軒轅增廿二
  | |
| 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 |
軒轅增廿二 (ι Cnc/巨蟹座ι) 是一個在巨蟹座的雙星，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系統裏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
- ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- ^ Mermilliod, J.-C. Compilation of Eggen's UBV data, transformed to UBV (unpublished). Catalogue of Eggen's UBV data. 1986. Bibcode:1986EgUBV........0M.
- ^ Ducati, J. R. VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system. CDS/ADC Collection of Electronic Catalogues. 2002, 2237. Bibcode:2002yCat.2237....0D.
- ^ 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.
- ^ Grenier, S.; Baylac, M.-O.; Rolland, L.; Burnage, R.; Arenou, F.; Briot, D.; Delmas, F.; Duflot, M.; Genty, V.; Gómez, A. E.; Halbwachs, J.-L.; Marouard, M.; Oblak, E.; Sellier, A. Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS. Astronomy and Astrophysics Supplement. 1999, 137 (3): 451. Bibcode:1999A&AS..137..451G. doi:10.1051/aas:1999489.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ Hauck, B.; Jaschek, C. A-shell stars in the Geneva system. Astronomy and Astrophysics. 2000, 354: 157. Bibcode:2000A&A...354..157H.