建五
建五(Rho1 Sagittarii,拉丁化)是人马座的一颗恒星[13],是位于人马座南侧的一颗变星变星。它具有白色色调,肉眼可见,视星等在3.93左右变动[2]。根据视差,这颗恒星距离太阳系大约127光年[1],并以+1.2公里/秒的径向速度远离太阳系[5]。它位于黄道附近,因此可以被月球掩蔽[14]。此外,太阳系的行星如水星与金星等也可能遮掩它,但这现象非常罕见。下一次被行星遮掩将发生在2046年2月23日,人马座ρ¹被金星遮掩。
观测资料 历元 J2000 | |
---|---|
星座 | 人马座 |
星官 | 建(斗宿) |
赤经 | 19h 21m 40.35942s[1] |
赤纬 | -17° 50′ 49.9168″[1] |
视星等(V) | 3.93[2] |
特性 | |
光谱分类 | A9IV[3] |
U−B 色指数 | +0.14[2] |
B−V 色指数 | +0.22[2] |
变星类型 | 盾牌座δ型变星[4] |
天体测定 | |
径向速度 (Rv) | +1.20[5] km/s |
自行 (μ) | 赤经:−25.87[1] mas/yr 赤纬:+21.46[1] mas/yr |
视差 (π) | 25.69 ± 0.19[1] mas |
距离 | 127.0 ± 0.9 ly (38.9 ± 0.3 pc) |
绝对星等 (MV) | 0.97[6] |
详细资料 | |
质量 | 1.91[7] M☉ |
半径 | +0.24 −0.26 3.31[8] R☉ |
表面重力 (log g) | 3.89[9] |
亮度 | ±0.8 30.7[8] L☉ |
温度 | +201 −261 7,469[8] K |
金属量 [Fe/H] | −0.02[10] dex |
自转速度 (v sin i) | 68[11] km/s |
年龄 | 893[9] Myr |
其他命名 | |
参考资料库 | |
SIMBAD | 资料 |
这个天体的恒星分类为A9IV[3],匹配远离主序带演化成为次巨星。这是一个低振幅的盾牌座δ型变星,范围从3.94到3.90星等,周期为0.05天[4]。这颗恒星的年龄为8亿9300万年[9],并且以68公里/秒的投影旋转速度旋转[11]。它的质量是1.9倍太阳质量[7],和半径3.3倍太阳半径[8]。这颗恒星来自光球辐射的光度是太阳光度的31倍,表面的有效温度为7,469K[8]。
参考资料
编辑- ^ 1.0 1.1 1.2 1.3 1.4 1.5 Van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664. Bibcode:2007A&A...474..653V. S2CID 18759600. arXiv:0708.1752 . doi:10.1051/0004-6361:20078357. Vizier catalog entry (页面存档备份,存于互联网档案馆)
- ^ 2.0 2.1 2.2 2.3 Ducati, J. R. VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system. CDS/ADC Collection of Electronic Catalogues. 2002, 2237. Bibcode:2002yCat.2237....0D.
- ^ 3.0 3.1 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample. The Astronomical Journal. 2006, 132: 161–170. Bibcode:2006AJ....132..161G. S2CID 119476992. arXiv:astro-ph/0603770 . doi:10.1086/504637.
- ^ 4.0 4.1 Samus, N. N.; Durlevich, O. V.; et al. VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013). VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 2009, 1. Bibcode:2009yCat....102025S.
- ^ 5.0 5.1 Wilson, R. E. General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. 1953. Bibcode:1953GCRV..C......0W. LCCN 54001336.
- ^ 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. Vizier catalog entry (页面存档备份,存于互联网档案馆)
- ^ 7.0 7.1 Allende Prieto, C.; Lambert, D. L. Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures. Astronomy and Astrophysics. 1999, 352: 555–562. Bibcode:1999A&A...352..555A. arXiv:astro-ph/9911002 . Vizier catalog entry (页面存档备份,存于互联网档案馆)
- ^ 8.0 8.1 8.2 8.3 8.4 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 . doi:10.1051/0004-6361/201833051. VizieR中此天体在盖亚望远镜第二批数据发布的记录
- ^ 9.0 9.1 9.2 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. Vizier catalog entry (页面存档备份,存于互联网档案馆)
- ^ Gontcharov, G. A. Dependence of kinematics on the age of stars in the solar neighborhood. Astronomy Letters. 2012, 38 (12): 771–782. Bibcode:2012AstL...38..771G. S2CID 118345778. arXiv:1606.08814 . doi:10.1134/S1063773712120031. Vizier catalog entry (页面存档备份,存于互联网档案馆)
- ^ 11.0 11.1 Hoffleit, D.; Warren, W. H. Bright Star Catalogue. VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H 5th Revised. 1995, 5050. Bibcode:1995yCat.5050....0H.
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值 (帮助). SIMBAD. 斯特拉斯堡天文资料中心. rho01 Sgr] - ^ Eggleton, P. P.; Tokovinin, A. A. A catalogue of multiplicity among bright stellar systems. Monthly Notices of the Royal Astronomical Society. September 2008, 389 (2): 869–879. Bibcode:2008MNRAS.389..869E. S2CID 14878976. arXiv:0806.2878 . doi:10.1111/j.1365-2966.2008.13596.x.
- ^ Edwards, D. A.; Evans, D. S.; Fekel, F. C.; Smith, B. W. Photoelectric observations of lunar occultations. XI.. Astronomical Journal. April 1980, 85: 478–489. Bibcode:1980AJ.....85..478E. doi:10.1086/112700.