史蒂文森2-18

史蒂芬森2-18

2MASS拍攝的史蒂芬森2-18與其母星團史蒂芬森2（左上）。
Credit: 斯特拉斯堡大學/CNRS (2003)
觀測資料
曆元 J2000
星座 盾牌座
星官
赤經 18h 39m 02.3709s[1]
赤緯 -06° 05′ 10.5357″[1]
視星等（V）
特性
演化阶段紅超巨星
光谱分类~M6[2]
视星等 (G)15.2631±0.0092[1]
视星等 (J)7.150[3]
视星等 (H)4.698[3]
视星等 (K)2.9[3]
天体测定
自行 (μ) 赤经：−3.045±0.511[1] mas/yr
赤纬：−5.950±0.480[1] mas/yr
视差 (π)−0.0081 ± 0.3120[1] mas
距离18,900[4] ly
(5,800[4] pc)
詳細資料
半徑2,150[5][a] R☉
亮度437,000[5] (90,000[6] – 630,000[4][b]) L☉
溫度3,200[5] K
其他命名
史蒂芬森2-18、史蒂芬森2DFK1、St 2-18、RSGC2-18、2MASS J18390238-0605106、IRAS 18363-0607
參考資料庫
SIMBAD资料


史蒂文森2-18（Stephenson 2-18）是位于盾牌座方向的一个紅特超巨星。距離地球大約20,000光年，在史蒂芬森2疏散星團視線方向。[7].

觀測數據

斯蒂芬森2-18与盾牌座UY特超巨星和大犬座VY超巨星的大小比較。

它是目前已知体积最大的恆星。其測量的半徑是我們的太陽半徑的2158倍 [5]. 估計有效溫度為3,200克爾文，光度為440,000 太陽光度。 [5].

參見

註釋

  1. ^ 假设恒星有效温度为5772开尔文条件下按斯特凡-波茲曼定律计算：
  2. ^ 有时会被误记为RSGC1-F01

參考文獻

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy & Astrophysics. 2018. Bibcode:2018A&A...616A...1G. arXiv:1804.09365 可免费查阅. doi:10.1051/0004-6361/201833051.  VizieR中此天体在盖亚望远镜第二批数据发布的记录
  2. ^ Negueruela, I.; González-Fernández, C.; Dorda, R.; Marco, A.; Clark, J. S. The population of M-type supergiants in the starburst cluster Stephenson 2. Eas Publications Series. 2013, 60: 279. Bibcode:2013EAS....60..279N. arXiv:1303.1837 可免费查阅. doi:10.1051/eas/1360032. 
  3. ^ 3.0 3.1 3.2 Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003). VizieR On-line Data Catalog: II/246. Originally Published in: 2003yCat.2246....0C. 2003, 2246: 0. Bibcode:2003yCat.2246....0C. 
  4. ^ 4.0 4.1 4.2 Humphreys, Roberta M.; Helmel, Greta; Jones, Terry J.; Gordon, Michael S. Exploring the Mass Loss Histories of the Red Supergiants. The Astronomical Journal. 2020, 160 (3): 145. Bibcode:2020AJ....160..145H. arXiv:2008.01108 可免费查阅. doi:10.3847/1538-3881/abab15. 
  5. ^ 5.0 5.1 5.2 5.3 5.4 Fok, Thomas K. T; Nakashima, Jun-ichi; Yung, Bosco H. K; Hsia, Chih-Hao; Deguchi, Shuji. Maser Observations of Westerlund 1 and Comprehensive Considerations on Maser Properties of Red Supergiants Associated with Massive Clusters. The Astrophysical Journal. 2012, 760 (1): 65. Bibcode:2012ApJ...760...65F. arXiv:1209.6427 可免费查阅. doi:10.1088/0004-637X/760/1/65. 
  6. ^ Deguchi, Shuji; Nakashima, Jun-Ichi; Zhang, Yong; Chong, Selina S. N.; Koike, Kazutaka; Kwok, Sun. SiO and H2O Maser Observations of Red Supergiants in Star Clusters Embedded in the Galactic Disk. Publications of the Astronomical Society of Japan. 2010, 62 (2): 391–407. Bibcode:2010PASJ...62..391D. arXiv:1002.2492 可免费查阅. doi:10.1093/pasj/62.2.391. 
  7. ^ Davies, B.; Figer, D. F.; Kudritzki, R. P.; MacKenty, J.; Najarro, F.; Herrero, A. A Massive Cluster of Red Supergiants at the Base of the Scutum‐Crux Arm. The Astrophysical Journal. 2007, 671 (1): 781–801. Bibcode:2007ApJ...671..781D. arXiv:0708.0821 可免费查阅. doi:10.1086/522224. 

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