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市樓二

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市樓二（巨蛇座ο）
觀測資料
曆元 J2000.0
星座 巨蛇座
星官
赤經 17h 41m 24.87286s[1]
赤緯 -12° 52′ 31.1086″[1]
視星等（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
徑向速度 (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]
詳細資料
質量2.13[7] M☉
半徑2.2[8] R☉
表面重力 (log g)3.82±0.14[7]
亮度42.6[9] L☉
溫度8,972±305[7] K
自轉速度 (v sin i)112.6±1.2[10] km/s
年齡518[7] Myr
其他命名
ο Ser、56 Ser、 BD−12° 4808、FK5 3405、HD 160613、HIP 86565、HR 6581、SAO 160747[11]。
參考資料庫
SIMBAD资料

市樓二（ο Ser、ο Serpentis）是位於赤道星座巨蛇座尾段的一顆孤獨的恆星[12]。根據從地球上看到每年18.83mas的視差偏移[1]，它距離太陽約173光年。這顆恆星的視星等為肉眼可見的+4.26等[2]。

這是一顆白色的A型主序星，其恆星分類為A2 Va[3]。它位於不穩定帶的低處[6]，並且被分類為盾牌座δ型變星。這顆恆星的視星等在4.26〜4.27等之間變化，週期為76分鐘，即0.053天[6][13]。

估計這顆恆星的質量是太陽質量的2.13倍[7]，半徑是太陽半徑的2.2倍[8]。年齡大約5億年[7]，並且以112.6 km/s的預計轉速旋轉[10]。從光球在8,972K的有效溫度下[7]，市樓二輻射的光度是太陽光度的42.6倍[9]。

1909年，共生新星[14]巨蛇座RT儘管它只達到了10等最高星等，但它出現在市樓二附近[15]。

參考資料

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  1. ^ 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 可免费查阅, doi:10.1051/0004-6361:20078357. 
  2. ^ 2.0 2.1 2.2 2.3 Mermilliod, J.-C., Compilation of Eggen's UBV data, transformed to UBV (unpublished), Catalogue of Eggen's UBV Data (SIMBAD), 1986, Bibcode:1986EgUBV........0M. 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. ^ 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. 
  4. ^ 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. 
  5. ^ 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 可免费查阅, doi:10.1051/0004-6361/201219219, A61. 
  6. ^ 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. ^ 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 可免费查阅, doi:10.1088/0004-637X/804/2/146. 
  8. ^ 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 可免费查阅, doi:10.1051/0004-6361:20000451. 
  9. ^ 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 可免费查阅, doi:10.1111/j.1365-2966.2012.21873.x 可免费查阅. 
  10. ^ 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 可免费查阅, doi:10.1051/0004-6361/201016386. 
  11. ^ omi Ser. SIMBAD. 斯特拉斯堡天文資料中心. 
  12. ^ 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 可免费查阅, doi:10.1111/j.1365-2966.2008.13596.x 可免费查阅. 
  13. ^ 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 可免费查阅, doi:10.1088/0004-6256/145/5/132. 
  14. ^ 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. 
  15. ^ 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）. 
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