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.
  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. Cite journal requires |journal= (help)
  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.
  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. 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.
  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, 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.
  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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