天苑增三

**天爐座α**
	; 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
赤緯	–28° 59′ 15.425″
視星等（V）	3.85
特性
光譜分類	F8IV
U−B 色指數	+0.082
B−V 色指數	+0.581
天體測定
徑向速度 (Rv)	–20.5 km/s
自行 (μ)	赤經：371.49 mas/yr ; 赤緯：612.28 mas/yr
視差 (π)	70.24 ± 0.45 mas
距離	46.4 ± 0.3 ly ; (14.24 ± 0.09 pc)
詳細資料
質量	1.33 ± 0.01 M☉
半徑	2.04 ± 0.06 R☉
表面重力 (log g)	4.27
亮度	4.87 ± 0.16 L☉
溫度	6,240 K
金屬量 [Fe/H]	–0.20 dex
自轉速度 (v sin i)	3.9 km/s
年齡	2.9 Gyr
其他命名
	12 Eridani, CD-29 1177, GJ 127, HD 20010, HIP 14879, HR 963, LTT 1512, SAO 168373.
參考資料庫
SIMBAD	資料

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。中國傳統名天苑增三^[9]，它在西洋的固有名稱是Dalim （出自皮亞齊的星表Palermo Catalogue（英語：Palermo Catalogue））^[10]^[11]^[12]和Fornacis（在Burritt（英語：Elijah Hinsdale Burritt）的星圖）^[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的次巨星^[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]，有着高自行運動^[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型主序星的時鐘座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[編輯]

^ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 Perryman, M. A. C.; et al. The HIPPARCOS Catalogue. Astronomy & Astrophysics. April 1997, 323: L49–L52. Bibcode:1997A&A...323L..49P.
^ ^2.0 ^2.1 ^2.2 LHS 1515 -- High proper-motion Star. SIMBAD. Centre de Données astronomiques de Strasbourg. [2010-05-10]. （原始內容存檔於2016-04-13）.
^ 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.
^ ^4.0 ^4.1 Rakos, K. D.; et al. Photometric and astrometric observations of close visual binaries. Astronomy and Astrophysics Supplement Series. February 1982, 47: 221–235. Bibcode:1982A&AS...47..221R.
^ Evans, D. S. The Revision of the General Catalogue of Radial Velocities. Batten, Alan Henry; Heard, John Frederick (編). 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. （原始內容存檔於2019-06-26）.
^ ^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. Bibcode:2001A&A...373.1019S. arXiv:astro-ph/0105216 . doi:10.1051/0004-6361:20010648.
^ ^7.0 ^7.1 ^7.2 Bruntt, H.; et al, Accurate fundamental parameters for 23 bright solar-type stars, Monthly Notices of the Royal Astronomical Society, July 2010, 405 (3): 1907–1923, Bibcode:2010MNRAS.405.1907B, arXiv:1002.4268 , doi:10.1111/j.1365-2966.2010.16575.x
^ ^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. Bibcode:2004A&A...418..989N. arXiv:astro-ph/0405198 . doi:10.1051/0004-6361:20035959. See VizierR catalogue V/130 （頁面存檔備份，存於互聯網檔案館）.
^ 伊世同《中西對照恆星圖表》
^ Piazzi, G (編). Praecipuarum Stellarum Inerrantium Positiones Mediae Ineunte Saeculo XIX: ex Observationibus Habitis in Specula Panormitana ab anno 1792 ad annum 1813. Palermo. 1814: 21.
^ Kunitzsch, P. Arabische Sternnamen in Europa. Wiesbaden: Otto Harrassowitz. 1959: 155.
^ Laffitte, R. Héritages arabes: Des noms arabes pour les étoiles 2^éme revue et corrigée. Paris: Librairie Orientaliste Paul Geunthner / Les Cahiers de l'Orient. 2005: 229.
^ Burritt, E. H. Atlas, Designed to Illustrate the Geography of the Heavens new. New York: F. J. Huntington. 1835. plate III.
^ 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. Bibcode:2005ApJ...627..974L. arXiv:astro-ph/0503520 . doi:10.1086/430416.
^ Söderhjelm, Staffan. Visual binary orbits and masses POST HIPPARCOS. Astronomy and Astrophysics. January 1999, 341: 121–140. Bibcode:1999A&A...341..121S.
^ Oudmaijer, Rene D.; et al. 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.
^ 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.
^ Gliese, W. Catalogue of Nearby Stars. Veröffentlichungen des Astronomischen Rechen-Instituts Heidelberg. 1969. Bibcode:1969VeARI..22....1G.
^ Deltorn, J.-M.; Kalas, P. Search for Nemesis Encounters with Vega, ε Eridani, and Fomalhaut. Ray Jayawardhana; Thomas Greene (編). Young Stars Near Earth: Progress and Prospects. ASP Conference Series 244. San Francisco: Astronomical Society of the Pacific: 227. 2001. Bibcode:2001ASPC..244..227D. ISBN 1-58381-082-X.

