南十字座θ1

**南十字座θ¹**
觀測資料; 曆元 J2000.0 (ICRS)
星座	南十字座θ
星官
赤經	12h 03m 01.50130s
赤緯	−63° 18′ 46.5406″
視星等（V）	4.30
特性
光谱分类	A3(m)A8-A8
U−B 色指数	+0.03
B−V 色指数	+0.28
天体测定
徑向速度 (Rv)	−2.4 km/s
自行 (μ)	赤经：−152.35 mas/yr ; 赤纬：+7.00 mas/yr
视差 (π)	13.88 ± 0.15 mas
距离	235 ± 3 ly ; (72.0 ± 0.8 pc)
绝对星等 (MV)	+1.29
	軌道
繞行週期 (P)	24.4828 d
偏心率 (e)	0.61
近心点曆元 (T)	2419453.3470 JD
近心點幅角 (ω); (secondary)	358.9°
半振幅 (K1); (primary)	46.1 km/s
半振幅 (K2); (secondary)	56.1 km/s
詳細資料
質量	1.57 M☉
表面重力 (log g)	3.76
亮度	81 L☉
溫度	7341±250 K
年齡	1.1 Gyr
其他命名
	θ1 Cru, CPD−62° 2543, HD 104671, HIP 58758, HR 4599, SAO 251705.
參考資料庫
SIMBAD	资料

南十字座θ¹（θ¹Cru、θ¹ Crucis）是在南十字座的一對光譜聯星。它們的視星等是肉眼可見的+4.30^m^[2]。使用視差測量^[1]得到與太陽的距離大約是235光年。

這一對的軌道互相接近的週期是24.5天，離心率0.61^[6]。主星的光譜是Am星，是化學性質異常的A型恆星，顯示有某些元素的吸收線異常變化^[10]。它的恆星光譜是A3(m)A8-A8^[3]，質量是太陽的157%^[7]，它的外層大氣表面有效溫度是7341K^[7]，輻射出的光度是太陽的81倍^[8]。異常的是檢測到的X射線輻射來自這顆A型星的整個輻射層，但也有可能來自於軌道上的同伴^[11]。

參考資料

^ ^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, 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^ ^2.0 ^2.1 ^2.2 ^2.3 Mermilliod, J.-C., Compilation of Eggen's UBV data, transformed to UBV (unpublished), SIMBAD, 1986, Bibcode:1986EgUBV........0M.
^ ^3.0 ^3.1 Houk, N.; Cowley, A. P., University of Michigan Catalogue of two-dimensional spectral types for the HD stars 1, 1975, Bibcode:1975mcts.book.....H.
^ Wilson, Ralph Elmer, General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, 1953, Bibcode:1953GCRV..C......0W.
^ Eggen, Olin J., The Age Range of Hyades Stars, The Astronomical Journal, July 1998, 116 (1): 284–292, Bibcode:1998AJ....116..284E, doi:10.1086/300413.
^ ^6.0 ^6.1 Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; et al, S_B⁹: 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.
^ ^7.0 ^7.1 ^7.2 ^7.3 ^7.4 ^7.5 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, arXiv:1501.03154 , doi:10.1088/0004-637X/804/2/146.
^ ^8.0 ^8.1 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.
^ tet01 Cru. SIMBAD. 斯特拉斯堡天文資料中心. [2016-10-06].
^ Renson, P.; Manfroid, J., Catalogue of Ap, HgMn and Am stars, Astronomy and Astrophysics, May 2009, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788.
^ Schröder, C.; Schmitt, J. H. M. M., X-ray emission from A-type stars, Astronomy and Astrophysics, November 2007, 475 (2): 677–684, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429.

[vanLeeuwen2007-1] 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, arXiv:0708.1752 , doi:10.1051/0004-6361:20078357.

[Mermilliod1986-2] 2.0 ^2.1 ^2.2 ^2.3 Mermilliod, J.-C., Compilation of Eggen's UBV data, transformed to UBV (unpublished), SIMBAD, 1986, Bibcode:1986EgUBV........0M.

[Houk1975-3] 3.0 ^3.1 Houk, N.; Cowley, A. P., University of Michigan Catalogue of two-dimensional spectral types for the HD stars 1, 1975, Bibcode:1975mcts.book.....H.

[gcsrv-4] Wilson, Ralph Elmer, General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, 1953, Bibcode:1953GCRV..C......0W.

[Eggen1998-5] Eggen, Olin J., The Age Range of Hyades Stars, The Astronomical Journal, July 1998, 116 (1): 284–292, Bibcode:1998AJ....116..284E, doi:10.1086/300413.

[Pourbaix2004-6] 6.0 ^6.1 Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; et al, S_B⁹: 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.

[David2015-7] 7.0 ^7.1 ^7.2 ^7.3 ^7.4 ^7.5 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, arXiv:1501.03154 , doi:10.1088/0004-637X/804/2/146.

[Mcdonald2012-8] 8.0 ^8.1 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.

[SIMBAD-9] tet01 Cru. SIMBAD. 斯特拉斯堡天文資料中心. [2016-10-06].

[Renson2009-10] Renson, P.; Manfroid, J., Catalogue of Ap, HgMn and Am stars, Astronomy and Astrophysics, May 2009, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788.

[Schroeder2007-11] Schröder, C.; Schmitt, J. H. M. M., X-ray emission from A-type stars, Astronomy and Astrophysics, November 2007, 475 (2): 677–684, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429.

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

南十字座θ1

參考資料

Portal di Ensiklopedia Dunia