Astronomy:Epsilon Phoenicis
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas/yr Dec.: −179.597[1] mas/yr |
| Parallax (π) | 22.6081 ± 0.1481[1] mas |
| Distance | 144.3 ± 0.9 ly (44.2 ± 0.3 pc) |
| Absolute magnitude (MV) | 0.65[6] |
| Details[7] | |
| Mass | 1.93±0.23 M☉ |
| Radius | 10.03±0.22 R☉ |
| Luminosity | 50.4±1.5 L☉ |
| Surface gravity (log g) | 2.560±0.103 cgs |
| Temperature | 4,862±42[8] K |
| Metallicity [Fe/H] | +0.00±0.08[8] dex |
| Rotational velocity (v sin i) | < 1.5[9] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 passed the red-giant branch, undergone a helium flash and is currently on the core helium-fusing horizontal branch.[3] Epsilon Phoenicis is about two times more massive than the Sun, and expanded to ten times its radius. It radiates 50 the luminosity of the Sun from its photosphere[7] at an effective temperature of 4,862 K. Based on the elemental abundance of iron in the stellar atmosphere, the metallicity of Epsilon Phoenicis is similar to that of the Sun.[8]
References
- ↑ 1.0 1.1 1.2 1.3 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 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.
- ↑ 3.0 3.1 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, doi:10.1111/j.1365-2966.2011.19826.x, Bibcode: 2012MNRAS.419.1637L.
- ↑ 4.0 4.1 Houk, N. (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. 2. Dept. of Astronomy, University of Michigan. Bibcode: 1978mcts.book.....H.
- ↑ 5.0 5.1 Gontcharov, G. A. (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. Bibcode: 2006AstL...32..759G.
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. Vizier catalog entry
- ↑ 7.0 7.1 Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V. et al. (2022-01-01). "CORALIE radial-velocity search for companions around evolved stars (CASCADES). I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy and Astrophysics 657: A87. doi:10.1051/0004-6361/202040078. ISSN 0004-6361. Bibcode: 2022A&A...657A..87O. Epsilon Phoenicis' database entry at VizieR.
- ↑ 8.0 8.1 8.2 Soubiran, C. et al. (July 1, 2022). "Assessment of [Fe/H] determinations for FGK stars in spectroscopic surveys". Astronomy and Astrophysics 663: A4. doi:10.1051/0004-6361/202142409. ISSN 0004-6361. Bibcode: 2022A&A...663A...4S.
- ↑ 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. doi:10.1051/0004-6361/201220762. Bibcode: 2014A&A...561A.126D. Vizier catalog entry
- ↑ "eps Phe". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=eps+Phe.
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