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金牛座V471

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金牛座V471

根據「TESS」數據繪製的金牛座V471的光變曲線[1]
觀測資料
曆元 J2000
星座 Taurus
星官
赤經 03h 50m 24.9667s[2]
赤緯 17° 14′ 47.431″[2]
視星等(V) 9.40 - 9.71[3]
特性
演化階段K2V + D2[4]
變星類型Algol + RS CVn[3]
天體測定
徑向速度 (Rv)37.4±0.5[5] km/s
自行 (μ) 赤經:127.278[2] mas/yr
赤緯:−22.321[2] mas/yr
視差 (π)21.0129 ± 0.0158[2] mas
距離155.2 ± 0.1 ly
(47.59 ± 0.04 pc)
軌道[6]
繞行週期 (P)0.52118 日
半長軸 (a)0.01496 AU
偏心率 (e)0(假定)
傾斜角 (i)80.8°
詳細資料
白矮星
質量0.792[6] M
半徑0.01134[6] R
表面重力 (log g)8.227[6]
亮度0.145[7] L
溫度34,500[7] K
K star
質量0.852[6] M
半徑0.816[6] R
表面重力 (log g)4.49[8]
亮度0.41[9] L
溫度5,066[8] K
自轉0.5211 days[9]
自轉速度 (v sin i)89.30[8] km/s
年齡625[8] Myr
Other designations
471 Tau、​BD+16°516、​HIP 17962
參考資料庫
SIMBAD資料

金牛座V471(縮寫:V471 Tau)是在金牛座的一顆食變星。這顆恆星的視星等為9等,因此無法用肉眼直接看到。它距離太陽系大約155光年。

物理特性

金牛座V471系統至少有兩個成員:一顆光譜類型為D2的白矮星;和K型主序星(K2V)。食的時間有一些變化,一度被認為是由於系統的第三個成員,被認為是棕矮星,但這已經被排除,食的變化可能是由蘋果門機制英語Applegate mechanism引起的。該系統位於畢宿星團[6]

參考資料

  1. ^ MAST: Barbara A. Mikulski Archive for Space Telescopes. Space Telescope Science Institute. [8 December 2021]. (原始內容存檔於2023-03-27). 
  2. ^ 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可免費查閱. doi:10.1051/0004-6361/202243940可免費查閱.  已忽略未知參數|collaboration= (幫助) Gaia DR3 record for this source at VizieR.
  3. ^ 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. 
  4. ^ 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可免費查閱. doi:10.1111/j.1365-2966.2006.10073.x. 
  5. ^ 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可免費查閱. doi:10.1111/j.1365-2966.2004.07588.x. 
  6. ^ 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可免費查閱. doi:10.3847/1538-3881/ac390f. 
  7. ^ 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可免費查閱. doi:10.1088/0004-637X/810/2/157. 
  8. ^ 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可免費查閱. doi:10.1093/mnras/stab1019. 
  9. ^ 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可免費查閱. doi:10.1051/0004-6361/202140707.