Eta Volantis

Eta Volantis, Latinized from η Volantis, is a single star[9] in the southern constellation of Volans. It has an apparent visual magnitude of 5.28,[2] which is bright enough to be seen with the naked eye as a dim, white-hued star. Based upon parallax measurements, it is approximately 375 light years from the Sun. The star is moving further away from the Sun with a radial velocity of 20 km/s.

η Volantis
Location of η Volantis.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Volans
Right ascension 08h 22m 04.45154s[1]
Declination −73° 23′ 59.9273″[1]
Apparent magnitude (V) 5.28[2]
Characteristics
Spectral type A0/1 IV/V[3]
B−V color index +0.01[2]
Astrometry
Radial velocity (Rv)+20.0±3.7[4] km/s
Proper motion (μ) RA: −29.412[1] mas/yr
Dec.: +30.007[1] mas/yr
Parallax (π)8.7036 ± 0.1313[1] mas
Distance375 ± 6 ly
(115 ± 2 pc)
Absolute magnitude (MV)0.05[5]
Details
Mass2.73±0.08[5] M☉
Radius3.43[5] R☉
Luminosity84[6] L☉
Surface gravity (log g)3.81±0.04[5] cgs
Temperature8,663[6] K
Rotational velocity (v sin i)214[7] km/s
Age347[5] Myr
Other designations
η Vol, CPD−72°694, FK5 2653, HD 71576, HIP 41003, HR 3334, SAO 256505[8]
Database references
SIMBADdata

This is an A-type star with a stellar classification of A0/1 IV/V,[3] displaying blended spectrum that shows aspects of a main sequence star and a subgiant. The star is an estimated 347[5] and is spinning rapidly with a projected rotational velocity of 214 km/s.[7] It has 2.73 times the mass of the Sun and 3.43 times the Sun's radius.[5] Eta Volantis is radiating 84[6] times the luminosity of the Sun from its photosphere at an effective temperature of 8,663 K.[6]

Eta Volantis has two 12th magnitude optical companions at angular separations of 26.8 and 48.1 arcseconds.[10]

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. Gaia DR2 record for this source at VizieR.
  2. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data.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. Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
  4. Kharchenko, N. V.; et al. (2007), "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations", Astronomische Nachrichten, 328 (9): 889, arXiv:0705.0878, Bibcode:2007AN....328..889K, doi:10.1002/asna.200710776, S2CID 119323941.
  5. Gerbaldi, M.; et al. (June 1999), "Search for reference A0 dwarf stars: Masses and luminosities revisited with HIPPARCOS parallaxes", Astronomy and Astrophysics Supplement, 137 (2): 273–292, Bibcode:1999A&AS..137..273G, doi:10.1051/aas:1999248.
  6. McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. S2CID 118665352.
  7. Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
  8. "* eps Vol". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-09-02.
  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. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
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