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巨蛇座W

巨蛇座W(W Ser)

观测资料
历元 J2000.0 (ICRS)
星座 巨蛇座
星官
赤经 18h 09m 50.64994s[1]
赤纬 -15° 33′ 00.2809″[1]
视星等(V) 8.42-10.2[2]
特性
光谱分类F8/G2Iaep + AV[3][4]
变星类型W Ser[5]
天体测定
视差 (π)0.70 ± 0.99[1] mas
距离approx. 5,000 ly
(approx. 1,000 pc)
其他命名
BD−15° 4842、​HD 166126、​HIP 88994、​SAO 161128
参考数据库
SIMBAD资料

巨蛇座W是在巨蛇座的多星系统。这个系统的视星等以刚好超过14天的时间周期在8.42和10.2等之间变化[2],但因为光度太黯淡,以致肉眼看不见它们[6]。变化的主要原因是系统中有一对食双星(即一颗恒星从另一颗恒星前面经过,导致亮度发生变化)。然而,其周期的变化表明,一颗或两颗成员星在彼此相互作用时,亮度存在与生俱来的变化,而很难分离光来确定其性质[7]。周期每年增加14秒,表明有大量物质正在从较大但较暗的星转移到较小但较亮的星[4]

发现这个系统有吸积盘,是在巨蛇座中第一个发现的,这个食双星含有异常强烈的远紫外线谱线[7]。这个系统有从一颗星传移质量至另一颗星的高转移率,因而被认为会先演化成双周期变星,然后成为经典的大陵五型变星[8]。在质量转移的后期,此类系统可以发展出光学后的星周盘,而成为独立的巨蛇座W型变星 [5]。这个类型可能也代表不同类型的系统,相较于巨蛇座W型会是更年轻和有更大的质量[9]

伴星的光谱类型尚不清楚;较热且较亮的主星被归F型巨星。然而,它的物质似乎完全被遮蔽了;另一种理论认为它是一颗高温的主序星,因为它似乎太亮了,不应该是F类的恒星,而环绕在周围的物质提供了光谱。还没有检测到伴星(体积较大但较暗淡)的光谱。对偏光的检视显示,喷流的物质似乎来自主星[4]

参考资料

  1. ^ 1.0 1.1 1.2 Van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752可免费查阅. doi:10.1051/0004-6361:20078357. 
  2. ^ 2.0 2.1 VSX. W Serpentis. AAVSO Website. American Association of Variable Star Observers. 4 January 2010 [7 July 2014]. (原始内容存档于2018-06-12). 
  3. ^ Houk, N.; Smith-Moore, M. Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26°.0 to -12°.0. Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4. 1988. Bibcode:1988mcts.book.....H. 
  4. ^ 4.0 4.1 4.2 Piirola, V.; Berdyugin, A.; Mikkola, S.; Coyne, G. V. Polarimetric Study of the Massive Interacting Binary W Serpentis: Discovery of High-Latitude Scattering Spot/Jet. The Astrophysical Journal. 2005, 632 (1): 576–89. Bibcode:2005ApJ...632..576P. doi:10.1086/432902可免费查阅. 
  5. ^ 5.0 5.1 Wilson, R. E. The Relation of Algols and W Serpentis Stars. Algols. 1989: 191. ISBN 978-94-010-7587-9. doi:10.1007/978-94-009-2413-0_17. 
  6. ^ Bortle, John E. The Bortle Dark-Sky Scale. Sky & Telescope. Sky Publishing Corporation. February 2001 [10 July 2014]. (原始内容存档于2019-04-08). 
  7. ^ 7.0 7.1 Weiland, J. L.; Shore, S. N.; Beaver, E. A.; Lyons, R. W.; Rosenblatt, E. I. Goddard High-Resolution Spectrograph Observations of the Interacting Binary System W Serpentis. The Astrophysical Journal. 1995, 447: 401. Bibcode:1995ApJ...447..401W. doi:10.1086/175883. 
  8. ^ Mennickent, R. E.; Kolaczkowski, Z. Interacting Binary Star Environments and the W Ser - DPV - Algol Connection. 2009. arXiv:0904.1539可免费查阅 [astro-ph.SR]. 
  9. ^ Mennickent, R. E.; Kołaczkowski, Z. Interacting Binary Stars Environments and the W Ser-DPV-Algol Connection. The Interferometric View on Hot Stars (Eds. Th. Rivinius & M. Curé) Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) Vol. 38. 2010, 38: 23. Bibcode:2010RMxAC..38...23M. arXiv:0904.1539可免费查阅. 

进阶读物

https://www.eso.org/sci/publications/messenger/archive/no.39-mar85/messenger-no39-40-42.pdf页面存档备份,存于互联网档案馆

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巨蛇座W
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