 天炉座α的位置（左上） | |
| 观测资料 历元 J2000 | |
|---|---|
| 星座 | 天炉座 |
| 星官 | 天苑（昴宿） |
| 赤经 | 3h 12m 04.5277s[1] |
| 赤纬 | –28° 59′ 15.425″[1] |
| 视星等（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) |
| 详细资料 | |
| 质量 | 1.33 ± 0.01[6] M☉ |
| 半径 | 2.04 ± 0.06[7] R☉ |
| 表面重力 (log g) | 4.27[6] |
| 亮度 | 4.87 ± 0.16[7] L☉ |
| 温度 | 6,240[6] K |
| 金属量 [Fe/H] | –0.20[6] dex |
| 自转速度 (v sin i) | 3.9[7] km/s |
| 年龄 | 2.9[8] Gyr |
| 其他命名 | |
| 参考数据库 | |
| SIMBAD | data |
天炉座α（α Fornacis, α For）是天炉座最亮的恒星，但只比4等星亮一点。中国传统名天苑增三[9]，它在西洋的固有名称是Dalim （出自皮亚齐的星表Palermo Catalogue）[10][11][12]和Fornacis（在Burritt的星图）[13]。这颗恒星最初的名称是 波江座12。
天炉座α的光谱类型是F8IV，其中的IV表示它的亮度是在演化上已经离开主序星的次巨星[14]。它的质量比太阳重约33%，年龄是29亿岁[6][8]。天炉座α是一对联星 [15]，有着高自行运动[2]。这个系统显示出红外过量，暗示可能有类似岩屑盘的拱星盘[16]
第二颗恒星已经被确认是颗蓝掉队星，它可能是合并了之前存在的第三颗恒星，或是累积了它的物质。它是个强X射线源，质量约为太阳的78% [17]。
这颗恒星的空间速度元件是（U、 V、 W） = （–35，+ 20，+ 30）km/s[18]。大约35万年前，天炉座α星曾于A型主序星的时钟座ν有过一次亲密的接触。估计曾互相接近至0.265 ly（0.081 pc）的距离，使这两颗恒星都有岩屑盘[19]。
参考资料
- ↑ 1.0 1.1 1.2 1.3 1.4 Perryman, M. A. C.; et al. The HIPPARCOS Catalogue. Astronomy & Astrophysics. 1997-04, 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].
- ↑ 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. 1997-07, 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. 1982-02, 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 (编). 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.
- ↑ 6.0 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. 2001-07, 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, 2010-07, 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. 2004-05, 418 (3): 989–1019. Bibcode:2004A&A...418..989N. arXiv:astro-ph/0405198 . doi:10.1051/0004-6361:20035959. See VizierR catalogue V/130 .
- ↑ 伊世同 《中西对照恒星图表》
- ↑ 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.
- ↑ Kunitzsch, P. Arabische Sternnamen in Europa. Wiesbaden: Otto Harrassowitz. 1959: 155.
- ↑ 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.
- ↑ 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. 2005-07, 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. 1999-01, 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. 1992-12, 96 (3): 625–643. Bibcode:1992A&AS...96..625O.
- ↑ Fuhrmann, K.; Chini, R., Multiplicity among F-type Stars. II, The Astrophysical Journal, 2015-08, 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 (编). 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.