HD 149989
HD 149989也称为天坛座V872,是在南天星座天坛座的一颗变星[3],位于该星座的西方与矩尺座的边界附近。天坛座V872是变星名称,而HD 149989是 亨利·德雷珀目录 中的标识符。这是一颗暗淡的恒星,接近肉眼可见的下限,其视星等在6.30左右波动[3]。根据视差的量测,它距离太阳167光年,并以46km/s的径向速度远离太阳[7]。
观测资料 历元 J2000.0 | |
---|---|
星座 | 天坛座 |
星官 | |
赤经 | 16h 40m 44.39899s[2] |
赤纬 | −51° 28′ 41.7258″[2] |
视星等(V) | 6.30[3] |
特性 | |
光谱分类 | A9 V[4] or F1 V nn m-4[5] |
B−V 色指数 | ±0.006 0.321[6] |
变星类型 | γ Dor[3] |
天体测定 | |
径向速度 (Rv) | ±0.5 45.9[7] km/s |
自行 (μ) | 赤经:+11.741[2] mas/yr 赤纬:+131.264[2] mas/yr |
视差 (π) | 19.5759 ± 0.0521[2] mas |
距离 | 166.6 ± 0.4 ly (51.1 ± 0.1 pc) |
绝对星等 (MV) | 2.83[6] |
详细资料 | |
质量 | 1.60[8] M☉ |
半径 | +0.08 −0.12 1.70[2] R☉ |
表面重力 (log g) | ±0.14 4.21[8] |
亮度 | ±0.02 6.27[2] L☉ |
温度 | +257 −159 7,003[2] K |
自转速度 (v sin i) | 136[9] km/s |
年龄 | 1.144[8] Gyr |
其他命名 | |
参考资料库 | |
SIMBAD | 资料 |
这颗恒星是一颗A型主序星,恒星分类为A9V[4],2016年对剑鱼座γ型这类恒星的调查发现了一类F1 V nn m-4,其中“nn”表示由于快速旋转而“模糊”谱线,“m-4”表示是一颗贫金属恒星,其金属线与A7类相匹配[5]。这是一颗已确认的变星,属于剑鱼座γ型的变星,周期为0.42658天[3]。它的年龄约为11亿年[8],并且以136公里/秒的投影旋转速度旋转[9]。
参考资料
- ^ Aerts, C.; Eyer, L.; Kestens, E. The discovery of new gamma Doradus stars from the HIPPARCOS mission. Astronomy & Astrophysics. September 1998, 337: 790–796 [26 October 2021]. Bibcode:1998A&A...337..790A. (原始内容存档于2023-05-19).
- ^ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 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
- ^ 3.0 3.1 3.2 3.3 3.4 De Cat, P.; et al, A spectroscopic study of southern (candidate) γ Doradus stars. I. Time series analysis, Astronomy and Astrophysics, April 2006, 449 (1): 281–292, Bibcode:2006A&A...449..281D, S2CID 119518208, arXiv:astro-ph/0511207 , doi:10.1051/0004-6361:20053655
- ^ 4.0 4.1 Houk, Nancy, Michigan catalogue of two-dimensional spectral types for the HD stars 2, Ann Arbor: Dept. of Astronomy, University of Michigan, 1978, Bibcode:1978mcts.book.....H.
- ^ 5.0 5.1 Kahraman Aliçavuș, F.; et al, Spectroscopic survey of γ Doradus stars - I. Comprehensive atmospheric parameters and abundance analysis of γ Doradus stars, Monthly Notices of the Royal Astronomical Society, May 2016, 458 (3): 2307–2322, Bibcode:2016MNRAS.458.2307K, S2CID 16477998, arXiv:1602.06514 , doi:10.1093/mnras/stw393.
- ^ 6.0 6.1 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.
- ^ 7.0 7.1 Gontcharov, G. A., Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system, Astronomy Letters, November 2006, 32 (11): 759–771, Bibcode:2006AstL...32..759G, S2CID 119231169, arXiv:1606.08053 , doi:10.1134/S1063773706110065.
- ^ 8.0 8.1 8.2 8.3 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.
- ^ 9.0 9.1 Royer, F.; et al, Rotational velocities of A-type stars. III. Velocity distributions, Astronomy and Astrophysics, February 2007, 463 (2): 671–682, Bibcode:2007A&A...463..671R, S2CID 18475298, arXiv:astro-ph/0610785 , doi:10.1051/0004-6361:20065224.
- ^ V872 Ara. SIMBAD. 斯特拉斯堡天文资料中心.