鳖七：修订间差异
Eigenschaften（留言 | 贡献） |
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2018年8月25日 (六) 03:18的版本
| 觀測資料 曆元 J2000.0 | |
|---|---|
| 星座 | Corona Australis |
| 星官 | |
| 赤經 | 19h 06m 25.11014s[1] |
| 赤緯 | −37° 03′ 48.3901″[1] |
| 視星等（V） | 4.20[2] |
| 特性 | |
| 光谱分类 | F8V + F8V[3] |
| U−B 色指数 | +0.51[4] |
| B−V 色指数 | +0.01[4] |
| 天体测定 | |
| 徑向速度 (Rv) | −51.60 ± 0.3[5] km/s |
| 自行 (μ) | 赤经：96.74 ± 1.05[1] mas/yr 赤纬：−281.71 ± 0.58[1] mas/yr |
| 视差 (π) | 57.79 ± 0.75[1] mas |
| 距离 | 56.4 ± 0.7 ly (17.3 ± 0.2 pc) |
| 绝对星等 (MV) | 3.73 / 3.80[6] |
| 軌道[7] | |
| 繞行週期 (P) | 121.76 yr |
| 半長軸 (a) | 1.896" |
| 偏心率 (e) | 0.320 |
| 倾斜角 (i) | 149.6° |
| 升交点黃經 (Ω) | 50.3° |
| 近心点 曆元 (T) | 2000.64 |
| 近心點幅角 (ω) (secondary) | 349.0° |
| 詳細資料 [6] | |
| γ CrA A | |
| 質量 | 1.15 M☉ |
| 半徑 | 1.47 R☉ |
| 表面重力 (log g) | 4.17 |
| 溫度 | 6,090 K |
| 金属量 [Fe/H] | −0.07 dex |
| 年齡 | 5 Gyr |
| γ CrA B | |
| 質量 | 1.14 M☉ |
| 半徑 | 1.42 R☉ |
| 表面重力 (log g) | 4.19 |
| 溫度 | 6,100 K |
| 年齡 | 5 Gyr |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | γ CrA |
| γ CrA A | |
| γ CrA B | |
鳖七（γCrA/南冕座γ）, 是南冕座的一颗聯星。视星等为4.20，[2]因此肉眼可见。基于其恒星视差的测量数据，可知其距离太阳56.4光年（17.3秒差距）。[1] 鳖七是银河系薄盘的一部分。[6]
The system is a visual binary, where the orbit is calculated from observations of one star orbiting the other. The primary, Gamma Coronae Australis A, is a late F-type main-sequence star with an effective temperature of 6,090 K.[6] It has an absolute an absolute magnitude of +3.73, and a mass of 1.15 solar masses.[6] The secondary, Gamma Coronae Australis B, is also F-type. With an effective temperature of 6,100 K, an absolute magnitude of +3.80, and a mass of 1.14 solar masses, the companion is almost identical to the primary.[6] Gamma Coronae Australis has been known to be a binary for a long time, and its two components have been given Henry Draper Catalogue designations of HD 177474[8] and HD 177475,[9] respectively. The two stars are separated by 1.896″ and orbit each other every 121.76 years.[7]
References
- ^ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. November 2007, 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752
. doi:10.1051/0004-6361:20078357.
- ^ 2.0 2.1 2.2 [ * gam CrA] 请检查
|url=值 (帮助). SIMBAD. 斯特拉斯堡天文資料中心. - ^ Eggl, S.; Pilat-Lohinger, E.; Funk, B.; Georgakarakos, N.; Haghighipour, N. Circumstellar habitable zones of binary-star systems in the solar neighbourhood. Monthly Notices of the Royal Astronomical Society. 2012, 428 (4): 3104. Bibcode:2013MNRAS.428.3104E. arXiv:1210.5411 . doi:10.1093/mnras/sts257.
- ^ 4.0 4.1 Mermilliod, J.-C. Compilation of Eggen's UBV data, transformed to UBV (unpublished). Catalogue of Eggen's UBV data. 1986. Bibcode:1986EgUBV........0M.
- ^ Gontcharov, G. A. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system. Astronomy Letters. 2006, 32 (11): 759–771. Bibcode:2006AstL...32..759G. arXiv:1606.08053 . doi:10.1134/S1063773706110065.
- ^ 6.0 6.1 6.2 6.3 6.4 6.5 Fuhrmann, K.; Chini, R. Multiplicity Among F-Type Stars. II. The Astrophysical Journal. 2015, 809: 107. Bibcode:2015ApJ...809..107F. doi:10.1088/0004-637X/809/1/107.
- ^ 7.0 7.1 Sixth Catalog of Orbits of Visual Binary Stars. United States Naval Observatory. [20 June 2017].
- ^ [ * gam CrA A] 请检查
|url=值 (帮助). SIMBAD. 斯特拉斯堡天文資料中心. - ^ [ * gam CrA B] 请检查
|url=值 (帮助). SIMBAD. 斯特拉斯堡天文資料中心.
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