天鵝座OB2#12

天鵝座OB2#12
Cygnus OB2 #12

在附近假設存在的行星觀察天鵝座OB2#12的想像圖
觀測資料
曆元 J2000
星座 天鵝座
星官
赤經 20h 32m 40.9589s
赤緯 +41° 14' 29.286"
視星等(V)
特性
光谱分类B3-B5Iae
视星等 (B)14.41
视星等 (V)11.40
视星等 (J)4.667±0.324
视星等 (H)3.512±0.260
视星等 (K)2.704±0.364
B−V 色指数3.0
天体测定
自行 (μ) 赤经:1.91 mas/yr
赤纬:-2.47 mas/yr
视差 (π)-0.60 ± 2.07 mas
距离approx. −10,000 ly
(approx. −2,000 pc)
绝对星等 (MV)-12.2
詳細資料
質量92-120[1] M
半徑246[1] R
亮度1,950,000[1][2] L
溫度13,700[1] K
年齡3.0x106[1]
其他命名
VI CYG 12, 2MASS J20324096+4114291, NSV 13138, HIP 101364.
參考資料庫
SIMBAD资料

天鵝座OB2#12Cygnus OB2 #12)是一個光度極高的藍色特超巨星,其絕對熱星等(計算所有電磁輻射能量的絕對星等)為-12.2,已到達了正常恆星可能的光度上限。部分學者認為它可能是高光度藍變星

刚发现时认为該恆星的光度是太陽的6百萬倍,但是2012的新观测确认其光度大约是190万倍太阳光度,是銀河系中光度最高的恆星之一。这个恒星光谱型为B3Ia0,与著名的手枪星十分类似,该星相比手枪星稍小但是温度更高,质量则与手枪星相仿,大约是90-120个太阳质量。

天鵝座OB2#12是天鵝座OB2星團的成員星,這個位在天鵝座的星團距離地球約5000光年,是許多年輕高質量恆星聚集的星團,但該星團是位在銀河系中有大量星際塵埃的區域,因此發出的可見光被大量吸收,難以從地球觀察。这个恒星有一个伴星,亮度为主星的10%。

如果該恆星的可見光未被星際塵埃大量消光,其視星等將會是接近天鵝座主星天津四的1.5等,但因為大量星際塵埃緣故,其視星等是11.4等,需要以雙筒望遠鏡或小型天文望遠鏡觀測。

天鵝座OB2#12是高光度藍變星的候選者。依照它的光度和光譜類型,它在赫羅圖上高光度藍變星的位置。但至今尚未觀測到它的亮度變化,雖然自發現它開始已經發現它的光譜有變化。

參考資料

  1. ^ 1.0 1.1 1.2 1.3 1.4 Clark, J. S.; Najarro, F.; Negueruela, I.; Ritchie, B. W.; Urbaneja, M. A.; Howarth, I. D. On the nature of the galactic early-B hypergiants. Astronomy & Astrophysics. May 2012. 
  2. ^ De Jager, C. The yellow hypergiants. Astronomy and Astrophysics Review. 1998. 

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參考資料

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