V471 Tauri

V471 Tauri

A light curve for V471 Tauri, plotted from TESS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 03h 50m 24.9667s[2]
Declination 17° 14′ 47.431″[2]
Apparent magnitude (V) 9.40 - 9.71[3]
Characteristics
Evolutionary stage K2V + D2[4]
Variable type Algol + RS CVn[3]
Astrometry
Radial velocity (Rv)37.4±0.5[5] km/s
Proper motion (μ) RA: 127.278[2] mas/yr
Dec.: −22.321[2] mas/yr
Parallax (π)21.0129 ± 0.0158 mas[2]
Distance155.2 ± 0.1 ly
(47.59 ± 0.04 pc)
Orbit[6]
Period (P)0.52118 days
Semi-major axis (a)0.01496 AU
Eccentricity (e)0 (assumed)
Inclination (i)80.8°
Details
White dwarf
Mass0.792[6] M☉
Radius0.01134[6] R☉
Luminosity0.145[7] L☉
Surface gravity (log g)8.227[6] cgs
Temperature34,500[7] K
K star
Mass0.852[6] M☉
Radius0.816[6] R☉
Luminosity0.41[8] L☉
Surface gravity (log g)4.49[9] cgs
Temperature5,066[9] K
Metallicity [Fe/H]+0.12[8] dex
Rotation0.5211 days[8]
Rotational velocity (v sin i)89.30[9] km/s
Age625[9] Myr
Other designations
471 Tau, BD+16°516, HIP 17962
Database references
SIMBADdata

V471 Tauri (short V471 Tau) is an eclipsing variable star in the constellation of Taurus. The star has a visual magnitude of 9 which makes it impossible to see with the naked eye. It is around 155 light-years away from the Solar System, in the Hyades star cluster.[6]

Physical properties

The V471 Tauri system has at least two members: a white dwarf star of spectral type D2; and a K-type main sequence star (K2 V), together a post-common envelope binary.[6] There are variations in the timing of the eclipses that were once thought to be due to a third member of the system, proposed to be a brown dwarf, but a direct imaging search for this object with SPHERE resulted in a non-detection.[10] The eclipse variations may be caused by the Applegate mechanism,[11] or the third body may be a pair of smaller brown dwarfs, which would be too faint to have been detected.[7] Later studies have found that the timing variations cannot be explained solely by additional components of the system; even if one or more brown dwarfs are present, the Applegate mechanism must also be a factor.[12]

References

  1. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ a b Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
  4. ^ Hussain, G. A. J.; Allende Prieto, C.; Saar, S. H.; Still, M. (2006). "Spot patterns and differential rotation in the eclipsing pre-cataclysmic variable binary, V471 Tau". Monthly Notices of the Royal Astronomical Society. 367 (4): 1699–1708. arXiv:astro-ph/0602562. Bibcode:2006MNRAS.367.1699H. doi:10.1111/j.1365-2966.2006.10073.x. S2CID 15303415.
  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. (2004). "Kinematics of chromospherically active binaries and evidence of an orbital period decrease in binary evolution". Monthly Notices of the Royal Astronomical Society. 349 (3): 1069–1092. arXiv:astro-ph/0404219. Bibcode:2004MNRAS.349.1069K. doi:10.1111/j.1365-2966.2004.07588.x. S2CID 15290475.
  6. ^ a b c d e f g h Muirhead, Philip S.; Nordhaus, Jason; Drout, Maria R. (2022). "Revised Stellar Parameters for V471 Tau, A Post-common Envelope Binary in the Hyades". The Astronomical Journal. 163 (1): 34. arXiv:2111.06905. Bibcode:2022AJ....163...34M. doi:10.3847/1538-3881/ac390f. S2CID 244116994.
  7. ^ a b c Vaccaro, T. R.; Wilson, R. E.; Van Hamme, W.; Terrell, Dirk (2015). "The V471 Tauri System: A Multi-data-type Probe". The Astrophysical Journal. 810 (2): 157. arXiv:1506.05067. Bibcode:2015ApJ...810..157V. doi:10.1088/0004-637X/810/2/157. S2CID 119256081.
  8. ^ a b c Kővári, Zs; Kriskovics, L.; Oláh, K.; Odert, P.; Leitzinger, M.; Seli, B.; Vida, K.; Borkovits, T.; Carroll, T. (2021). "A confined dynamo: Magnetic activity of the K-dwarf component in the pre-cataclysmic binary system V471 Tauri". Astronomy and Astrophysics. 650: A158. arXiv:2103.02041. Bibcode:2021A&A...650A.158K. doi:10.1051/0004-6361/202140707. S2CID 232105205.
  9. ^ a b c d Zaire, B.; Donati, J. -F.; Klein, B. (2021). "Magnetic field and activity phenomena of the K2 dwarf V471 Tau". Monthly Notices of the Royal Astronomical Society. 504 (2): 1969. arXiv:2104.02619. Bibcode:2021MNRAS.504.1969Z. doi:10.1093/mnras/stab1019.
  10. ^ "The Strange Case of the Missing Dwarf". ESO. 18 February 2015. Retrieved 20 December 2024.
  11. ^ Hardy, A.; Schreiber, M. R.; et al. (February 2015). "The First Science Results from Sphere: Disproving the Predicted Brown Dwarf Around V471 Tau". The Astrophysical Journal Letters. 800 (2): L24. arXiv:1502.05116. Bibcode:2015ApJ...800L..24H. doi:10.1088/2041-8205/800/2/L24.
  12. ^ Kundra, Emil; Hambálek, Ľubomír; et al. (December 2022). "Variability of eclipse timing: the case of V471 Tauri". Monthly Notices of the Royal Astronomical Society. 517 (4): 5358–5367. arXiv:2210.01464. Bibcode:2022MNRAS.517.5358K. doi:10.1093/mnras/stac2812.