唧筒座AG ,也稱為HD 89353 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著[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,這顆恆星有著獨特的頻譜。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]

HR 4049
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
光谱分类B9.5Ib-II
B−V 色指数0.23
变星类型原行星雲(Post-AGB Star)
天体测定
徑向速度 (Rv)-33 km/s
自行 (μ) 赤经:–15.86 ± 0.32[1] mas/yr
赤纬:10.85 ± 0.38[1] mas/yr
视差 (π)1.23 ± 0.36[1] mas
距离approx. 2,700 ly
(approx. 800 pc)
绝对星等 (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
AG Antliae, CD-28° 8070, 2MASS J10180758-2859308, GSC 06630-01759, HD 89353, FK5 1265, PPM 257470, HIP 50456, SAO 178644, HR 4049.
參考資料庫
SIMBAD资料

參考資料

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  1. ^ 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. (原始内容存档于2019-03-28). Vizier catalog entry 页面存档备份,存于互联网档案馆
  2. ^ 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 . 
  3. ^ 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. (原始内容存档于2019-08-12) (英语). 
  4. ^ 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 (英语). 
  5. ^ 5.0 5.1 AG Antliae. SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. [15 June 2014]. (原始内容存档于2019-08-10). 
  6. ^ 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 (英语). 
  7. ^ 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. 
  8. ^ 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. (原始内容存档于2017-11-20) (英语). 
  9. ^ VSX. AG Antliae. The International Variable Star Index. American Association of Variable Star Observers. 4 January 2010 [15 June 2013]. (原始内容存档于2021-01-05). 

外部連結

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