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觜宿一

猎户座λ
觜宿一在猎户座的位置。
观测资料
历元 J2000.0
星座 猎户座[1][2]
星官 觜宿
赤经 5h 35m 8.3s[1][2]
赤纬 +9° 56′ 3″[1][2]
视星等(V) 3.54[1][2]
特性
光谱分类O8III((f))[1][2]
U−B 色指数-1.03[1][2]
B−V 色指数-0.18[1][2]
R−I 色指数-0.17[1][2]
天体测定
径向速度 (Rv)-1.03 km/s
自行 (μ) 赤经:34 mas/yr
赤纬:- mas/yr
视差 (π)0.007 mas
距离465937.68571429 ly
(142857.14285714 pc)
其他命名
BD+09 879,SAO 112921,HD 36861,HR 1879
参考数据库
SIMBAD资料

宿xiùMeissa/ˈmsə/)是在猎户座的一颗恒星,但它其实是多星系统。它与地球的距离大约是1,100 ly,整体合成的视星等为3.33。主要的成员是一颗O8型的巨星和一颗B型的主序星,彼此相距仅4角秒

命名

性质

觜宿一的主是一颗巨星光谱类型为O8III,视星等3.54等。它是一颗巨大的恒星,质量大约是太阳的28倍[3],半径是太阳的10倍[4]外围大气层有效温度大约是35,000K[4],赋予它发出蓝色光的O型星特征[5]。觜宿一是一个软X射线源,亮度为1032 erg s−1,辐射的峰值范围在0.2±0.3KeV,显示X射线可能是由恒星风产生的[6]

觜宿一是一对联星,与伴星分离的角距离为4.41角秒位置角43.12度(在1937年)[7]。伴星比主星黯淡,视星等为5.61等,光谱类型为B0.5V,是一颗B型主序星。外围还有另一颗伴星,它是一颗F型主序星,光谱类型为F8V。这颗恒星自己可能还有一颗质量非常低的伴侣,可能是一颗棕矮星 [6]

WISE红外线拍摄环绕在觜宿一周围的环。觜宿一是中心明亮的红色星云北方黯淡的白色恒星。左下角的亮星是参宿四。
(NASA/JPL-Caltech/UCLA)

环绕着觜宿一的星云环直径约12度。它被认为是超新星爆炸的残骸,现在被来自觜宿一本身和周围一些高温恒星的紫外线辐射电离[8]

星协

觜宿一是500万年前的一个恒星形成区域的主要成员,该区域被称为猎户座λ星协[9],或科林德69。它辐射出的强烈紫外线能量创造了Sh2-264 [10],形成环绕在它周围空间的氢离子区,或是说它被一个年龄约200万年至600万年,已经冷却的气体环包围着。这个膨胀的气体环被解释为可能是觜宿一之前的伴侣,成为II型超新星后喷出的残骸。这样的事件也可以解释在膨胀环中心恒星的本动速度,因为爆炸和因此造成的质量速度可能把觜宿一踢出系统。超新星残骸的候选者是中子星杰敏卡[11]。但是,鉴于杰敏卡和星协之间的距离,最后被认为不太可能.[12]

参考资料

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Pulsating variable Star. SIMBAD. Centre de Données astronomiques de Strasbourg. [2012-07-13]. (原始内容存档于2019-06-11). 
  2. ^ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 VizieR Detailed Page. [2012-07-13]. (原始内容存档于2016-03-05). 
  3. ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M., 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, S2CID 118629873, arXiv:1007.4883可免费查阅, doi:10.1111/j.1365-2966.2010.17434.x 
  4. ^ 4.0 4.1 Underhill, A. B.; et al, Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars, Monthly Notices of the Royal Astronomical Society, November 1979, 189 (3): 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601可免费查阅 
  5. ^ The Colour of Stars, Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004 [2012-01-16], (原始内容存档于2012-03-10) 
  6. ^ 6.0 6.1 Franciosini, E.; Sacco, G. G., XMM-Newton observations of the young open cluster around λ Orionis, Astronomy & Astrophysics, June 2011, 530: A150, Bibcode:2011A&A...530A.150F, S2CID 118633609, arXiv:1104.3803可免费查阅, doi:10.1051/0004-6361/201015248 
  7. ^ Scardia, M., Micrometric measurements of binary stars (first list), Astronomy and Astrophysics Supplement Series, September 1983, 53: 433–440, Bibcode:1983A&AS...53..433S (法语) 
  8. ^ Koenig, Xavier; Hillenbrand, Lynne A.; Padgett, Deborah L.; Defelippis, Daniel. SPECTROSCOPIC ASSESSMENT OFWISE-BASED YOUNG STELLAR OBJECT SELECTION NEARλANDσORIONIS. The Astronomical Journal. 2015, 150 (4): 100. Bibcode:2015AJ....150..100K. S2CID 20902398. arXiv:1506.05141可免费查阅. doi:10.1088/0004-6256/150/4/100. 
  9. ^ Bouy, H.; et al, A deep look into the core of young clusters. II. λ-Orionis, Astronomy and Astrophysics, September 2009, 504 (1): 199–209, Bibcode:2009A&A...504..199B, S2CID 1595852, arXiv:0907.0322可免费查阅, doi:10.1051/0004-6361/200912569 
  10. ^ Barrado Y Navascués, D. Hidalgo-Gámez, A. M.; González, J. J.; Espinosa, J. M. Rodríguez; Torres-Peimbert, S. , 编. II International GTC Workshop: Science with GTC 1st-light Instruments and the LMT. Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) 24. December 2005: 217–218. Bibcode:2005RMxAC..24..217B.  |contribution=被忽略 (帮助)
  11. ^ Cunha, K.; Smith, V. V., Is the expanding molecular cloud surrounding λ Orionis caused by a Supernova?, Astronomy and Astrophysics, May 1996, 309: 892–894, Bibcode:1996A&A...309..892C 
  12. ^ Pellizza, L. J.; et al, On the local birth place of Geminga, Astronomy and Astrophysics, May 2005, 435 (2): 625–630, Bibcode:2005A&A...435..625P, S2CID 15223974, arXiv:astro-ph/0502190可免费查阅, doi:10.1051/0004-6361:20042377 

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觜宿一
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