Eta Pavonis

Eta Pavonis, a name latinized from η Pavonis, is a single[11] star in the southern constellation of Pavo, positioned near the western constellation border next to Ara. It has an orange hue and is visible to the naked eye with an apparent visual magnitude of 3.61.[2] Based on parallax, this object is located at a distance of approximately 350 light-years (108 pc) from the Sun.[1] It has an absolute magnitude of −1.56,[2] and is drifting closer with a radial velocity of −7.6 km/s.[5]

η Pavonis
Location of η Pavonis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pavo
Right ascension  17h 45m 43.98605s[1]
Declination −64° 43′ 25.9394″[1]
Apparent magnitude (V) 3.61[2]
Characteristics
Spectral type K2II[3]
U−B color index +1.17[4]
B−V color index +1.19[4]
Astrometry
Radial velocity (Rv)−7.60[5] km/s
Proper motion (μ) RA: −11.96[1] mas/yr
Dec.: −56.57[1] mas/yr
Parallax (π)9.26 ± 0.18[1] mas
Distance352 ± 7 ly
(108 ± 2 pc)
Absolute magnitude (MV)−1.56[2]
Details
Mass3.98[6] M☉
Radius33.49+8.17
−4.57[7] R☉
Luminosity469±20[7] L☉
Surface gravity (log g)1.97[8] cgs
Temperature4,642+354
−480[7] K
Metallicity [Fe/H]+0.15[8] dex
Rotational velocity (v sin i)< 1.5[9] km/s
Other designations
η Pav, CPD−64°3662, FK5 661, GC 254020, HD 160635, HIP 86929, HR 6582, SAO 245369[10]
Database references
SIMBADdata

This is an evolved bright giant star with a stellar classification K2II,[3] between the classifications of giant and supergiant. Having exhausted the supply of hydrogen at its core, it has expanded to around 33.5 times the radius of the Sun.[7] The star is radiating 469[7] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,642 K.[7]

References
  1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  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. Vizier catalog entry
  3. Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. 1. Department of Astronomy, University of Michigan. pp. 19 + 452. Bibcode:1975mcts.book.....H.
  4. Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  5. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  6. Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy and Astrophysics. 633: A34. arXiv:1910.12732. Bibcode:2020A&A...633A..34C. doi:10.1051/0004-6361/201936360.
  7. 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.
  8. Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147 (6): 137. Bibcode:2014AJ....147..137L. doi:10.1088/0004-6256/147/6/137.
  9. De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. Vizier catalog entry
  10. "eta Pav". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-05-20.
  11. 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.
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