克鲁格60
外观
观测数据 历元 J2000 分点 | |
---|---|
星座 | 仙王座 |
Kruger 60 A | |
赤经 | 22h 27m 59.4677s[1] |
赤纬 | +57° 41′ 45.150″[1] |
视星等 (V) | 9.59 |
Kruger 60 B | |
赤经 | 22h 27m 59.568s[1] |
赤纬 | +57° 41′ 45.28″[1] |
视星等 (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 | 无/耀星 |
天体测定 | |
径向速度 (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 |
详细资料 | |
质量 | 0.271/0.176[3] M☉ |
半径 | 0.35/0.24[4] R☉ |
亮度 | 0.010/0.0034 L☉ |
温度 | 3180/2890 K K |
金属量 | –0.04[5] |
轨道[6] | |
主星 | Kruger 60 A |
伴星 | Kruger 60 B |
绕行周期 (P) | 44.67 yr |
半长轴 (a) | 2.383" |
偏心率 (e) | 0.410 |
倾斜角 (i) | 167.2° |
升交点黄经 (Ω) | 154.5° |
近心点 历元 (T) | 1970.22 |
近心点幅角 (ω) (primary) | 211.0° |
其他命名 | |
克鲁格60(Kruger 60)是一个距离地球13.15 光年的联星系统。系统内的两颗红矮星以周期44.6年互绕。
概述
[编辑]系统中较大的称为克鲁格60A,较小的称为克鲁格60B。较大的克鲁格60A质量约太阳的27%,半径则为太阳的35%;较小的克鲁格60B其质量约太阳的18%,半径约太阳的24%[3][4]。克鲁格60B是一颗耀星,其变星编号为仙王座DO("DO Cephei").[8]。克鲁格60B光度会不规则变化,会在光度加倍后经过8分钟又恢复原本光度[来源请求]。
系统中的两颗恒星平均距离约9.5天文单位,大约是太阳和土星的平均距离。但两者之间的椭圆形轨道使其距离在5.5到13.5天文单位之间变化[来源请求]。
该系统在距离银河系核心7–9 kpc的距离环绕银河系中心,轨道离心率约0.126–0.130[9]。该系统将在88,600年后最接近太阳,大约是1.95秒差距[10]。
参考资料
[编辑]- ^ 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.
延伸阅读
[编辑]- 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)
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