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天苑十一

(重定向自波江座τ4

天苑十一(波江座τ4)是位于波江座双星系统,其视星等为3.65。

天苑十一
觀測資料
曆元 J2000.0 (ICRS)
星座 波江座
星官
赤經 03h 19m 31.00224s[1]
赤緯 −21° 45′ 28.3049″[1]
視星等(V) 3.65[2]
特性
光谱分类M3/4 III[3]
U−B 色指数+1.79[2]
B−V 色指数+1.61[2]
变星类型Lb[4]
天体测定
徑向速度 (Rv)+41.7±0.7[5] km/s
自行 (μ) 赤经:+51.89[1] mas/yr
赤纬:+32.92[1] mas/yr
视差 (π)10.71 ± 0.54[1] mas
距离300 ± 20 ly
(93 ± 5 pc)
绝对星等 (MV)−0.79[6]
詳細資料
質量1.8±0.3[7] M
半徑106[8] R
亮度1,537[9] L
溫度3,712[7] K
其他命名
τ4 Eridani, τ4 Eri, 16 Eridani, BD-22° 584, HD 20720, HIP 15474, HR 1003, SAO 168460.[10]
參考資料庫
SIMBADdata

参考文献编辑

  1. ^ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752, doi:10.1051/0004-6361:20078357. 
  2. ^ 2.0 2.1 2.2 Mermilliod, J.-C., Compilation of Eggen's UBV data, transformed to UBV (unpublished), SIMBAD, 1986, Bibcode:1986EgUBV........0M. 
  3. ^ Houk, N.; Smith-Moore, M., Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars 4, 1988, Bibcode:1988MSS...C04....0H. 
  4. ^ Ruban, E. V.; 等, Spectrophotometric observations of variable stars, Astronomy Letters, September 2006, 32 (9): 604–607, Bibcode:2006AstL...32..604R, doi:10.1134/S1063773706090052. 
  5. ^ Gontcharov, G. A., Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system, Astronomy Letters, November 2006, 32 (11): 759–771, Bibcode:2006AstL...32..759G, arXiv:1606.08053, doi:10.1134/S1063773706110065. 
  6. ^ Cardini, D., Mg II chromospheric radiative loss rates in cool active and quiet stars, Astronomy and Astrophysics, January 2005, 430: 303−311, Bibcode:2005A&A...430..303C, arXiv:astro-ph/0409683, doi:10.1051/0004-6361:20041440. 
  7. ^ 7.0 7.1 Halabi, Ghina M.; Eid, Mounib El. Exploring masses and CNO surface abundances of red giant stars. Monthly Notices of the Royal Astronomical Society. 2015, 451 (3): 2957. Bibcode:2015MNRAS.451.2957H. arXiv:1507.01517. doi:10.1093/mnras/stv1141. 
  8. ^ Lang, Kenneth R., Astrophysical formulae, Astronomy and astrophysics library 1 3, Birkhäuser, 2006, ISBN 3-540-29692-1.  The radius (R*) is given by:
     
  9. ^ McDonald, I.; 等, Fundamental Parameters and Infrared Excesses of Hipparcos Stars, Monthly Notices of the Royal Astronomical Society, 2012, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037, doi:10.1111/j.1365-2966.2012.21873.x. 
  10. ^ tau04 Eri. SIMBAD. 斯特拉斯堡天文資料中心. [2016-10-13].