三角形二
（重定向自南三角座β）
  | |
| 觀測資料 曆元 J2000 | |
|---|---|
| 星座 | 南三角座 |
| 星官 | |
| 赤經 | 15h 55m 08.56206s[1] |
| 赤緯 | −63° 25′ 50.6155″[1] |
| 視星等（V） | 2.85[2] |
| 特性 | |
| 光谱分类 | F1 V[3] |
| U−B 色指数 | +0.05[2] |
| B−V 色指数 | +0.29[2] |
| 天体测定 | |
| 徑向速度 (Rv) | +0.4[4] km/s |
| 自行 (μ) | 赤经：−188.66[1] mas/yr 赤纬：−401.85[1] mas/yr |
| 视差 (π) | 80.79 ± 0.16[1] mas |
| 距离 | 40.37 ± 0.08 ly (12.38 ± 0.02 pc) |
| 绝对星等 (MV) | +2.37[5] |
| 詳細資料 [6] | |
| 質量 | 1.56[7] M☉ |
| 半徑 | 1.976±0.021 R☉ |
| 表面重力 (log g) | 4.219±0.066[8] |
| 亮度 | 9.30±0.17 L☉ |
| 溫度 | 7,171±35 K |
| 金属量 [Fe/H] | −0.29±0.10 dex |
| 自轉速度 (v sin i) | 69.63 km/s |
| 年齡 | 674[7] Myr |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 资料 |
三角形二，拜耳名稱為南三角座β，拉丁化的名稱為β Trianguli Australis，是在南天星座南三角座的一對雙星。它距離地球大約是40.37光年（12.38秒差距），視星等為+2.85等[2]。這顆恆星在天球上有相對較高的自行速率[9]。它是一顆F型主序星，恆星分類為F1V[3]。三角形二的光學伴星視星等14等，角距離155弧秒。
史匹哲太空望遠鏡進行的觀測揭示了這顆恆星的過量紅外發射。這表明該系統中存在星周物質，使其成為岩屑盤的候選者[10]。這顆恆星可能是繪架座β移動星群的成員，這是一個由大約17顆恆星組成的星群，它們有著共同的起源和相似的空間運動。如果它是這一群體的成員，那麼三角形二的年齡約為1,200萬年；與星群本身相同[11]。
現代遺產
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, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, S2CID 18759600, arXiv:0708.1752
, doi:10.1051/0004-6361:20078357
- ^ 2.0 2.1 2.2 2.3 Nicolet, B. Photoelectric photometric Catalogue of homogeneous measurements in the UBV System. Astronomy and Astrophysics Supplement Series. October 1978, 34: 1–49. Bibcode:1978A&AS...34....1N.
- ^ 3.0 3.1 Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample, The Astronomical Journal, July 2006, 132 (1): 161–170, Bibcode:2006AJ....132..161G, S2CID 119476992, arXiv:astro-ph/0603770 , doi:10.1086/504637
- ^ 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 30, University of Toronto: International Astronomical Union: 57, June 20–24, 1966, Bibcode:1967IAUS...30...57E
- ^ Anderson, E.; Francis, Ch., XHIP: An extended hipparcos compilation, Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, S2CID 119257644, arXiv:1108.4971 , doi:10.1134/S1063773712050015.
- ^ Rains, Adam D.; et al, Precision angular diameters for 16 southern stars with VLTI/PIONIER, Monthly Notices of the Royal Astronomical Society, April 2020, 493 (2): 2377–2394, Bibcode:2020MNRAS.493.2377R, arXiv:2004.02343 , doi:10.1093/mnras/staa282
- ^ 7.0 7.1 David, Trevor J.; Hillenbrand, Lynne A., The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets, The Astrophysical Journal, 2015, 804 (2): 146, Bibcode:2015ApJ...804..146D, S2CID 33401607, arXiv:1501.03154 , doi:10.1088/0004-637X/804/2/146.
- ^ Allende Prieto, C.; et al, S4N: A spectroscopic survey of stars in the solar neighborhood. The Nearest 15 pc, Astronomy and Astrophysics, June 2004, 420: 183–205, Bibcode:2004A&A...420..183A, S2CID 14393039, arXiv:astro-ph/0403108 , doi:10.1051/0004-6361:20035801
- ^ 9.0 9.1 LTT 6339 -- High proper-motion Star, SIMBAD (Centre de Données astronomiques de Strasbourg), [2012-01-28]
- ^ Koerner, D. W.; et al, New Debris Disk Candidates Around 49 Nearby Stars (PDF), The Astrophysical Journal Letters, February 2010, 710 (1): L26–L29, Bibcode:2010ApJ...710L..26K, S2CID 122844702, doi:10.1088/2041-8205/710/1/L26
- ^ Nakajima, Tadashi; Morino, Jun-Ichi; Fukagawa, Misato, Potential Members of Stellar Kinematical Groups within 20 pc of the Sun, The Astronomical Journal, September 2010, 140 (3): 713–722, Bibcode:2010AJ....140..713N, doi:10.1088/0004-6256/140/3/713
- ^ Astronomy of the Brazilian Flag, FOTW Flags Of The World website
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