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とけい座R星

とけい座R星
R Horologii
星座 とけい座
見かけの等級 (mv) 4.7 - 14.3[1]
変光星型 ミラ型[2]
位置
元期:J2000.0
赤経 (RA, α)  02h 53m 52.77206s[3]
赤緯 (Dec, δ) −49° 53′ 22.7408″[3]
視線速度 (Rv) 60.00 km/s[3]
固有運動 (μ) 赤経: 130.35 ミリ秒/[3]
赤緯: 34.22 ミリ秒/年[3]
年周視差 (π) 4.76 ± 0.97 ミリ秒[3]
距離 685 光年
(210 パーセク
絶対等級 (MV) -1.9 - 7.7
とけい座中のR星の位置
とけい座中のR星の位置
物理的性質
質量 1.31 M[4]
スペクトル分類 M5-8e II-III[1]
光度 2.7 ×105 L[5]
表面温度 2,900 K[6]
他のカタログでの名称
HD 18242, HIP 13502, HR 868, IRAS 02522-5005[3]
Template (ノート 解説) ■Project

とけい座R星は、とけい座の方向に地球から約685光年の位置にある赤色巨星である。

脈動変光星で、変光周期は407.6日と長く、とても規則的で、光度が最大の時と最小の時では7等級以上明るさが変化するので、ミラ型変光星に分類される[1]。最大光度の時の明るさは周期によって異なり、変光の幅は最大で4.7等級から14.3等級となっている[1]スペクトル型輝線星であることを示し、スペクトル中でマグネシウム原子水素原子のバルマー線が輝線として見える[7][8]

出典

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  1. ^ a b c d VSX: Detail for R Hor”. AAVSO. 2017年3月9日閲覧。
  2. ^ Pojmanski, G. (2002-12), “The All Sky Automated Survey. Catalog of Variable Stars. I. 0 h - 6 hQuarter of the Southern Hemisphere”, Acta Astronomica 52: 397-427, Bibcode2002AcA....52..397P 
  3. ^ a b c d e f g R Hor -- Variable Star of Mira Cet type”. SIMBAD. 2017年3月9日閲覧。
  4. ^ Wyatt, S. P.; Cahn, J. H. (1983-12-01), “Kinematics and ages of Mira variables in the greater solar neighborhood”, Astrophysical Journal 275: 225-239, Bibcode1983ApJ...275..225W, doi:10.1086/161527 
  5. ^ Loup, C.; et al. (1993-06), “O and HCN observations of circumstellar envelopes. A catalogue - Mass loss rates and distributions”, Astronomy and Astrophysics Supplement Series 99 (2): 291-377, Bibcode1993A&AS...99..291L 
  6. ^ Uttenthaler, S.; Lebzelter, T. (2010-02), “Correlation between technetium and lithium in a sample of oxygen-rich AGB variables”, Astronomy and Astrophysics 510: A62, Bibcode2010A&A...510A..62U, doi:10.1051/0004-6361/200912548 
  7. ^ Crowe, Richard A. (1983-10), “A Spectral Catalogue of Southern Hemisphere Mira Variable Stars”, Journal of the AAVSO 12 (2): 58, Bibcode1983JAVSO..12...58C 
  8. ^ Celis S., L. (1984-04), “Red variable stars. II - Spectral classification of Mira variables with phenomenological and photometric procedure”, Astronomical Journal 89 (4): 527-548, Bibcode1984AJ.....89..527C, doi:10.1086/113546 

関連項目

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外部リンク

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座標: 星図 02h 53m 52.77206s, −49° 53′ 22.7408″

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とけい座R星
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