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Sher 25

Sher 25

哈伯太空望远镜拍摄NGC 3603影像。Sher 25是相对于影像中星团中心一点钟方向的最明亮恒星,两者之间有两区云气,并有一微弱的环状结构环绕。
观测资料
历元 J2000.0
星座 船底座
星官
赤经 11h 15m 7.649s[1]
赤纬 -61° 15′ 17.59″[1]
视星等(V) 12.23[1]
特性
光谱分类B1Iab[1]
U−B 色指数0.13[2]
B−V 色指数1.42[2]
变星类型cLBV[3]
天体测定
距离25,000[1] ly
(7,600[1] pc)
绝对星等 (MV)-7.8[1]
详细资料
质量40 ± 5[4] M
半径54[1] R
表面重力 (log g)2.6[4]
亮度 (bolometric)608,000[1] L
温度22,000[1][4] K
自转速度 (v sin i)65[3] km/s
年龄4[1] Myr
其他命名
Sher 25, NGC 3603-25, NGC 3603 MTT 13, NGC 3603 MDS 5
参考数据库
SIMBAD资料

Sher 25是一个距离地球约25000光年的蓝超巨星,该恒星在银河中位于属于电离氢区NGC 3603,在天球上位于船底座[5]。该恒星的光谱型为B1Iab,视星等12.2[6]

概要

Sher 25最初为主序星时的质量估计为太阳的60倍,但这类型恒星通常已经失去相当一部分的质量。目前仍不清楚Sher 25是否由红超巨星演化而成,或者从主序星阶段演化而来,因此它的质量仍无法确认[4]

该恒星的名称最初来自David Sher对NGC 3603内部恒星的编号目录。对于该恒星更准确的称呼应该是NGC 3603的Sher 25,以区分David Sher在其他星团中的恒星编号。Melnick、Tapia和Terlevich在NGC 3603中将该恒星编号为13号(即NGC 3603 MTT 13)[2]另外,Moffat、Drissen和Shara 使用哈伯太空望远镜巡天观测将该行星编号为5号(即NGC 3603 MDS 5)[7]

天文学家推测Sher 25已经是即将成为超新星的状态,并且该恒星抛出物质的模式类似大麦哲伦星系中的SN 1987A,有拱环和从两极外流的丝状结构[3]

Sher 25谱线中以数日为周期的多普勒效应规律变化有部分天文学家认为是暗示伴星的存在,但也有天文学家认为更可能的原因是恒星本身的脉动[8]

参考资料

  1. ^ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 Melena, N. W.; Massey, P.; Morrell, N. I.; Zangari, A. M. The Massive Star Content of Ngc 3603. The Astronomical Journal. 2008, 135 (3): 878. Bibcode:2008AJ....135..878M. arXiv:0712.2621可免费查阅. doi:10.1088/0004-6256/135/3/878. 
  2. ^ 2.0 2.1 2.2 Melnick, J.; Tapia, M.; Terlevich, R. The galactic giant H II region NGC 3603. Astronomy and Astrophysics. 1989, 213: 89. Bibcode:1989A&A...213...89M. 
  3. ^ 3.0 3.1 3.2 Smartt, S. J.; Lennon, D. J.; Kudritzki, R. P.; Rosales, F.; Ryans, R. S. I.; Wright, N. The evolutionary status of Sher 25 - implications for blue supergiants and the progenitor of SN 1987A. Astronomy and Astrophysics. 2002, 391 (3): 979. Bibcode:2002A&A...391..979S. arXiv:astro-ph/0205242可免费查阅. doi:10.1051/0004-6361:20020829. 
  4. ^ 4.0 4.1 4.2 4.3 Hendry, M. A.; Smartt, S. J.; Skillman, E. D.; Evans, C. J.; Trundle, C.; Lennon, D. J.; Crowther, P. A.; Hunter, I. The blue supergiant Sher 25 and its intriguing hourglass nebula. Monthly Notices of the Royal Astronomical Society. 2008, 388 (3): 1127. Bibcode:2008MNRAS.388.1127H. arXiv:0803.4262可免费查阅. doi:10.1111/j.1365-2966.2008.13347.x. 
  5. ^ Sher, D. Distances of Five Open Cluster Near Eta Carinae. Monthly Notices of the Royal Astronomical Society. 1965, 129 (3): 237–262. Bibcode:1965MNRAS.129..237S. ISSN 0035-8711. doi:10.1093/mnras/129.3.237. 
  6. ^ Brandner, Wolfgang; Grebel, Eva K.; Chu, You-Hua; Weis, Kerstin. Ring Nebula and Bipolar Outflows Associated with the B1.5 Supergiant Sher 25 in NGC 3603. Astrophysical Journal Letters. January 1997, 475: L45. Bibcode:1997ApJ...475L..45B. arXiv:astro-ph/9611046可免费查阅. doi:10.1086/310460. 
  7. ^ Moffat, A. F. J.; Drissen, L.; Shara, M. M. NGC 3603 and its Wolf-Rayet stars: Galactic clone of R136 at the core of 30 Doradus, but without the massive surrounding cluster halo. The Astrophysical Journal. 1994, 436: 183. Bibcode:1994ApJ...436..183M. doi:10.1086/174891. 
  8. ^ Taylor, W. D.; Evans, C. J.; Simon-Diaz, S.; Sana, H.; Langer, N.; Smith, N.; Smartt, S. J. Sher 25: pulsating but apparently alone. Monthly Notices of the Royal Astronomical Society. 2014, 442 (2): 1483–1490. Bibcode:2014MNRAS.442.1483T. ISSN 0035-8711. arXiv:1405.2101可免费查阅. doi:10.1093/mnras/stu925. 

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Sher 25
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