狐狸座SV
SV Vulpeculae
| 观测资料 历元 J2000 | |
|---|---|
| 星座 | 狐狸座 |
| 星官 | |
| 赤经 | 19h 51m 30.90640s[1] |
| 赤纬 | 27° 27′ 36.8307″[1] |
| 视星等（V） | 6.72 - 7.79[2] |
| 特性 | |
| 光谱分类 | F7Iab-K0Iab[2] |
| U−B 色指数 | +0.868 - +1.659[3] |
| B−V 色指数 | +1.149 - +1.786[3] |
| 变星类型 | δ Cep[2] |
| 天体测定 | |
| 径向速度 (Rv) | −2.00[4] km/s |
| 自行 (μ) | 赤经：−1.50[1] mas/yr 赤纬：−6.57[1] mas/yr |
| 视差 (π) | 0.180 ± 0.81[1] mas |
| 距离 | 2,450[5] pc |
| 绝对星等 (MV) | −6.21[5] |
| 详细资料 | |
| 质量 | 14.6 - 15.8[6] M☉ |
| 半径 | 187.9 - 238.4[7] R☉ |
| 表面重力 (log g) | 0.50 - 1.60[8] |
| 亮度 | 19,800[9] L☉ |
| 温度 | 4,861 - 6,110[8] K |
| 金属量 | +0.05[8] |
| 其他命名 | |
| 参考资料库 | |
| SIMBAD | 资料 |
狐狸座SV是为在狐狸座的造父变星。它是一颗次巨星，距离地球大约8,000光年。
狐狸座SV 这颗造父变星的视星等范围在6.72至7.79，周期为45.0121天。光变曲线高度的不对称，从极小上升到极大只是从极大到极小的三分之一[10]。周期并以每年214秒的速率衰减[9]。
狐狸座SV是一颗黄色的次巨星，光度约是太阳的20,000倍，光谱类型从晚期的F型变化至早期的K型。它的脉动和温度变化范围会低于5,000度并超过6,000度[8]，半径是最大时为216.5 R☉，胀缩的范围在188 R☉至238 R☉[7]。
狐狸座SV 的质量现在大约是15 M☉，并且估计在主序列时大约为17 M☉。这段时期的变化和大气丰度显示，这颗恒星是第二次穿越不稳定带。第一次穿越不稳定带是从主序星迅速过渡到变成红巨星时，第二次穿越是在氦核心燃烧时，恒星进入蓝回圈，变得更热之后再回到红巨星阶段[9]。
参考资料
[编辑]- ^ 1.0 1.1 1.2 1.3 1.4 Van Leeuwen, F. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 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 Samus, N. N.; Durlevich, O. V.; et al. VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013). VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 2009, 1. Bibcode:2009yCat....102025S.
- ^ 3.0 3.1 Berdnikov, L. N. VizieR Online Data Catalog: Photoelectric observations of Cepheids in UBV(RI)c (Berdnikov, 2008). VizieR On-line Data Catalog: II/285. Originally published in: 2008yCat.2285....0B. 2008, 2285. Bibcode:2008yCat.2285....0B.
- ^ Gontcharov, G. A. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system. Astronomy Letters. 2006, 32 (11): 759. Bibcode:2006AstL...32..759G. arXiv:1606.08053 . doi:10.1134/S1063773706110065.
- ^ 5.0 5.1 Groenewegen, M. A. T. Baade-Wesselink distances and the effect of metallicity in classical cepheids. Astronomy and Astrophysics. 2008, 488: 25. Bibcode:2008A&A...488...25G. arXiv:0807.1269 . doi:10.1051/0004-6361:200809859.
- ^ Caputo, F.; Bono, G.; Fiorentino, G.; Marconi, M.; Musella, I. Pulsation and Evolutionary Masses of Classical Cepheids. I. Milky Way Variables. The Astrophysical Journal. 2005, 629 (2): 1021. Bibcode:2005ApJ...629.1021C. arXiv:astro-ph/0505149 . doi:10.1086/431641.
- ^ 7.0 7.1 Imbert, M. Détermination des rayons de Céphéides. V. Vitesses radiales et dimensions de 22 Céphéides galactiques. Determination of the radii of Cepheids V. Radial velocities and dimensions of 22 galactic Cepheids. Astronomy and Astrophysics Supplement. 1999, 140: 79. Bibcode:1999A&AS..140...79I. doi:10.1051/aas:1999515.
- ^ 8.0 8.1 8.2 8.3 Kovtyukh, V. V.; Andrievsky, S. M.; Belik, S. I.; Luck, R. E. Phase-dependent Variation of the Fundamental Parameters of Cepheids. II. Periods Longer than 10 Days. The Astronomical Journal. 2005, 129: 433. Bibcode:2005AJ....129..433K. doi:10.1086/426339.
- ^ 9.0 9.1 9.2 Turner, D. G.; Berdnikov, L. N. On the crossing mode of the long-period Cepheid SV Vulpeculae. Astronomy and Astrophysics. 2004, 423: 335. Bibcode:2004A&A...423..335T. doi:10.1051/0004-6361:20040163.
- ^ Schaltenbrand, R.; Tammann, G. A. The light curve parameters of photoelectrically observed galactic Cepheids. Astronomy and Astrophysics Supplement. 1971, 4: 265. Bibcode:1971A&AS....4..265S.
