参旗八
（重定向自猎户座π5）
 | |
| 觀測資料 曆元 J2000.0 | |
|---|---|
| 星座 | 猎户座 |
| 星官 | |
| 赤經 | 04h 54m 15.09604s[1] |
| 赤緯 | +02° 26′ 26.4231″[1] |
| 視星等（V） | 3.69[2] |
| 特性 | |
| 光谱分类 | B2 III[3] |
| U−B 色指数 | −0.81[2] |
| B−V 色指数 | −0.18[2] |
| 变星类型 | 旋转椭球变星[4] |
| 天体测定 | |
| 徑向速度 (Rv) | +23.4[5] km/s |
| 自行 (μ) | 赤经：+0.55[1] mas/yr 赤纬：+0.61[1] mas/yr |
| 视差 (π) | 2.43 ± 0.39[1] mas |
| 距离 | approx. 1,300 ly (approx. 410 pc) |
| 軌道[6] | |
| 繞行週期 (P) | 3.7005 d |
| 偏心率 (e) | 0.0000 |
| 近心点 曆元 (T) | 2417921.64±0.01 JD |
| 半振幅 (K1) (primary) | 57.88±1.07 km/s |
| 詳細資料 | |
| π5 Ori A | |
| 質量 | 12.5±0.6[7] M☉ |
| 表面重力 (log g) | 3.51[8] |
| 亮度 | 11,262[9] L☉ |
| 溫度 | 14,496[9] K |
| 金属量 [Fe/H] | −0.28[8] dex |
| 自轉速度 (v sin i) | 90[10] km/s |
| 年齡 | 15.8±0.2[7] Myr |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 资料 |
参旗八（猎户座π5）是位于猎户座的双星系统，其视星等为3.69[2]。
参考文献
- ^ 1.0 1.1 1.2 1.3 1.4 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 Crawford, D. L.; et al, Four-color, H-beta, and UBV photometry for bright B-type stars in the northern hemisphere, The Astronomical Journal, 1971, 76: 1058, Bibcode:1971AJ.....76.1058C, doi:10.1086/111220.
- ^ Chini, R.; et al, A spectroscopic survey on the multiplicity of high-mass stars, Monthly Notices of the Royal Astronomical Society, 2012, 424 (3): 1925, Bibcode:2012MNRAS.424.1925C, arXiv:1205.5238 , doi:10.1111/j.1365-2966.2012.21317.x.
- ^ Morris, S. L., The ellipsoidal variable stars, Astrophysical Journal, Part 1, August 1985, 295: 143−152, Bibcode:1985ApJ...295..143M, doi:10.1086/163359.
- ^ Evans, D. S., The Revision of the General Catalogue of Radial Velocities, Batten, Alan Henry; Heard, John Frederick (编), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, June 20–24, 1966, Bibcode:1967IAUS...30...57E.
- ^ Pourbaix, D.; 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.
- ^ 7.0 7.1 Tetzlaff, N.; et al, A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun, Monthly Notices of the Royal Astronomical Society, January 2011, 410 (1): 190–200, Bibcode:2011MNRAS.410..190T, arXiv:1007.4883 , doi:10.1111/j.1365-2966.2010.17434.x.
- ^ 8.0 8.1 Soubiran, C.; et al, The PASTEL catalogue of stellar parameters, Astronomy and Astrophysics, June 2010, 515: A111, Bibcode:2010A&A...515A.111S, arXiv:1004.1069 , doi:10.1051/0004-6361/201014247.
- ^ 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.
- ^ Abt, Helmut A.; Boonyarak, Chayan, Tidal Effects in Binaries of Various Periods, The Astrophysical Journal, November 2004, 616 (1): 562−566, Bibcode:2004ApJ...616..562A, doi:10.1086/423795.
- ^ pi.05 Ori -- Spectroscopic binary, SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), [2016-11-18], （原始内容存档于2016-11-23）.
外部链接
- Kaler, James B., Pi-5 Orionis, Stars (University of Illinois), February 6, 2009 [2016-11-22], （原始内容存档于2012-06-19）.