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Epsilon Phoenicis

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ε Phoenicis
Location of ε Phoenicis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Phoenix
Right ascension 00h 09m 24.640s[1]
Declination −45° 44′ 50.73″[1]
Apparent magnitude (V) 3.87[2]
Characteristics
Evolutionary stage Red clump[3]
Spectral type K0III[4]
U−B color index +0.84[2]
B−V color index +1.02[2]
Astrometry
Radial velocity (Rv)−9.20[5] km/s
Proper motion (μ) RA: +120.393 mas/yr[1]
Dec.: −179.597 mas/yr[1]
Parallax (π)22.6081 ± 0.1481 mas[1]
Distance144.3 ± 0.9 ly
(44.2 ± 0.3 pc)
Absolute magnitude (MV)0.65[6]
Details
Luminosity67.21[6] L
Temperature4,862±42[7] K
Metallicity [Fe/H]+0.00±0.08[7] dex
Rotational velocity (v sin i)< 1.5[8] km/s
Other designations
FK5 3, GC 158, HD 496, HIP 765, HR 25, SAO 214983[9]
Database references
SIMBADdata

Epsilon Phoenicis is a star in the southern constellation of Phoenix. It is visible to the naked eye with an apparent visual magnitude of 3.87.[2] The distance to this star is approximately 144 light years based on parallax measurements, but it is drifting closer with a heliocentric radial velocity of −9.2 km/s.[5]

This is an evolved giant star with a stellar classification of K0III,[4] a star that has used up its core hydrogen and has expanded. It is a red clump star, indicating that it has undergone helium flash and is currently on the core helium-fusing horizontal branch.[3] Epsilon Phoenicis is radiating 67[6] times the luminosity of the Sun from its photosphere at an effective temperature of 4,862 K.[7] Based on the elemental abundance of iron in the stellar atmosphere, the metallicity of Epsilon Phoenicis is similar to that of the Sun.[7]

References

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  1. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. ^ a b Laney, C. D.; et al. (2012), "A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars", Monthly Notices of the Royal Astronomical Society, 419 (2): 1637, arXiv:1109.4800, Bibcode:2012MNRAS.419.1637L, doi:10.1111/j.1365-2966.2011.19826.x, S2CID 117788450.
  4. ^ a b Houk, N. (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 2. Dept. of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
  5. ^ 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.
  6. ^ a b c 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
  7. ^ a b c d Soubiran, C.; et al. (July 1, 2022). "Assessment of [Fe/H] determinations for FGK stars in spectroscopic surveys". Astronomy and Astrophysics. 663: A4. arXiv:2112.07545. Bibcode:2022A&A...663A...4S. doi:10.1051/0004-6361/202142409. ISSN 0004-6361.
  8. ^ 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. S2CID 54046583. Vizier catalog entry
  9. ^ "eps Phe". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-11-07.