唧筒座AG

**HR 4049**
觀測資料; 曆元 J2000.0
星座	唧筒座
星官
赤經	10h 18m 07.59s
赤緯	–28° 59′ 31.2″
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 mas/yr ; 赤緯：10.85 ± 0.38 mas/yr
視差 (π)	1.23 ± 0.36 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 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	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

[van_Leeuwen2007-1] 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）

[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 .

[Takeda-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. （原始內容存檔於2019-08-12）（英語）.

[Malek-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 （英語）.

[SIMBAD-5] 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）.

[Astron-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 （英語）.

[Waelkens-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.

[Geballe-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. （原始內容存檔於2017-11-20）（英語）.

[AAVSO-9] 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）.

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