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71 Tauri

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71 Tauri
Location of 71 Tauri (circled in red)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Right ascension 04h 26m 20.77082s[1]
Declination +15° 37′ 05.8841″[1]
Apparent magnitude (V) +4.48[2]
Characteristics
Evolutionary stage main sequence[1]
Spectral type F0 V[3]
U−B color index +0.13[2]
B−V color index +0.25[2]
Variable type δ Sct[4]
Astrometry
Radial velocity (Rv)+38.3[5] km/s
Proper motion (μ) RA: +87.435[1] mas/yr
Dec.: −20.978[1] mas/yr
Parallax (π)21.3957±0.2511 mas[1]
Distance152 ± 2 ly
(46.7 ± 0.5 pc)
Absolute magnitude (MV)1.10[6]
Details
Mass1.94[6] M☉
Radius3.34[3] R☉
Surface gravity (log g)3.73[7] cgs
Temperature7,543[3] K
Rotation14.2[6] d
Rotational velocity (v sin i)192[6] km/s
Age966[7] Myr
Other designations
71 Tau, V777 Tau, BD+15°625, GC 5375, HD 28052, HIP 20713, HR 1394, SAO 93932[8]
Database references
SIMBADdata

71 Tauri is a suspected triple star[9] system in the zodiac constellation Taurus, located 152 light years from the Sun.[1] It is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of +4.48.[2] The star is moving further away from the Earth with a heliocentric radial velocity of +38 km/s.[5] It is a member of the Hyades open cluster.[10]

A light curve for V777 Tauri, plotted from TESS data[11]

The primary component is an F-type main-sequence star with a stellar classification of F0 V.[3] In 1979, Stephen Horan discovered that 71 Tauri is a variable star.[12] It was given its variable star designation, V777 Tauri, in 1981.[13] It is a Delta Scuti variable with an amplitude of 0.02 in magnitude and a frequency of 0.16 d−1.[4] This star has about 1.94[6] times the mass of the Sun and 3.34[3] times the Sun's radius. It has a projected rotational velocity of 192 km s−1, for an estimated rotation period of 14.2 days.[6] Extreme ultraviolet flares have been observed coming from this star's hot corona,[3] and it is the second brightest X-ray source in the Hyades.[10]

References

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  1. ^ a b c d e f g 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.
  2. ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M.
  3. ^ a b c d e f Mullan, D. J.; Mathioudakis, M. (November 2000), "Extreme-Ultraviolet Flares in an F2 Star", The Astrophysical Journal, 544 (1): 475–480, Bibcode:2000ApJ...544..475M, doi:10.1086/317202.
  4. ^ 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.
  5. ^ a b Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick (eds.), "The Revision of the General Catalogue of Radial Velocities", Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E.
  6. ^ a b c d e f Pizzolato, N.; Maggio, A.; Sciortino, S. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", Astronomy and Astrophysics, 361: 614–628, Bibcode:2000A&A...361..614P.
  7. ^ a b David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  8. ^ "71 Tau -- Variable Star of delta Sct type", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2007-01-25
  9. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  10. ^ a b Simon, Theodore; Ayres, Thomas R. (August 2000), "71 Tauri: Hyades Enigma Resolved?", The Astrophysical Journal, 539 (1): 325–330, Bibcode:2000ApJ...539..325S, doi:10.1086/309228.
  11. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  12. ^ Horan, S. (November 1979). "A photometric survey of the Hyades for delta Scuti variables". Astronomical Journal. 84: 1770–1774. Bibcode:1979AJ.....84.1770H. doi:10.1086/112607.
  13. ^ Kholopov, P. N.; Samus, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (February 1981). "65th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 1921: 1–21. Bibcode:1981IBVS.1921....1K. Retrieved 3 September 2025.