克魯格60
克魯格60(Kruger 60)是一個距離地球13.15 光年的聯星系統。系統內的兩顆紅矮星以周期44.6年互繞。
观测数据 曆元 J2000 分點 | |
---|---|
星座 | 仙王座 |
Kruger 60 A | |
赤經 | 22h 27m 59.4677s[1] |
赤緯 | +57° 41′ 45.150″[1] |
視星等 (V) | 9.59 |
Kruger 60 B | |
赤經 | 22h 27m 59.568s[1] |
赤緯 | +57° 41′ 45.28″[1] |
視星等 (V) | 11.40 |
特性 | |
光谱分类 | M3V/M4V[2] |
U−B 色指数 | 1.27/1.3 |
B−V 色指数 | 1.65/1.8 |
变星类型 | 無/耀星 |
天体测定 | |
徑向速度 (Rv) | –33.1/–31.9 km/s |
自行 (μ) | 赤经:–870.23 mas/yr 赤纬:–471.10 mas/yr |
视差 (π) | 248.06 ± 1.39 mas |
距离 | 13.15 ± 0.07 ly (4.03 ± 0.02 pc) |
绝对星等 (MV) | 11.76/13.46 |
詳細資料 | |
質量 | 0.271/0.176[3] M☉ |
半徑 | 0.35/0.24[4] R☉ |
亮度 | 0.010/0.0034 L☉ |
溫度 | 3180/2890 K K |
金屬量 | –0.04[5] |
軌道[6] | |
主星 | Kruger 60 A |
伴星 | Kruger 60 B |
繞行週期 (P) | 44.67 yr |
半長軸 (a) | 2.383" |
偏心率 (e) | 0.410 |
倾斜角 (i) | 167.2° |
升交点黃經 (Ω) | 154.5° |
近心点 曆元 (T) | 1970.22 |
近心點幅角 (ω) (primary) | 211.0° |
其他命名 | |
概述
系統中較大的稱為克魯格60A,較小的稱為克魯格60B。較大的克魯格60A質量約太陽的27%,半徑則為太陽的35%;較小的克魯格60B其質量約太陽的18%,半徑約太陽的24%[3][4]。克魯格60B是一顆耀星,其變星編號為仙王座DO("DO Cephei").[8]。克魯格60B光度會不規則變化,會在光度加倍後經過8分鐘又恢復原本光度[來源請求]。
系統中的兩顆恆星平均距離約9.5天文單位,大約是太陽和土星的平均距離。但兩者之間的橢圓形軌道使其距離在5.5到13.5天文單位之間變化[來源請求]。
該系統在距離銀河系核心7–9 kpc的距離環繞銀河系中心,軌道離心率約0.126–0.130[9]。該系統將在88,600年後最接近太陽,大約是1.95秒差距[10]。
參考資料
- ^ 1.0 1.1 1.2 1.3 Perryman, M. A. C.; et al. The Hipparcos Catalogue. Astronomy and Astrophysics. 1997, 323: L49–L52. Bibcode:1997A&A...323L..49P.
- ^ Henry, Todd J.; et al. The solar neighborhood, 1: Standard spectral types (K5-M8) for northern dwarfs within eight parsecs. The Astronomical Journal. October 1994, 108 (4): 1437–1444. Bibcode:1994AJ....108.1437H. doi:10.1086/117167.
- ^ 3.0 3.1 Delfosse, X.; et al. Accurate masses of very low mass stars. IV. Improved mass-luminosity relations. Astronomy and Astrophysics. December 2000, 364: 217–224. Bibcode:2000A&A...364..217D. arXiv:astro-ph/0010586 .
- ^ 4.0 4.1 Pasinetti Fracassini, L. E.; et al. Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics. Astronomy and Astrophysics. February 2001, 367 (2): 521–524. Bibcode:2001A&A...367..521P. arXiv:astro-ph/0012289 . doi:10.1051/0004-6361:20000451. The data is from the Vizier II/224 (页面存档备份,存于互联网档案馆) catalogue.
- ^ Bonfils, X.; et al. Metallicity of M dwarfs. I. A photometric calibration and the impact on the mass-luminosity relation at the bottom of the main sequence. Astronomy and Astrophysics. November 2005, 442 (2): 635–642. Bibcode:2005A&A...442..635B. arXiv:astro-ph/0503260 . doi:10.1051/0004-6361:20053046. Only listed for component A.
- ^ Heintz, W. D. Orbits of 20 visual binaries. Astronomy and Astrophysics Supplement Series. August 1986, 65 (2): 411–417. Bibcode:1986A&AS...65..411H.
- ^ NSV 14168 – Variable Star. SIMBAD. Centre de Données astronomiques de Strasbourg. [2009-09-28]. (原始内容存档于2020-07-07).
- ^ White, Stephen M.; et al. A VLA survey of nearby flare stars. Astrophysical Journal Supplement Series. December 1989, 71: 895–904. Bibcode:1989ApJS...71..895W. doi:10.1086/191401.
- ^ Allen, C.; Herrera, M. A. The galactic orbits of nearby UV Ceti stars. Revista Mexicana de Astronomia y Astrofisica. 1998, 34: 37–46. Bibcode:1998larm.confE.115A.
- ^ García-Sánchez, J.; et al. Stellar encounters with the solar system. Astronomy and Astrophysics. November 2001, 379 (2): 634–659. Bibcode:2001A&A...379..634G. doi:10.1051/0004-6361:20011330.
延伸閱讀
- James Kaler, Extreme Stars, (Cambridge: Cambridge UP, 2001), p. 32.
- Hires LRGB CCD Image (页面存档备份,存于互联网档案馆)