南十字座θ2
觀測資料 曆元 J2000 | |
---|---|
星座 | 南十字座 |
星官 | |
赤經 | 12h 04m 19.21504s[1] |
赤緯 | −63° 09′ 56.5537″[2] |
視星等(V) | 4.718[3] |
特性 | |
光谱分类 | B3 V[4] |
U−B 色指数 | −0.61[5] |
B−V 色指数 | −0.08[5] |
变星类型 | 仙王座β |
天体测定 | |
徑向速度 (Rv) | +16.3[6] km/s |
自行 (μ) | 赤经:−17.63[2] mas/yr 赤纬:−0.01[2] mas/yr |
视差 (π) | 3.82 ± 0.32[2] mas |
距离 | 850 ± 70 ly (260 ± 20 pc) |
绝对星等 (MV) | −2.35[7] |
軌道[8] | |
繞行週期 (P) | 3.428 d |
偏心率 (e) | 0.00 |
近心点 曆元 (T) | 2419604.367 JD |
半振幅 (K1) (primary) | 51.3 km/s |
詳細資料 | |
亮度 | 809[9] L☉ |
溫度 | 9,598[9] K |
自轉速度 (v sin i) | 23[10] km/s |
其他命名 | |
參考資料庫 | |
SIMBAD | 资料 |
南十字座θ2,拉丁文是θ2 Crucis,是在南十字座的一對光譜聯星。它們的完整軌道週期是3.4280天,軌道離心率非常低,趨近於0.0[11]。南十字座θ2與太陽的距離約750光年[2]。
該系統組合的平均視星等為+4.72m。由於其中有一顆是仙王座β型變星,星等在+4.70m和+4.74m之間稍有變化,使得星等不能固定,這個變化的週期是0.0889天[12]。這個系統被歸類為藍白的B型主序星,恆星光譜為B3V[4]。
參考資料
- ^ van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752
, doi:10.1051/0004-6361:20078357.
- ^ 2.0 2.1 2.2 2.3 2.4 Perryman, M. A. C.; et al. The HIPPARCOS Catalogue. Astronomy & Astrophysics. April 1997, 323: L49–L52. Bibcode:1997A&A...323L..49P.
- ^ 3.0 3.1 V* tet02 Cru. SIMBAD. 斯特拉斯堡天文資料中心. [2010-05-19].
- ^ 4.0 4.1 Houk, N.; Cowley, A. P., University of Michigan Catalogue of two-dimensional spectral types for the HD stars 1, 1975, Bibcode:1975mcts.book.....H.
- ^ 5.0 5.1 Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. UBVRIJKL photometry of the bright stars. Communications of the Lunar and Planetary Laboratory. 1966, 4 (99). Bibcode:1966CoLPL...4...99J.
- ^ Wilson, Ralph Elmer. General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. 1953. Bibcode:1953GCRV..C......0W.
- ^ Anderson, E.; Francis, Ch., XHIP: An extended hipparcos compilation, Astronomy Letters, 2012, 38 (5): 331, Bibcode:2012AstL...38..331A, arXiv:1108.4971
, doi:10.1134/S1063773712050015.
- ^ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; et al, SB9: The ninth catalogue of spectroscopic binary orbits, Astronomy & Astrophysics, 2004, 424 (2): 727, Bibcode:2004A&A...424..727P, arXiv:astro-ph/0406573
, doi:10.1051/0004-6361:20041213.
- ^ 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, arXiv:1208.2037
, doi:10.1111/j.1365-2966.2012.21873.x.
- ^ Bernacca, P. L.; Perinotto, M. A catalogue of stellar rotational velocities. Contributi Osservatorio Astronomico di Padova in Asiago. 1970, 239 (1). Bibcode:1970CoAsi.239....1B.
- ^ Batten, A. H. Sixth catalogue of the orbital elements of spectroscopic binary systems. Publications of the Dominion Astrophysical Observatory, Victoria. 1967, 13: 154–155. Bibcode:1967PDAO...13..119B.
- ^ Samus, N. N.; Durlevich, O. V.; et al. General Catalogue of Variable Stars. VizieR. January 2009 [2010-05-19]. (原始内容存档于2013-04-23). Note: query for GCVS "tet 2 Cru".
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