V471 Tauri

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V471 Tauri
V471TauLightCurve.png
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]
Distance 155.2 ± 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
Mass 0.792 [6]   M☉
Radius 0.01134 [6]   R☉
Luminosity 0.145 [7]   L☉
Surface gravity (log g)8.227 [6]   cgs
Temperature 34,500 [7]   K
K star
Mass 0.852 [6]   M☉
Radius 0.816 [6]   R☉
Luminosity0.41 [8]   L☉
Surface gravity (log g)4.49 [9]   cgs
Temperature 5,066 [9]   K
Metallicity [Fe/H]+0.12 [8]   dex
Rotation 0.5211 days [8]
Rotational velocity (v sin i)89.30 [9]  km/s
Age 625 [9]   Myr
Other designations
471 Tau, BD+16°516, HIP 17962
Database references
SIMBAD data

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]

In 1970, Burt Nelson and Arthur Young announced that the star is a variable star. [10] It was given its variable star designation in 1972.

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] [11] 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. [12] The eclipse variations may be caused by the Applegate mechanism, [13] 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. [14]

References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. 1 2 3 4 5 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. 1 2 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. 1 2 3 4 5 6 7 8 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. 1 2 3 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. 1 2 3 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. 1 2 3 4 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. ↑ Nelson, Burt; Young, Arthur (June 1970). "A New Eclipsing Binary Containing a Very Hot White Dwarf". Publications of the Astronomical Society of the Pacific. 82 (487): 699–706. Bibcode:1970PASP...82..699N. doi:10.1086/128946 . Retrieved 4 September 2025.
  11. ↑ Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (September 1972). "58th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 717: 1–36. Bibcode:1972IBVS..717....1K . Retrieved 4 September 2025.
  12. ↑ "The Strange Case of the Missing Dwarf". ESO. 18 February 2015. Retrieved 20 December 2024.
  13. ↑ 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.
  14. ↑ 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 .
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