维基百科
巨蟹座EI
天球赤道座標： 08h 58m 15.194s，+19° 45′ 47.08″
巨蟹座EI，又稱為G 9-38或 GJ 1116，此恆星系統是由兩顆位於巨蟹座的紅矮星組成。[11]該系統相對較近，距太陽16.8光年。[12] 該系統具有非常高的恆星耀斑活動，平均每小時有五次耀斑。[1]
巨蟹座EI上的幾個耀斑的紫外線波段[1] | |
| 觀測資料 曆元 J2000 | |
|---|---|
| 星座 | 巨蟹座 |
| 星官 | |
| 赤經 | 08h 58m 15.194s[2] |
| 赤緯 | +19° 45′ 47.08″[2] |
| 視星等（V） | 13.720[3] |
| 特性 | |
| 光谱分类 | M8Ve+M7V[4][5] |
| 天体测定 | |
| G 9-38 A | |
| 徑向速度 (Rv) | 13 ± 5[6] km/s |
| 自行 (μ) | 赤经：−767.060±0.122[7] mas/yr 赤纬：−100.176±0.083[7] mas/yr |
| 视差 (π) | 194.1443 ± 0.1228[7] mas |
| 距离 | 16.8 ± 0.01 ly (5.151 ± 0.003 pc) |
| G 9-38 B | |
| 自行 (μ) | 赤经：−937.133±0.190[8] mas/yr 赤纬：−34.559±0.138[8] mas/yr |
| 视差 (π) | 196.2619 ± 0.1976[8] mas |
| 距离 | 16.62 ± 0.01 ly (5.095 ± 0.005 pc) |
| 軌道 | |
| 主星 | G 9-38A |
| 伴星 | G 9-38B |
| 繞行週期 (P) | 360 yr |
| 半長軸 (a) | 33 AU |
| 詳細資料 [9][10] | |
| G 9-38A | |
| 質量 | 0.12 M☉ |
| 亮度 (bolometric) | 0.000965 L☉ |
| 溫度 | 2896+18 − K |
| 金属量 [Fe/H] | -0.12(未確實) dex |
| G 9-38B | |
| 質量 | 0.10 M☉ |
| 亮度 (bolometric) | 0.000992 L☉ |
| 其他命名 | |
| 參考資料庫 | |
| SIMBAD | The system |
| A | |
| B | |
G 9-38 巨蟹座EI在巨蟹座中的位置 | |
2015年，對系統中第三顆星的搜索沒有得出結論。[13]
參考資料
- ^ 1.0 1.1 Pettersen, B. R. Discovery of flare activity on the low luminosity red dwarf system G9-38 AB. Astronomy & Astrophysics. July 1985, 148: 151–154 [11 November 2021]. Bibcode:1985A&A...148..151P.
- ^ 2.0 2.1 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003). CDS/ADC Collection of Electronic Catalogues. 2003, 2246: II/246. Bibcode:2003yCat.2246....0C.
- ^ Zacharias, N. The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4). VizieR On-line Data Catalog. 2012. Bibcode:2012yCat.1322....0Z.
- ^ G9-38A. SIMBAD. 斯特拉斯堡天文資料中心.
- ^ G9-38B. SIMBAD. 斯特拉斯堡天文資料中心.
- ^ G9-38. SIMBAD. 斯特拉斯堡天文資料中心.
- ^ 7.0 7.1 7.2 Brown, A. G. A.; et al. Gaia Early Data Release 3: Summary of the contents and survey properties. Astronomy & Astrophysics. 2021, 649: A1. Bibcode:2021A&A...649A...1G. S2CID 227254300. arXiv:2012.01533 . doi:10.1051/0004-6361/202039657 . 已忽略未知参数
|collaboration=(帮助) (勘误: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR. - ^ 8.0 8.1 8.2 Brown, A. G. A.; et al. Gaia Early Data Release 3: Summary of the contents and survey properties. Astronomy & Astrophysics. 2021, 649: A1. Bibcode:2021A&A...649A...1G. S2CID 227254300. arXiv:2012.01533 . doi:10.1051/0004-6361/202039657 . 已忽略未知参数
|collaboration=(帮助) (勘误: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR. - ^ Rojas-Ayala, Bárbara; Covey, Kevin R.; Muirhead, Philip S.; Lloyd, James P., Metallicity and Temperature Indicators in M dwarf K band Spectra: Testing New & Updated Calibrations With Observations of 133 Solar Neighborhood M dwarfs, The Astrophysical Journal, 2011, 748 (2): 93, S2CID 41902340, arXiv:1112.4567 , doi:10.1088/0004-637X/748/2/93
- ^ Nearby Star Summary Table
- ^ Vizier query: Name=G* 1116, Centre de Données astronomiques de Strasbourg , accessed 30 December 2012.
- ^ Nearby Stars Catalog (NSC) 互联网档案馆的，存档日期2021-02-27., Planetary Habitability Laboratory, University of Puerto Rico at Arecibo accessed 31 December 2012.
- ^ Davison, Cassy L.; White, R. J.; Henry, T. J.; Riedel, A. R.; Jao, W-C.; Bailey Iii, J. I.; Quinn, S. N.; Cantrell, J. R.; Subasavage, J. P.; Winters, J. G., A 3D Search for Companions to 12 Nearby M-Dwarfs, The Astronomical Journal, 2015, 149 (3): 106, Bibcode:2015AJ....149..106D, S2CID 9719725, arXiv:1501.05012 , doi:10.1088/0004-6256/149/3/106
- Dittmann, Jason A.; Irwin, Jonathan M.; Charbonneau, David; Berta-Thompson, Zachory K. Trigonometric Parallaxes for 1507 Nearby Mid-to-late M Dwarfs. The Astrophysical Journal. 2014, 784 (2): 156. Bibcode:2014ApJ...784..156D. S2CID 18789867. arXiv:1312.3241 . doi:10.1088/0004-637X/784/2/156. Table with parallaxes.