images. We confirmed its membership with the cluster E3 using Gaia DR3 kinematics and parallax measurements. We supplemented the photometric observations with radial velocities (RVs) from high-resolution spectroscopic observations at two epochs and with ground- and space-based photometric observations from 0.13 mu m to 22 mu m. We find that the RVs vary over similar to 6 km s(-1) between the two epochs. This is an indication of the star being in a binary orbit. A simulation of possible binary systems with the observed RVs suggests a binary period of either 39.12 days or 17.83 days with mass ratio q >= 1.0. The [Fe/H] derived using the high-resolution spectra is similar to-0.7 dex, which closely matches the cluster metallicity. The spectroscopic and photometric measurements suggest T-eff and logg of the star as 17 500 +/- 1000 K and 2.37 +/- 0.20 dex, respectively. Various PAGB evolutionary tracks on the Hertzsprung-Russell (H-R) diagram suggest a current mass of the star in the range 0.51-0.55 M-circle dot. The star is enriched with C and O abundances, showing similar CNO abundances compared to the other PAGB stars in GCs with the evidence of the third dredge-up on the AGB phase. |
| WOS关键词 | UV-BRIGHT STARS ; BLANKETED MODEL ATMOSPHERES ; GIANT BRANCH STARS ; STELLAR POPULATIONS ; ECLIPSING BINARIES ; GAIA EDR3 ; PARAMETERS ; CATALOG ; MILKY ; VIEW |
| 资助项目 | National Science Center (NCN), Poland[2021/41/N/ST9/02746] ; NCN grant ; Indian Space Research Organisation (ISRO) under the AstroSat archival Data utilization program[DS_2B-13013(2)/1/2022-Sec.2] ; NCN[UMO-2021/41/B/ST9/01191] ; Department of Atomic Energy, Government of India[RTI 4002] ; Department of Space, Government of India |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001223785800006 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | National Science Center (NCN), Poland ; NCN grant ; Indian Space Research Organisation (ISRO) under the AstroSat archival Data utilization program ; NCN ; Department of Atomic Energy, Government of India ; Department of Space, Government of India |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/6832]  |
| 专题 | 研究单元未命名 天体化学研究团组 |
| 通讯作者 | Kumar, R.; Pradhan, A. C. |
| 作者单位 | 1.Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Rabianska 8, PL-87100 Torun, Poland 2.Tata Inst Fundamental Res, Dept Astron & Astrophys, Mumbai 400005, India 3.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China 4.Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Ul Bartycka 18, PL-00716 Warsaw, Poland 5.Lomonosov Moscow State Univ, Sternberg Astron Inst, Univ Ave 13, Moscow 119234, Russia 6.Natl Inst Technol, Dept Phys & Astron, Rourkela 769008, Odisha, India 7.Phys Res Lab, Astron & Astrophys Div, Ahmadabad 380009, Gujarat, India |
| 推荐引用方式 GB/T 7714 | Kumar, R.,Moharana, A.,Piridi, S.,et al. Discovery of a hot post-AGB star in Galactic globular cluster E3[J]. ASTRONOMY & ASTROPHYSICS,2024,685:L6. |
| APA | Kumar, R..,Moharana, A..,Piridi, S..,Pradhan, A. C..,Helminiak, K. G..,...&Samal, M. R..(2024).Discovery of a hot post-AGB star in Galactic globular cluster E3.ASTRONOMY & ASTROPHYSICS,685,L6. |
| MLA | Kumar, R.,et al."Discovery of a hot post-AGB star in Galactic globular cluster E3".ASTRONOMY & ASTROPHYSICS 685(2024):L6. |
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