TU Corvi

TU Corvi is a yellow-white hued star in the southern constellation of Corvus. It is a dimly visible to the naked eye with an apparent visual magnitude of 6.20.[2] The distance to this star can be estimated from its annual parallax shift of 13.59 mas,[1] yielding a range of about 240 light years. Based upon measured changes in its proper motion, it may be a close binary system.[11]

TU Corvi
Observation data
Epoch J2000      Equinox J2000
Constellation Corvus
Right ascension 12h 35m 58.79334s[1]
Declination −20° 31′ 38.9233″[1]
Apparent magnitude (V) 6.20[2]
Characteristics
Spectral type F0 V[3]
B−V color index 0.34±0.01[2]
Variable type δ Sct[4][5]
Astrometry
Radial velocity (Rv)−2.0±4.3[6] km/s
Proper motion (μ) RA: +32.752[1] mas/yr
Dec.: -52.767[1] mas/yr
Parallax (π)13.5866 ± 0.3271[1] mas
Distance240 ± 6 ly
(74 ± 2 pc)
Absolute magnitude (MV)2.08[2]
Details
Mass1.45[7] M☉
Luminosity12.6+1.2
−1.1[7] L☉
Surface gravity (log g)3.93±0.14[7] cgs
Temperature7,132±242[7] K
Metallicity [Fe/H]−0.07±0.07[8] dex
Rotational velocity (v sin i)103[9] km/s
Age786[7] Myr
Other designations
TU Crv, BD−19°3521, HD 109585, HIP 61496, HR 4797, SAO 180937[10]
Database references
SIMBADdata

This is an F-type main-sequence star with a stellar classification of F0 V.[3] Previously it had been classed as F0 III,[12] matching an evolved giant star. It is a Delta Scuti variable, varying by an amplitude of 0.025 in B magnitude with a period of 118 minutes.[4][5] At the age of 786[7] million years, it has a high rate of spin with a projected rotational velocity of 103 km/s.[9] The star has 1.45 times the mass of the Sun and is radiating 12.6 times the Sun's luminosity from its photosphere at an effective temperature of 7,132 K.[7]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  3. Houk, Nancy; Smith-Moore, M. (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. 4. Ann Arbor: Dept. of Astronomy, University of Michigan. Bibcode:1988mcts.book.....H.
  4. Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
  5. Watson, Christopher (4 January 2010). "TU Corvi". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 21 July 2015.
  6. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012). "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project". Astronomy & Astrophysics. 546: 14. arXiv:1208.3048. Bibcode:2012A&A...546A..61D. doi:10.1051/0004-6361/201219219. S2CID 59451347. A61.
  7. 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. Gáspár, András; et al. (August 2016), "The Correlation between Metallicity and Debris Disk Mass", The Astrophysical Journal, 826 (2): 14, arXiv:1604.07403, Bibcode:2016ApJ...826..171G, doi:10.3847/0004-637X/826/2/171, S2CID 119241004, 171
  9. Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. S2CID 55586789.
  10. "TU Crv". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 August 2018.
  11. Mason, Brian D.; et al. (1999). "Speckle Interferometry of New and Problem HIPPARCOS Binaries". The Astronomical Journal. 117 (4): 1890. Bibcode:1999AJ....117.1890M. doi:10.1086/300823.
  12. Cowley, A.; et al. (April 1969). "A study of the bright A stars. I. A catalogue of spectral classifications". Astronomical Journal. 74: 375–406. Bibcode:1969AJ.....74..375C. doi:10.1086/110819.
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