天爐座α

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天爐座α
Fornax constellation map.png
天爐座α的位置(左上)
觀測資料
曆元 J2000
星座 天爐座
星官 天苑昴宿
赤經 3h 12m 04.5277s[1]
赤緯 –28° 59′ 15.425″[1]
視星等(V) 3.85[2]
特性
光谱分类 F8IV[3]
U−B 色指数 +0.082[4]
B−V 色指数 +0.581[4]
天体测定
径向速度 (Rv) –20.5[5] km/s
自行 (μ) 赤经:371.49[1] mas/yr
赤纬:612.28[1] mas/yr
视差 (π) 70.24 ± 0.45[1] mas
距离 46.4 ± 0.3 ly
(14.24 ± 0.09 pc)
詳細資料
質量 1.33 ± 0.01[6] M
半徑 2.04 ± 0.06[7] R
表面重力 (log g) 4.27[6]
亮度 4.87 ± 0.16[7] L
溫度 6,240[6] K
金属量 [Fe/H] –0.20[6] dex
自轉速度 (v sin i) 3.9[7] km/s
年齡 2.9[8] Gyr
其他命名
12 Eridani, CD-29 1177, GJ 127, HD 20010, HIP 14879, HR 963, LTT 1512, SAO 168373.[2]
參考資料庫
SIMBAD data

天爐座α(α Fornacis, α For)是天爐座最亮的恆星,但只比4等星亮一點。中國傳統名天苑增十七[9],它在西洋的固有名稱是Dalim (出自皮亞齊的星表Palermo Catalogue英语Palermo Catalogue[10][11][12]Fornacis(在Burritt英语Elijah Hinsdale Burritt星圖[13]。這顆恆星最初的名稱是 波江座12

天爐座α的光譜類型是F8IV,其中的IV表示它的亮度是在演化上已經離開主序星次巨星[14]。它的質量比太陽重約33%,年齡是29億歲[6][8]。天爐座α是一對聯星 [15],有著高自行運動[2]。這個系統顯示出紅外過量,暗示可能有類似岩屑盤的拱星盤[16]

第二顆恆星已經被確認是顆藍掉隊星,它可能是合併了之前存在的第三顆恆星,或是累積了它的物質。它是個強X射線源,質量約為太陽的78% [17]

這顆恆星的空間速度元件是(U、 V、 W) = (–35,+ 20,+ 30)km/s[18]。大約35萬年前,天爐座α星曾於A型主序星時鐘座ν有過一次親密的接觸。估計曾互相接近至0.265 ly(0.081 pc)的距離,使這兩顆恆星都有岩屑盤[19]

參考資料[编辑]

  1. ^ 1.0 1.1 1.2 1.3 1.4 Perryman, M. A. C.; 等. The HIPPARCOS Catalogue. Astronomy & Astrophysics. April 1997, 323: L49–L52. Bibcode:1997A&A...323L..49P. 
  2. ^ 2.0 2.1 2.2 LHS 1515 -- High proper-motion Star. SIMBAD. Centre de Données astronomiques de Strasbourg. [2010-05-10]. 
  3. ^ Favata, F.; Micela, G.; Sciortino, S. The [Fe/H] distribution of a volume limited sample of solar-type stars and its implications for galactic chemical evolution.. Astronomy and Astrophysics. July 1997, 323: 809–818. Bibcode:1997A&A...323..809F. 
  4. ^ 4.0 4.1 Rakos, K. D.; 等. Photometric and astrometric observations of close visual binaries. Astronomy and Astrophysics Supplement Series. February 1982, 47: 221–235. Bibcode:1982A&AS...47..221R. 
  5. ^ Evans, D. S. The Revision of the General Catalogue of Radial Velocities. (编) Batten, Alan Henry; Heard, John Frederick. Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. June 20–24, 1966 [2009-09-10]. Bibcode:1967IAUS...30...57E. 
  6. ^ 6.0 6.1 6.2 6.3 6.4 Santos, N. C.; Israelian, G.; Mayor, M. The metal-rich nature of stars with planets. Astronomy and Astrophysics. July 2001, 373 (3): 1019–1031. arXiv:astro-ph/0105216. Bibcode:2001A&A...373.1019S. doi:10.1051/0004-6361:20010648. 
  7. ^ 7.0 7.1 7.2 Bruntt, H.; 等, Accurate fundamental parameters for 23 bright solar-type stars, Monthly Notices of the Royal Astronomical Society, July 2010, 405 (3): 1907–1923, arXiv:1002.4268, Bibcode:2010MNRAS.405.1907B, doi:10.1111/j.1365-2966.2010.16575.x 
  8. ^ 8.0 8.1 Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S.; Mowlavi, N. The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs. Astronomy and Astrophysics. May 2004, 418 (3): 989–1019. arXiv:astro-ph/0405198. Bibcode:2004A&A...418..989N. doi:10.1051/0004-6361:20035959.  See VizierR catalogue V/130.
  9. ^ 伊世同 《中西对照恒星图表》
  10. ^ Piazzi, G (编). Praecipuarum Stellarum Inerrantium Positiones Mediae Ineunte Saeculo XIX: ex Observationibus Habitis in Specula Panormitana ab anno 1792 ad annum 1813. Palermo. 1814: 21. 
  11. ^ Kunitzsch, P. Arabische Sternnamen in Europa. Wiesbaden: Otto Harrassowitz. 1959: 155. 
  12. ^ Laffitte, R. Héritages arabes: Des noms arabes pour les étoiles 2éme revue et corrigée. Paris: Librairie Orientaliste Paul Geunthner / Les Cahiers de l'Orient. 2005: 229. 
  13. ^ Burritt, E. H. Atlas, Designed to Illustrate the Geography of the Heavens new. New York: F. J. Huntington. 1835.  plate III.
  14. ^ Lopez, Bruno; Schneider, Jean; Danchi, William C. Can Life Develop in the Expanded Habitable Zones around Red Giant Stars?. The Astrophysical Journal. July 2005, 627 (2): 974–985. arXiv:astro-ph/0503520. Bibcode:2005ApJ...627..974L. doi:10.1086/430416. 
  15. ^ Söderhjelm, Staffan. Visual binary orbits and masses POST HIPPARCOS. Astronomy and Astrophysics. January 1999, 341: 121–140. Bibcode:1999A&A...341..121S. 
  16. ^ Oudmaijer, Rene D.; 等. SAO stars with infrared excess in the IRAS Point Source Catalog. Astronomy and Astrophysics Supplement Series. December 1992, 96 (3): 625–643. Bibcode:1992A&AS...96..625O. 
  17. ^ Fuhrmann, K.; Chini, R., Multiplicity among F-type Stars. II, The Astrophysical Journal, August 2015, 809 (1): 19, Bibcode:2015ApJ...809..107F, doi:10.1088/0004-637X/809/1/107, 107. 
  18. ^ Gliese, W. Catalogue of Nearby Stars. Veröffentlichungen des Astronomischen Rechen-Instituts Heidelberg. 1969. Bibcode:1969VeARI..22....1G. 
  19. ^ Deltorn, J.-M.; Kalas, P. Search for Nemesis Encounters with Vega, ε Eridani, and Fomalhaut. (编) Ray Jayawardhana; Thomas Greene. Young Stars Near Earth: Progress and Prospects. ASP Conference Series. San Francisco: Astronomical Society of the Pacific: 227. 2001. Bibcode:2001ASPC..244..227D. ISBN 1-58381-082-X. 

外部連結[编辑]