Astronomy:HD 66920

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Short description: Star in the constellation Volans
HD 66920
Observation data
Equinox J2000.0]] (ICRS)
Constellation Volans
Right ascension  07h 59m 15.7648s[1]
Declination −73° 14′ 39.0155″[1]
Apparent magnitude (V) 6.33±0.01[2]
Characteristics
Evolutionary stage main sequence[1]
Spectral type A3 V[3]
U−B color index +0.13[4]
B−V color index +0.14[4]
Astrometry
Radial velocity (Rv)23.8±1.7[5] km/s
Proper motion (μ) RA: −5.984[1] mas/yr
Dec.: −20.295[1] mas/yr
Parallax (π)7.6204 ± 0.0251[1] mas
Distance428 ± 1 ly
(131.2 ± 0.4 pc)
Absolute magnitude (MV)+0.76[6]
Details
Mass2.33[7] M☉
Radius3.53+0.13
−0.11[8] R☉
Luminosity42±2[9] L☉
Surface gravity (log g)3.65±0.08[8] cgs
Temperature8,247±95[10] K
Metallicity [Fe/H]−0.01[11] dex
Age711[1] Myr
Other designations
CD−72°431, CPD−72°654, GC 10898, HD 66920, HIP 39041, HR 3171, SAO 256463[12]
Database references
SIMBADdata

HD 66920, also known as HR 3171, is a solitary, white hued star located in the southern circumpolar constellation Volans, the flying fish. It has an apparent magnitude of 6.33,[2] placing it near the limit for naked eye visibility. Based on parallax measurements from the Gaia spacecraft, the star is estimated to be 428 light years distant.[1] It appears to be receding from the Solar System, having a heliocentric radial velocity of 23.8 km/s.[5] Pauzen et al. (2001) listed it as a λ Boötis star,[3] but is now considered a non member.[13]

HD 66920 has a classification of A3 V,[3] indicating that it is an ordinary A-type main-sequence star. Although it has been classified as a giant star (III),[14] HR 3171 is still on the main sequence[1] (according to Gaia DR3 models). It has 2.33 times the mass of the Sun and an enlarged radius of 3.53 R☉.[8] It radiates 42 times the luminosity of the Sun[9] from its enlarged photosphere at an effective temperature of 8,247 K.[10] HD 66920 has a solar metallicity,[11] and is estimated to be 711 million years old.[1]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (1 March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 3.2 Paunzen, E.; Duffee, B.; Heiter, U.; Kuschnig, R.; Weiss, W. W. (July 2001). "A spectroscopic survey for λ Bootis stars". Astronomy & Astrophysics 373 (2): 625–632. doi:10.1051/0004-6361:20010630. ISSN 0004-6361. Bibcode: 2001A&A...373..625P. 
  4. ↑ 4.0 4.1 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99–110. Bibcode: 1966CoLPL...4...99J. 
  5. ↑ 5.0 5.1 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  6. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  7. ↑ Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K. 
  8. ↑ 8.0 8.1 8.2 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  9. ↑ 9.0 9.1 Murphy, Simon J.; Paunzen, Ernst (5 December 2016). "Gaia's view of the λ Boo star puzzle". Monthly Notices of the Royal Astronomical Society 466 (1): 546–555. doi:10.1093/mnras/stw3141. ISSN 0035-8711. Bibcode: 2017MNRAS.466..546M. 
  10. ↑ 10.0 10.1 Paunzen, E.; Schnell, A.; Maitzen, H. M. (October 2006). "An empirical temperature calibration for the Δa photometric system II: The A-type and mid F-type stars". Astronomy & Astrophysics 458 (1): 293–296. doi:10.1051/0004-6361:20064889. ISSN 0004-6361. Bibcode: 2006A&A...458..293P. 
  11. ↑ 11.0 11.1 Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. ISSN 0320-0108. Bibcode: 2012AstL...38..771G. 
  12. ↑ "HD 66920". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+66920. 
  13. ↑ Murphy, Simon J.; Corbally, Christopher J.; Gray, Richard O.; Cheng, Kwang-Ping; Neff, James E.; Koen, Chris; Kuehn, Charles A.; Newsome, Ian et al. (2015). "An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue". Publications of the Astronomical Society of Australia 32. doi:10.1017/pasa.2015.34. ISSN 1323-3580. Bibcode: 2015PASA...32...36M. 
  14. ↑ Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53°. Bibcode: 1975mcts.book.....H. 
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