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昴宿四

昴宿四(金牛座20)
Maia, 20 Tauri

昴宿四在昴宿星团的位置(右上方)
觀測資料
曆元 J2000
星座 金牛座
星官 昴宿
赤經 03h 45m 49.6067s[1]
赤緯 24° 22′ 03.895″[1]
視星等(V) 3.871[1]
特性
光谱分类B8III[1]
U−B 色指数-0.40
B−V 色指数-0.07[2]
变星类型疑似
天体测定
徑向速度 (Rv)7.5[1] km/s
自行 (μ) 赤经:21.09[1] mas/yr
赤纬:-45.03[1] mas/yr
视差 (π)7.97 ± 1.03[3] mas
距离approx. 410 ly
(approx. 130 pc)
绝对星等 (MV)-1.70
詳細資料
質量4.5-5[4] M
半徑6.34[4] R
亮度840[4] L
溫度12,400[4] K
金屬量1.10 Fe/H[5]
自轉33 km/s[6]
年齡?
其他命名
Maia, 20 Tauri, HR 1149, BD 23° 516, HD 23408, HIP 17573, SAO 76155, GC 4500, NSV 01279, WDS J03458+2422


參考資料庫
SIMBAD资料

昴宿四,即金牛座20(20 Tau,20 Tauri)是一颗位于金牛座恒星,距离地球约360光年

特征

昴宿四是一颗B8 II型的蓝色巨星视星等为+3.871,是昴宿星团第四亮的恒星,仅次于昴宿六昴宿七昴宿一。昴宿四是一颗汞-锰星,亮度是太阳亮度的840倍,质量是太阳质量的4.5-5倍。[4] 昴宿四位于昴宿星团的发射星云玛亚的星云(NGC 1432)中。[7]

天文学家奥托·斯特鲁维认为昴宿四是一颗变星,是玛亚变星(Maia variables )的代表星,北极一也属于这个类型的变星。但后续的观测发现被列入玛亚变星的恒星性质都很稳定,可能并非变星。[4]

命名

中国古代星官系统中,昴宿四属于西方白虎七宿昴宿昴星官第四星,这也是昴宿四名字的来由。[8][9] 它在西方被称为Maia,即迈亚,是希腊神话提坦神阿特拉斯和大洋神女普勒俄涅所生的七个女儿(七姐妹,普勒阿得斯)中的一个,赫耳墨斯的母亲。

参考资料

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 SIMBAD query result: MAIA -- Variable Star. Centre de Données astronomiques de Strasbourg. [2010-06-11]. (原始内容存档于2013-07-07). 
  2. ^ Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewski, W. Z. UBVRIJKL photometry of the bright stars.. Comm. Lunar Plan. Lab., 4 (PDF). 1966. Bibcode:1966CoLPL...4...99J. SIMBAD. 
  3. ^ Perryman, M. A. C.; et al, The Hipparcos Catalogue, Astronomy & Astrophysics, 1997, 323: L49–L52, Bibcode:1997A&A...323L..49P 
  4. ^ 4.0 4.1 4.2 4.3 4.4 4.5 Professor James B. (Jim) Kaler. MAIA (20 Tauri). University of Illinois. [2010-06-11]. (原始内容存档于2013-07-07). 
  5. ^ Heacox, W. D. Chemical abundances in Hg-Mn stars. Astrophysical Journal Supplement Series (PDF). 1979, 41: 675–688. Bibcode:1979ApJS...41..675H. doi:10.1086/190637. 
  6. ^ Royer, F.; Grenier, S.; Baylac, M.-O.; Gómez, A. E.; Zorec, J. Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i in the northern hemisphere. Astronomy and Astrophysics (PDF). 2002, 393 (3): 897–911. Bibcode:2002A&A...393..897R. arXiv:astro-ph/0205255可免费查阅. doi:10.1051/0004-6361:20020943. 
  7. ^ SEDS Students for the Exploration and Development of Space. NGC 1432. [2010-06-11]. (原始内容存档于2012-12-20). 
  8. ^ 香港太空館 - 研究資源 - 亮星中英對照表 互联网档案馆存檔,存档日期2010-08-11., Hong Kong Space Museum. Accessed on line November 23, 2010.
  9. ^ 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
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