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仙后座V509

仙后座V509

仙后座V509
觀測資料
曆元 J2000.0
星座 仙后座
星官
赤經 23h00m05.1s
赤緯 +56°56′43″
視星等(V) +4.6 - +5.2[1]
特性
光谱分类G0Ia0[1]
U−B 色指数+1.16
B−V 色指数+1.0 - +1.7[1]
变星类型半規則
天体测定
徑向速度 (Rv)−58 km/s
自行 (μ) 赤经:−2.94 mas/yr
赤纬:−3.09 mas/yr
视差 (π)0.73 ± 0.25 mas
距离4,500[1] ly
(1,370[1] pc)
绝对星等 (MV)−8.6 (變動的)[1]
詳細資料
質量11 (減少中)[1] M
半徑400 -900[1] R
亮度200.000 - 400,000[1] L
溫度4,000-8,000 (增加中)[1] K
金屬量?
自轉?
年齡?
其他命名
HR 8752, HD 217476, FK5 3839, HIP 113561, SAO 35039
參考資料庫
SIMBAD资料

仙后座 V509 (= V509 Cas = HR 8752)是在仙后座的一顆恆星。

仙后座V509是一顆G-型黃超巨星,現在的視星等是+5.2附近,在歷史上不同的時代則在+6等以下,但曾多次達到+4.3等的峰值。它與地球的距離約為4,500光年,在分類上屬於半規則變星,並且質量正在大量的流失中。它最近已演化成為黃色星,而在這50年中它至少流失了一個太陽的質量[1]

這一類型的恆星從起初的25-40太陽質量演化成為紅超巨星,現在正以戲劇化的爆炸一層層的脫落它剩餘的外殼,並且溫度在逐漸增加中。在光度下降成為晚期的沃夫-瑞葉星之前,它將經歷藍超巨星或是高光度藍變星的階段,但也可能在到達該點之前就發生超新星爆炸。

參考資料

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  1. ^ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 H. Nieuwenhuijzen, C. De Jager, I. Kolka, G. Israelian, A. Lobel, E. Zsoldos, A. Maeder, G. Meynet. The hypergiant HR 8752 evolving through the yellow evolutionary void. Astronomy & Astrophysics. 2012-10-01, 546 [2018-04-02]. ISSN 0004-6361. doi:10.1051/0004-6361/201117166 (英语). 

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仙后座V509
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