Epsilon Pavonis

ε Pavonis
Location of ε Pavonis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pavo
Right ascension 20h 00m 35.55558s[1]
Declination −72° 54′ 37.8198″[1]
Apparent magnitude (V) 3.97[2]
Characteristics
Spectral type A0 Va[2]
U−B color index −0.05[3]
B−V color index −0.03[2]
Astrometry
Radial velocity (Rv)−6.7±0.7[4] km/s
Proper motion (μ) RA: +81.78[1] mas/yr
Dec.: −132.16[1] mas/yr
Parallax (π)31.04 ± 0.17 mas[1]
Distance105.1 ± 0.6 ly
(32.2 ± 0.2 pc)
Absolute magnitude (MV)1.43[2]
Details
Mass2.2[5] M☉
Radius1.74[6] R☉
Luminosity32[7] L☉
Surface gravity (log g)4.32±0.02[6] cgs
Temperature10,440[8] K
Rotational velocity (v sin i)85[7] km/s
Age27[6] Myr
Other designations
ε Pav, CPD−73° 2086, FK5 748, GC 27631, HD 188228, HIP 98495, HR 7590, SAO 257757
Database references
SIMBADdata

Epsilon Pavonis, Latinized from ε Pavonis, is a single,[9] white-hued star in the constellation Pavo. It can be viewed with the naked eye, having an apparent visual magnitude of 3.97.[2] The annual parallax shift of 31.04[1] mas provides a distance estimate of 105 light years from the Sun. This star is a member of the proposed Argus Association, a young moving group of more than 60 stars associated with the IC 2391 cluster.[10] Epsilon Pavonis is moving closer to the Sun with a radial velocity of −6.7 km/s.[4]

With a stellar classification of A0 Va,[2] Epsilon Pavonis is an ordinary A-type main-sequence star that is generating energy through hydrogen fusion at its core. It is just 27[6] million years old with a projected rotational velocity of 85[7] km/s. The star has 2.2[5] times the mass of the Sun and 1.74[6] the Sun's radius. It is radiating 32[7] times the Sun's luminosity from its photosphere at an effective temperature of 10,440 K.[8]

  1. ^ a b c d e f 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. S2CID 18759600. Vizier catalog entry
  2. ^ a b c d e f 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. Vizier catalog entry
  3. ^ Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M.Vizier catalog entry
  4. ^ a b 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. S2CID 119231169.
  5. ^ a b Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID 118629873. Vizier catalog entry
  6. ^ a b c d e 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.
  7. ^ a b c d Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. S2CID 55586789. Vizier catalog entry
  8. ^ a b 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. Vizier catalog entry
  9. ^ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  10. ^ Zuckerman, B.; et al. (May 2011). "The Tucana/Horologium, Columba, AB Doradus, and Argus Associations: New Members and Dusty Debris Disks". The Astrophysical Journal. 732 (2): 19. arXiv:1104.0284. Bibcode:2011ApJ...732...61Z. doi:10.1088/0004-637X/732/2/61. S2CID 62797470. 61.