唧筒座AG
觀測資料 曆元 J2000.0 | |
---|---|
星座 | 唧筒座 |
星官 | |
赤經 | 10h 18m 07.59s[1] |
赤緯 | –28° 59′ 31.2″[1] |
視星等(V) | 5.53 |
特性 | |
光譜分類 | B9.5Ib-II |
B−V 色指數 | 0.23 |
變星類型 | 原行星雲(Post-AGB Star) |
天體測定 | |
徑向速度 (Rv) | -33 km/s |
自行 (μ) | 赤經:–15.86 ± 0.32[1] mas/yr 赤緯:10.85 ± 0.38[1] mas/yr |
視差 (π) | 1.23 ± 0.36[1] mas |
距離 | approx. 2,700 ly (approx. 800 pc) |
絕對星等 (MV) | -3.68 |
詳細資料 | |
質量 | 1.2 M☉ |
半徑 | 15.1 [2] R☉ |
亮度 | 3823 L☉ |
溫度 | 11500 K |
其他命名 | |
參考資料庫 | |
SIMBAD | 資料 |
唧筒座AG ,也稱為HD 89353和 HR 4049,是顆位於唧筒座的前漸近巨星分支恆星。一顆非常貧金屬星[3],它被富含幾種分子的一層厚厚聯星拱星盤環繞着[4],視星等5.53等,在理想的條件下隨時都可以用裸眼看見這顆恆星[5]。這顆恆星的距離大約是813秒差距(2,650光年)[5],已經被證實是聯星 [6];然而,像許多單獨的特殊恆星一樣,這顆恆星有着獨特的頻譜。這顆恆星基於其巴耳末系的譜線,是顆藍超巨星,實際上它是顆位於前漸近巨星分支階段的老年低質量恆星[7]。這顆恆星正在進行激烈的質量損失[8],唯一改變的是在5.29和5.83星等間,以429天的週期改變光度[9]。
參考資料
- ^ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664 [2015-06-11]. Bibcode:2007A&A...474..653V. arXiv:0708.1752
. doi:10.1051/0004-6361:20078357. (原始內容存檔於2019-03-28).Vizier catalog entry (頁面存檔備份,存於互聯網檔案館)
- ^ Bakker; et al. Spectral variability of the binary HR 4049. Astronomy and Astrophysics. 1998, 336 (1): 263–275. Bibcode:1998A&A...336..263B. arXiv:astro-ph/9802120
.
- ^ Yoichi Takeda, Mudumba Parthasarathy, Wako Aoki, Yoshifusa Ita, Yoshikazu Nakada, Hideyuki Izumiura, Kunio Noguchi, Masahide Takada-Hidai, Bun』ei Sato, Akito Tajitsu, Satoshi Honda, Satoshi Kawanomoto, Hiroyasu Ando, Hiroshi Karoji. Detection of Zinc in the Very Metal-Poor Post-AGB Star HR 4049. Publications of the Astronomical Society of Japan. 2002-10-25, 54 (5): 765–773 [2018-04-02]. ISSN 0004-6264. doi:10.1093/pasj/54.5.765. (原始內容存檔於2019-08-12) (英語).
- ^ S. E. Malek, J. Cami. The Gas-rich Circumbinary Disk of HR 4049. I. A Detailed Study of the Mid-infrared Spectrum. The Astrophysical Journal. 2014, 780 (1): 41 [2018-04-02]. ISSN 0004-637X. doi:10.1088/0004-637x/780/1/41 (英語).
- ^ 5.0 5.1 AG Antliae. SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. [15 June 2014]. (原始內容存檔於2019-08-10).
- ^ B. Acke, P. Degroote, R. Lombaert, B. L. de Vries, K. Smolders, T. Verhoelst, E. Lagadec, C. Gielen, H. Van Winckel, C. Waelkens. Amorphous carbon in the disk around the post-AGB binary HR 4049. Astronomy & Astrophysics. 2013-03-01, 551 [2018-04-02]. ISSN 0004-6361. doi:10.1051/0004-6361/201219282 (英語).
- ^ Waelkens, C.; Lamers, H.; Waters, R. HR 4049 - an old low-mass star disguised as a young massive supergiant. ESO Messenger. September 1987, 49: 29–32. Bibcode:1987Msngr..49...29W.
- ^ T. R. Geballe, K. S. Noll, D. C. B. Whittet, L. B. F. M. Waters. Unusual features of the 1-4 micron spectrum of HR 4049. The Astrophysical Journal. May 1989, 340: L29–L32 [2018-04-02]. ISSN 0004-637X. doi:10.1086/185431. (原始內容存檔於2017-11-20) (英語).
- ^ VSX. AG Antliae. The International Variable Star Index. American Association of Variable Star Observers. 4 January 2010 [15 June 2013]. (原始內容存檔於2021-01-05).
外部連結
- The Spatial Distribution of Grains Around the Dual Chemistry Post-AGB Star
- Synthetic post-AGB evolution
- Non-linear radiative models of post-AGB stars: Application to HD 56126
- Post-AGB stars as testbeds of nucleosynthesis in AGB stars
- The post-AGB evolution of AGB mass loss variations