女三
| 觀測資料 曆元 J2000 | |
|---|---|
| 星座 | 寶瓶座 |
| 星官 | 女(女宿) |
| 赤經 | 20h 51m 25.74827s[1] |
| 赤緯 | -05° 37′ 35.8719″[1] |
| 視星等(V) | 5.99[2] (6.40 + 7.43)[3] |
| 特性 | |
| 光谱分类 | F7 IV + F6: V:[4] |
| B−V 色指数 | 0.464±0.003[2] |
| 天体测定 | |
| 徑向速度 (Rv) | −21.50[5] km/s |
| 自行 (μ) | 赤经:95.47[1] mas/yr 赤纬:1.78[1] mas/yr |
| 视差 (π) | 16.47 ± 0.59[1] mas |
| 距离 | 198 ± 7 ly (61 ± 2 pc) |
| 绝对星等 (MV) | 2.15[6] |
| 軌道[7] | |
| 繞行週期 (P) | 200.7±1.1 yr |
| 半長軸 (a) | 0.816±0.006" |
| 偏心率 (e) | 0.535+0.006 −0.005 |
| 倾斜角 (i) | 64.06+0.26 −0.27° |
| 升交点黃經 (Ω) | 174.31+0.38 −0.39° |
| 近心点 曆元 (T) | B 1,896.8+0.39 −0.40 |
| 近心點幅角 (ω) (secondary) | 45.9±1.2° |
| 詳細資料 [6] | |
| 寶瓶座4A | |
| 質量 | 1.618±0.004[7] M☉ |
| 表面重力 (log g) | 3.79 |
| 亮度 | 11.0 L☉ |
| 溫度 | 6,440 K |
| 金属量 [Fe/H] | 0.18[8] dex |
| 自轉速度 (v sin i) | 34.6 km/s |
| 年齡 | 1.60[8] Gyr |
| 4 Aqr B | |
| 質量 | 1.331±0.003[7] M☉ |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | 4 Aqr |
| 4 Aqr A | |
| 4 Aqr B | |
女三(寶瓶座4,英語:4 Aquarii,縮寫為4 Aqr)是在黃道,也是天球赤道星座寶瓶座中的一對聯星[9],位於距離太陽約198光年[1]。「寶瓶座4」是來自佛蘭斯蒂德命名法的名稱。肉眼可見為一顆暗淡的黃白色恆星,綜合視星等為5.99[2]。系統正以 −21.5km/s的日心徑向速度接近地球[5]。
這是一個視覺聯星,軌道週期為200.7年,離心率為0.535[7]。主星標示為寶瓶座4A,視星等為6.40[3],是一顆F型次巨星,其恆星分類為F7IV[4],這暗示它已經耗盡了核心的氫,並且從主序星中演化出來[7]。其動態測量質量為1.6太陽質量[7],且在6,440K的有效溫度下,從光球層輻射出11倍的太陽光度[6]。伴星標示為寶瓶座4B,視星等7.43[3],是一顆疑似屬於F6V型的F型主序星[4]。估計這對連星已有16億年的歷史[8]。
參考文獻
- ^ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664. Bibcode:2007A&A...474..653V. S2CID 18759600. arXiv:0708.1752
. doi:10.1051/0004-6361:20078357.
- ^ 2.0 2.1 2.2 Anderson, E.; Francis, Ch. XHIP: An extended hipparcos compilation. Astronomy Letters. 2012, 38 (5): 331. Bibcode:2012AstL...38..331A. S2CID 119257644. arXiv:1108.4971
. doi:10.1134/S1063773712050015.
- ^ 3.0 3.1 3.2 Mason, B. D.; et al, The Washington Visual Double Star Catalog, The Astronomical Journal, 2014, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
- ^ 4.0 4.1 4.2 Corbally, C. J.; Garrison, R. F. New spectral classifications on the MK system for visual double stars. Publications of the Astronomical Society of the Pacific. August 1980, 92: 493–496. Bibcode:1980PASP...92..493C. S2CID 121017167. doi:10.1086/130700.
- ^ 5.0 5.1 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. S2CID 119231169. arXiv:1606.08053
. doi:10.1134/S1063773706110065.
- ^ 6.0 6.1 6.2 Luck, R. Earle. Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants. The Astronomical Journal. January 2017, 153 (1): 19. Bibcode:2017AJ....153...21L. S2CID 119511744. arXiv:1611.02897
. doi:10.3847/1538-3881/153/1/21
. 21.
- ^ 7.0 7.1 7.2 7.3 7.4 7.5 Mendez, Rene A.; et al. Orbits for 18 Visual Binaries and Two Double-line Spectroscopic Binaries Observed with HRCAM on the CTIO SOAR 4 m Telescope, Using a New Bayesian Orbit Code Based on Markov Chain Monte Carlo. The Astronomical Journal. November 2017, 154 (5): 22. Bibcode:2017AJ....154..187M. S2CID 55695873. arXiv:1709.06582
. doi:10.3847/1538-3881/aa8d6f
. 187.
- ^ 8.0 8.1 8.2 Casagrande, L.; et al. New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey. Astronomy and Astrophysics. June 2011, 530: A138. Bibcode:2011A&A...530A.138C. S2CID 56118016. arXiv:1103.4651
. doi:10.1051/0004-6361/201016276.
- ^ 9.0 9.1 * 4 Aqr. SIMBAD. 斯特拉斯堡天文資料中心.