金牛座V471
金牛座V471（缩写：V471 Tau）是在金牛座的一颗食变星。这颗恒星的视星等为9等，因此无法用肉眼直接看到。它距离太阳系大约155光年。
| 观测资料 历元 J2000 | |
|---|---|
| 星座 | Taurus |
| 星官 | |
| 赤经 | 03h 50m 24.9667s[2] |
| 赤纬 | 17° 14′ 47.431″[2] |
| 视星等（V） | 9.40 - 9.71[3] |
| 特性 | |
| 演化阶段 | K2V + D2[4] |
| 变星类型 | Algol + RS CVn[3] |
| 天体测定 | |
| 径向速度 (Rv) | 37.4±0.5[5] km/s |
| 自行 (μ) | 赤经：127.278[2] mas/yr 赤纬：−22.321[2] mas/yr |
| 视差 (π) | 21.0129 ± 0.0158[2] mas |
| 距离 | 155.2 ± 0.1 ly (47.59 ± 0.04 pc) |
| 轨道[6] | |
| 绕行周期 (P) | 0.52118 日 |
| 半长轴 (a) | 0.01496 AU |
| 偏心率 (e) | 0（假定） |
| 倾斜角 (i) | 80.8° |
| 详细资料 | |
| 白矮星 | |
| 质量 | 0.792[6] M☉ |
| 半径 | 0.01134[6] R☉ |
| 表面重力 (log g) | 8.227[6] |
| 亮度 | 0.145[7] L☉ |
| 温度 | 34,500[7] K |
| K star | |
| 质量 | 0.852[6] M☉ |
| 半径 | 0.816[6] R☉ |
| 表面重力 (log g) | 4.49[8] |
| 亮度 | 0.41[9] L☉ |
| 温度 | 5,066[8] K |
| 自转 | 0.5211 days[9] |
| 自转速度 (v sin i) | 89.30[8] km/s |
| 年龄 | 625[8] Myr |
| Other designations | |
| 参考数据库 | |
| SIMBAD | 资料 |
物理特性
金牛座V471系统至少有两个成员：一颗光谱类型为D2的白矮星；和K型主序星（K2V）。食的时间有一些变化，一度被认为是由于系统的第三个成员，被认为是棕矮星，但这已经被排除，食的变化可能是由苹果门机制引起的。该系统位于毕宿星团[6]。
参考资料
- ^ MAST: Barbara A. Mikulski Archive for Space Telescopes. Space Telescope Science Institute. [8 December 2021]. （原始内容存档于2023-03-27）.
- ^ 2.0 2.1 2.2 2.3 2.4 Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211
. doi:10.1051/0004-6361/202243940 . 已忽略未知参数|collaboration=(帮助) Gaia DR3 record for this source at VizieR. - ^ 3.0 3.1 Samus, N. N.; et al. General Catalogue of Variable Stars. Astronomy Reports. 5.1. 2017, 61 (1): 80–88. Bibcode:2017ARep...61...80S. S2CID 125853869. doi:10.1134/S1063772917010085.
- ^ Hussain, G. A. J.; Allende Prieto, C.; Saar, S. H.; Still, M. Spot patterns and differential rotation in the eclipsing pre-cataclysmic variable binary, V471 Tau. Monthly Notices of the Royal Astronomical Society. 2006, 367 (4): 1699–1708. Bibcode:2006MNRAS.367.1699H. S2CID 15303415. arXiv:astro-ph/0602562 . doi:10.1111/j.1365-2966.2006.10073.x.
- ^ Karataș, Yüksel; Bilir, Selçuk; Eker, Zeki; Demircan, Osman; Liebert, James; Hawley, Suzanne L.; Fraser, Oliver J.; Covey, Kevin R.; Lowrance, Patrick; Kirkpatrick, J. Davy; Burgasser, Adam J. Kinematics of chromospherically active binaries and evidence of an orbital period decrease in binary evolution. Monthly Notices of the Royal Astronomical Society. 2004, 349 (3): 1069–1092. Bibcode:2004MNRAS.349.1069K. S2CID 15290475. arXiv:astro-ph/0404219 . doi:10.1111/j.1365-2966.2004.07588.x.
- ^ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 Muirhead, Philip S.; Nordhaus, Jason; Drout, Maria R. Revised Stellar Parameters for V471 Tau, A Post-common Envelope Binary in the Hyades. The Astronomical Journal. 2022, 163 (1): 34. Bibcode:2022AJ....163...34M. S2CID 244116994. arXiv:2111.06905 . doi:10.3847/1538-3881/ac390f.
- ^ 7.0 7.1 Vaccaro, T. R.; Wilson, R. E.; Van Hamme, W.; Terrell, Dirk. The V471 Tauri System: A Multi-data-type Probe. The Astrophysical Journal. 2015, 810 (2): 157. Bibcode:2015ApJ...810..157V. S2CID 119256081. arXiv:1506.05067 . doi:10.1088/0004-637X/810/2/157.
- ^ 8.0 8.1 8.2 8.3 Zaire, B.; Donati, J. -F.; Klein, B. Magnetic field and activity phenomena of the K2 dwarf V471 Tau. Monthly Notices of the Royal Astronomical Society. 2021, 504 (2): 1969. Bibcode:2021MNRAS.504.1969Z. arXiv:2104.02619 . doi:10.1093/mnras/stab1019.
- ^ 9.0 9.1 Kővári, Zs; Kriskovics, L.; Oláh, K.; Odert, P.; Leitzinger, M.; Seli, B.; Vida, K.; Borkovits, T.; Carroll, T. A confined dynamo: Magnetic activity of the K-dwarf component in the pre-cataclysmic binary system V471 Tauri. Astronomy and Astrophysics. 2021, 650: A158. Bibcode:2021A&A...650A.158K. S2CID 232105205. arXiv:2103.02041 . doi:10.1051/0004-6361/202140707.
