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軒轅增廿二

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軒轅增廿二
軒轅增廿二的位置 (紅圈處)
觀測數據
曆元 J2000.0      分點 J2000.0
星座 巨蟹座
巨蟹座ι A
赤經 08h 46m 41.81988s[1]
赤緯 +28° 45′ 35.6190″[1]
視星等 (V) 4.02[2]
巨蟹座ι B
赤經 08h 46m 39.98118s[1]
赤緯 +28° 45′ 54.1932″[1]
視星等 (V) 6.57[3]
特性
光譜分類G8II-III[4] + A2V[5]
天體測定
巨蟹座ι A
徑向速度 (Rv)15.74 ± 0.13[6] km/s
自行 (μ) 赤經:-21.58 ± 0.75[1] mas/yr
赤緯:-45.69 ± 0.56[1] mas/yr
視差 (π)9.85 ± 0.61[1] mas
距離330 ± 20 ly
(102 ± 6 pc)
絕對星等 (MV)-1
巨蟹座ι B
徑向速度 (Rv)25.00 ± 1.5[7] km/s
自行 (μ) 赤經:-22.74 ± 3.45[1] mas/yr
赤緯:-46.36 ± 2.56[1] mas/yr
詳細資料
巨蟹座ι A
質量3.5 M
半徑22 R
亮度260 L
溫度4,954[8] K
金屬量 [Fe/H]−0.14[6] dex
自轉速度 (v sin i)170[9] km/s
巨蟹座ι B
亮度20 L
溫度8,786[10] K
年齡263[11] Myr
其他命名
48 Cancri
參考資料庫
SIMBAD資料
巨蟹座ι A和B (Jeffrey Fisher)

軒轅增廿二 (ι Cnc/巨蟹座ι) 是一個在巨蟹座雙星,距離地球大約330光年

巨蟹座ι的兩顆星距離30弧秒,只有緩慢的改變。雖然沒有計算出軌道,但兩星的自行十分相似,被認為是有引力關係的。[12]

較亮的巨蟹座ι A,是一個黃色的G型亮巨星視星等4.02。它是個鋇星,認為是由漸近巨星分支星傳輸物質給伴星造成的。在巨蟹座ι系統裡沒有找到這個貢獻者,但是推測有一個未看見的白矮星[13]

較暗的巨蟹座ι B,是一個白色的A型主序星視星等6.57。它是個殼層星,被快速自轉拋出的物質環繞。[14]

參考資料

[編輯]
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  2. ^ Mermilliod, J.-C. Compilation of Eggen's UBV data, transformed to UBV (unpublished). Catalogue of Eggen's UBV data. 1986. Bibcode:1986EgUBV........0M. 
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  4. ^ Keenan, Philip C.; McNeil, Raymond C. The Perkins catalog of revised MK types for the cooler stars. Astrophysical Journal Supplement Series. 1989, 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373. 
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  6. ^ 6.0 6.1 Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey. Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity. The Astronomical Journal. 2008, 135: 209. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209. 
  7. ^ Gontcharov, G. A. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system. Astronomy Letters. 2006, 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  8. ^ Kovtyukh, V. V.; Chekhonadskikh, F. A.; Luck, R. E.; Soubiran, C.; Yasinskaya, M. P.; Belik, S. I. Accurate luminosities for F-G supergiants from FeII/FeI line depth ratios. Monthly Notices of the Royal Astronomical Society. 2010, 408 (3): 1568. Bibcode:2010MNRAS.408.1568K. doi:10.1111/j.1365-2966.2010.17217.x. 
  9. ^ 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. Astronomy and Astrophysics. 2002, 393 (3): 897. Bibcode:2002A&A...393..897R. doi:10.1051/0004-6361:20020943. 
  10. ^ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. Fundamental parameters and infrared excesses of Hipparcos stars. Monthly Notices of the Royal Astronomical Society. 2012, 427: 343. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. 
  11. ^ Takeda, Yoichi; Sato, Bun'ei; Murata, Daisuke. Stellar Parameters and Elemental Abundances of Late-G Giants. Publications of the Astronomical Society of Japan. 2008, 60 (4): 781. Bibcode:2008PASJ...60..781T. doi:10.1093/pasj/60.4.781. 
  12. ^ Eggen, Olin J. Photometry of F-K type bright giants and supergiants. 3: The luminosity, reddening, and heavy element abundance of GK stars. The Astronomical Journal. 1994, 107: 2184. Bibcode:1994AJ....107.2184E. doi:10.1086/117030. 
  13. ^ Eggleton, P. P.; Tokovinin, A. A. A catalogue of multiplicity among bright stellar systems. Monthly Notices of the Royal Astronomical Society. 2008, 389 (2): 869. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. 
  14. ^ Hauck, B.; Jaschek, C. A-shell stars in the Geneva system. Astronomy and Astrophysics. 2000, 354: 157. Bibcode:2000A&A...354..157H.