ケフェウス座ニュー星

ケフェウス座ニュー星
Nu Cephei
星座 ケフェウス座
見かけの等級 (mv) 4.289[1] (4.25 - 4.35[2])
変光星型 Alpha Cygni[2]
分類 A2Iab[1]
位置
元期:J2000.0
赤経 (RA, α)  21h 45m 26.925s[3]
赤緯 (Dec, δ) +61° 07′ 14.90″[3]
視線速度 (Rv) -25.90[4]
固有運動 (μ) 赤経:-3.74 ± 0.13[3]
赤緯:-2.10 ± 0.12[3]
年周視差 (π) 0.48 ± 0.14ミリ秒[3]
（誤差29.2%）
絶対等級 (MV) -6.8[注 1]
物理的性質
自転周期 15[1]
色指数 (B-V) +0.518[1]
色指数 (U-B) +0.119[1]
年齢 8[5]
他のカタログでの名称
10 Cephei, HD 207260, HR 8334, SAO 19624, FK5 1572, BD+60°2288, HIP 107418
■Template （■ノート ■解説） ■Project

ケフェウス座ニュー星(ν Cephei)は、ケフェウス座にある、スペクトル分類A2、4等級の恒星である。白く明滅するはくちょう座アルファ型変光星で、地球から約4,700光年離れている。

ケフェウス座ミュー星やケフェウス座VV星も含む[6]ケフェウス座OB2アソシエーションの一員である[5]。約20太陽質量[7][5]の恒星として約800万年前に生まれ、現在は核内の水素を使い尽くして冷え、超巨星となっている。構成元素の分析では、まだ赤色超巨星になって間もなく、汲み上げ効果により核融合物質を対流により恒星表面に運んでいるところである[5]。

ケフェウス座ニュー星は、太陽質量の15倍、太陽半径の190倍、太陽光度の10万倍である。その大きさと明るさのため、いくらか不安定で、不規則な脈動をする。これは、A型やB型の超巨星ではくちょう座アルファ型変光星に分類されるものの共通の特徴である。明るさは最大10倍変動する[2]。

脚注

注釈

  1. ^ 視等級 + 5 + 5×log（年周視差（秒））より計算。小数第1位まで表記

出典

  1. ^ a b c d e Firnstein, M.; Przybilla, N. (2012). "Quantitative spectroscopy of Galactic BA-type supergiants. I. Atmospheric parameters". Astronomy & Astrophysics. 543: A80. arXiv:1207.0308. Bibcode:2012A&A...543A..80F. doi:10.1051/0004-6361/201219034。
  2. ^ a b c Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally Published In: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S。
  3. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357。Vizier catalog entry
  4. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065。
  5. ^ a b c d Yuce, Kutluay (2005). "Spectral Analysis of 4 Lacertae and ν Cephei". Baltic Astronomy. 14: 51. Bibcode:2005BaltA..14...51Y。
  6. ^ Humphreys, R. M. (1978). "Studies of luminous stars in nearby galaxies. I. Supergiants and O stars in the Milky Way". Astrophysical Journal. 38: 309. Bibcode:1978ApJS...38..309H. doi:10.1086/190559。
  7. ^ Firnstein, Markus (2010). Quantitative Spectroscopy of Galactic BA-Type Supergiants (Ph.D.). Erlangen, Nurnberg, Univ.

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