三角形二

三角形二拜耳名称南三角座β拉丁化的名称为β Trianguli Australis,是在南天星座南三角座的一对双星。它距离地球大约是40.37光年(12.38秒差距),视星等为+2.85等[2]。这颗恒星在天球上有相对较高的自行速率[9]。它是一颗F型主序星恒星分类为F1V[3]。三角形二的光学伴星视星等14等,角距离155弧秒

三角形二
三角形二的位置(红圈)
观测资料
历元 J2000
星座 南三角座
星官
赤经 15h 55m 08.56206s[1]
赤纬 −63° 25′ 50.6155″[1]
视星等(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
径向速度 (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]
详细资料 [6]
质量1.56[7] M
半径1.976±0.021 R
表面重力 (log g)4.219±0.066[8]
亮度9.30±0.17 L
温度7,171±35 K
金属量 [Fe/H]−0.29±0.10 dex
自转速度 (v sin i)69.63 km/s
年龄674[7] Myr
其他命名
β TrA、​CD−63° 1135、​FK5 589、​GJ 601、​HD 141891、​HIP 77952、​HR 5897、​SAO 253346、​LTT 6339[9]
参考数据库
SIMBAD资料

史匹哲太空望远镜进行的观测揭示了这颗恒星的过量红外发射。这表明该系统中存在星周物质,使其成为岩屑盘的候选者[10]。这颗恒星可能是绘架座β移动星群的成员,这是一个由大约17颗恒星组成的星群,它们有着共同的起源和相似的空间运动。如果它是这一群体的成员,那么三角形二的年龄约为1,200万年;与星群本身相同[11]

现代遗产

三角形二出现在巴西国旗上,象征圣卡塔琳娜州[12]

参考资料

  1. ^ 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. ^ 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. ^ 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 
  4. ^ 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 
  5. ^ 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. 
  6. ^ 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. ^ 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. 
  8. ^ 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. ^ 9.0 9.1 LTT 6339 -- High proper-motion Star, SIMBAD (Centre de Données astronomiques de Strasbourg), [2012-01-28], (原始内容存档于2024-04-11) 
  10. ^ Koerner, D. W.; et al, New Debris Disk Candidates Around 49 Nearby Stars (PDF), The Astrophysical Journal Letters, February 2010, 710 (1): L26–L29 [2024-02-28], Bibcode:2010ApJ...710L..26K, S2CID 122844702, doi:10.1088/2041-8205/710/1/L26, (原始内容存档 (PDF)于2020-09-15) 
  11. ^ 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  
  12. ^ Astronomy of the Brazilian Flag, FOTW Flags Of The World website, [2024-02-28], (原始内容存档于2017-04-30)