汞-錳星

汞-錳星光譜中因為游離的吸收而明顯的有波長為398.4奈米吸收線的化學異常星[1],這些恆星的光譜類型為B8或B9,並有下列二種特徵:

它們的自轉是相對緩慢的,結果是它們的大氣層也是相對的寧靜。有些原子會因為重力的力量而沉降,而其他的則因為輻射壓力而被抬升至恆星的表面,造成大氣層的不均勻。

下表是這個類型中最明亮的一些恆星:

名稱[2]拜耳佛氏名稱光譜類型[2]視星等[2]
壁宿二仙女座αB8IVmnp2.06
軫宿一烏鴉座γB8III2.59
昴宿四金牛座20B8III3.87
從官二豺狼座χB9IV3.96
天狼增四[3]大犬座γB8II4.10
女床一武仙座φB9mnp4.23
左攝提二牧夫座π1B9p4.91
貫索八北冕座ιA0p4.98
柳宿增二巨蟹座κAB8IIImnp5.24
牛宿一[4]摩羯座βB9.5III/IV6.10

參考資料

  1. Mercury-manganese star 页面存档备份,存于The Internet Encyclopedia of Science, David Darling. Accessed on line August 14,2008.
  2. Names, spectral types and apparent magnitudes taken from SIMBAD,except as noted.
  3. Muliphein 存檔,存档日期2008-05-17.Stars, Jim Kaler. Accessed on line August 14,2008.
  4. Dabih 存檔,存档日期2006-08-24.Stars, Jim Kaler. Accessed on line August 14,2008.
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