外部連結[編輯]

α For (Dalim)（頁面存檔備份，存於互聯網檔案館） - SKY-MAP.ORG（頁面存檔備份，存於互聯網檔案館）
LHL Digital Collections（頁面存檔備份，存於互聯網檔案館） - Linda Hall library（頁面存檔備份，存於互聯網檔案館）

[hipparcos-1] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 Perryman, M. A. C.; et al. The HIPPARCOS Catalogue. Astronomy & Astrophysics. April 1997, 323: L49–L52. Bibcode:1997A&A...323L..49P.

[SIMBAD-2] 2.0 ^2.1 ^2.2 LHS 1515 -- High proper-motion Star. SIMBAD. Centre de Données astronomiques de Strasbourg. [2010-05-10]. （原始內容存檔於2016-04-13）.

[aaa323-3] 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.

[aaass47-4] 4.0 ^4.1 Rakos, K. D.; et al. Photometric and astrometric observations of close visual binaries. Astronomy and Astrophysics Supplement Series. February 1982, 47: 221–235. Bibcode:1982A&AS...47..221R.

[rgcrc-5] Evans, D. S. The Revision of the General Catalogue of Radial Velocities. Batten, Alan Henry; Heard, John Frederick (編). 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. （原始內容存檔於2019-06-26）.

[aaa373-6] 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. Bibcode:2001A&A...373.1019S. arXiv:astro-ph/0105216 . doi:10.1051/0004-6361:20010648.

[mnras405_3_1907-7] 7.0 ^7.1 ^7.2 Bruntt, H.; et al, Accurate fundamental parameters for 23 bright solar-type stars, Monthly Notices of the Royal Astronomical Society, July 2010, 405 (3): 1907–1923, Bibcode:2010MNRAS.405.1907B, arXiv:1002.4268 , doi:10.1111/j.1365-2966.2010.16575.x

[aaa418-8] 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. Bibcode:2004A&A...418..989N. arXiv:astro-ph/0405198 . doi:10.1051/0004-6361:20035959. See VizierR catalogue V/130 （頁面存檔備份，存於互聯網檔案館）.

[9] 伊世同《中西對照恆星圖表》

[10] Piazzi, G (編). 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 2^éme 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.

[apj627_2-14] 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. Bibcode:2005ApJ...627..974L. arXiv:astro-ph/0503520 . doi:10.1086/430416.

[aaa341-15] Söderhjelm, Staffan. Visual binary orbits and masses POST HIPPARCOS. Astronomy and Astrophysics. January 1999, 341: 121–140. Bibcode:1999A&A...341..121S.

[aaass96_3-16] Oudmaijer, Rene D.; et al. 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.

[Fuhrmann2015-17] 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.

[gliese-18] Gliese, W. Catalogue of Nearby Stars. Veröffentlichungen des Astronomischen Rechen-Instituts Heidelberg. 1969. Bibcode:1969VeARI..22....1G.

[deltorn_kalas01-19] Deltorn, J.-M.; Kalas, P. Search for Nemesis Encounters with Vega, ε Eridani, and Fomalhaut. Ray Jayawardhana; Thomas Greene (編). Young Stars Near Earth: Progress and Prospects. ASP Conference Series 244. San Francisco: Astronomical Society of the Pacific: 227. 2001. Bibcode:2001ASPC..244..227D. ISBN 1-58381-082-X.

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觀測資料曆元 J2000
天爐座α的位置（左上）
星座	天爐座
星官	天苑（昴宿）
赤經	3^h 12^m 04.5277^s^[1]
赤緯	–28° 59′ 15.425″^[1]
視星等（V）	3.85^[2]
特性
光譜分類	F8IV^[3]
U−B 色指數	+0.082^[4]
B−V 色指數	+0.581^[4]
天體測定

徑向速度 (R_v)	–20.5^[5] km/s
自行 (μ)	赤經：371.49^[1] mas/yr 赤緯：612.28^[1] mas/yr
視差 (π)	70.24 ± 0.45^[1] mas
距離	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
金屬量 [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	資料