市楼二
| 观测资料 历元 J2000.0 | |
|---|---|
| 星座 | 巨蛇座 |
| 星官 | |
| 赤经 | 17h 41m 24.87286s[1] |
| 赤纬 | -12° 52′ 31.1086″[1] |
| 视星等（V） | 4.26[2] |
| 特性 | |
| 光谱分类 | A2 Va[3] |
| U−B 色指数 | +0.08[2] |
| B−V 色指数 | +0.07[2] |
| 变星类型 | 盾牌座δ型[4] |
| 天体测定 | |
| 径向速度 (Rv) | −30.2±1.2[5] km/s |
| 自行 (μ) | 赤经：−72.90[1] mas/yr 赤纬：−55.55[1] mas/yr |
| 视差 (π) | 18.83 ± 0.25[1] mas |
| 距离 | 173 ± 2 ly (53.1 ± 0.7 pc) |
| 绝对星等 (MV) | +0.760[6] |
| 详细资料 | |
| 质量 | 2.13[7] M☉ |
| 半径 | 2.2[8] R☉ |
| 表面重力 (log g) | 3.82±0.14[7] |
| 亮度 | 42.6[9] L☉ |
| 温度 | 8,972±305[7] K |
| 自转速度 (v sin i) | 112.6±1.2[10] km/s |
| 年龄 | 518[7] Myr |
| 其他命名 | |
| 参考数据库 | |
| SIMBAD | 资料 |
市楼二（ο Ser、ο Serpentis）是位于赤道星座巨蛇座尾段的一颗孤独的恒星[12]。根据从地球上看到每年18.83mas的视差偏移[1]，它距离太阳约173光年。这颗恒星的视星等为肉眼可见的+4.26等[2]。
这是一颗白色的A型主序星，其恒星分类为A2 Va[3]。它位于不稳定带的低处[6]，并且被分类为盾牌座δ型变星。这颗恒星的视星等在4.26〜4.27等之间变化，周期为76分钟，即0.053天[6][13]。
估计这颗恒星的质量是太阳质量的2.13倍[7]，半径是太阳半径的2.2倍[8]。年龄大约5亿年[7]，并且以112.6 km/s的预计转速旋转[10]。从光球在8,972K的有效温度下[7]，市楼二辐射的光度是太阳光度的42.6倍[9]。
1909年，共生新星[14]巨蛇座RT尽管它只达到了10等最高星等，但它出现在市楼二附近[15]。
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.
- ^ 2.0 2.1 2.2 2.3 Mermilliod, J.-C., Compilation of Eggen's UBV data, transformed to UBV (unpublished), Catalogue of Eggen's UBV Data (SIMBAD), 1986, Bibcode:1986EgUBV........0M.
- ^ 3.0 3.1 Houk, N., Michigan catalogue of two-dimensional spectral types for the HD stars 4, Ann Arbor: Dept. of Astronomy, University of Michigan, 1988, Bibcode:1988mcts.book.....H.
- ^ Samus, N. N.; Durlevich, O. V.; et al, 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.
- ^ de Bruijne, J. H. J.; Eilers, A.-C., Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project, Astronomy & Astrophysics, October 2012, 546: 14, Bibcode:2012A&A...546A..61D, S2CID 59451347, arXiv:1208.3048 , doi:10.1051/0004-6361/201219219, A61.
- ^ 6.0 6.1 6.2 Garcia, J. R.; et al, A catalogue of variable stars in the lower instability strip, Astronomy and Astrophysics Supplement, February 1995, 109: 201–262, Bibcode:1995A&AS..109..201G.
- ^ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 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.
- ^ 8.0 8.1 Pasinetti Fracassini, L. E.; et al, Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS), Astronomy and Astrophysics 3rd, February 2001, 367 (2): 521–524, Bibcode:2001A&A...367..521P, S2CID 425754, arXiv:astro-ph/0012289 , doi:10.1051/0004-6361:20000451.
- ^ 9.0 9.1 McDonald, I.; et al, Fundamental Parameters and Infrared Excesses of Hipparcos Stars, Monthly Notices of the Royal Astronomical Society, 2012, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, S2CID 118665352, arXiv:1208.2037 , doi:10.1111/j.1365-2966.2012.21873.x .
- ^ 10.0 10.1 Díaz, C. G.; et al, Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum, Astronomy & Astrophysics, July 2011, 531: A143, Bibcode:2011A&A...531A.143D, S2CID 119286673, arXiv:1012.4858 , doi:10.1051/0004-6361/201016386.
- ^ omi Ser. SIMBAD. 斯特拉斯堡天文资料中心.
- ^ 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 .
- ^ Chang, S.-W.; et al, Statistical Properties of Galactic δ Scuti Stars: Revisited, The Astronomical Journal, 2013, 145 (5): 132, Bibcode:2013AJ....145..132C, S2CID 118900730, arXiv:1303.1031 , doi:10.1088/0004-6256/145/5/132.
- ^ Pavlenko, E. P.; Bochkov, V. V.; Vasil'yanovskaya, O. P. 9,6-Year periodicity of symbiotic nova RT Ser (1909) during the outburst decay from 1940 to 1994. Astrophysics. 1996, 39 (1): 15–19. Bibcode:1996Ap.....39...15P. S2CID 120532937. doi:10.1007/BF02044949.
- ^ VSX; Osborne, W. RT Serpentis. AAVSO Website. American Association of Variable Star Observers. 1 April 2014 [28 May 2014]. （原始内容存档于2021-09-10）.
