Mu Phoenicis

μ Phoenicis, Latinized as Mu Phoenicis, is a suspected astrometric binary[10] star system in the southern constellation of Phoenix. It is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 4.59.[2] This system is located approximately 246 light years distant from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +17.4 km/s.[4]

Mu Phoenicis
Location of μ Phoenicis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Phoenix
Right ascension  00h 41m 19.55229s[1]
Declination −46° 05′ 06.0184″[1]
Apparent magnitude (V) 4.59[2]
Characteristics
Spectral type G8III[3]
U−B color index +0.72[2]
B−V color index +0.97[2]
Astrometry
Radial velocity (Rv)+17.41±0.16[4] km/s
Proper motion (μ) RA: −28.20[1] mas/yr
Dec.: +1.80[1] mas/yr
Parallax (π)13.27 ± 0.23[1] mas
Distance246 ± 4 ly
(75 ± 1 pc)
Absolute magnitude (MV)0.21[5]
Details
Mass2.50[6] M☉
Radius13.15+2.59
−2.28[4] R☉
Luminosity96.6±2.4[4] L☉
Temperature4,900[7] K
Rotational velocity (v sin i)1.4[8] km/s
Age1.4[6] Gyr
Other designations
μ Phe, CD−46°180, FK5 1015, GC 823, HD 3919, HIP 3245, HR 180, SAO 215194[9]
Database references
SIMBADdata

The visible component is an aging G-type giant star with a stellar classification of G8III.[3] Having exhausted the supply of hydrogen at its core, this star cooled and expanded off the main sequence. At present it has 13[4] times the girth of the Sun. It is 1.4[6] billion years old with 2.5[6] times the mass of the Sun. It is radiating 97[4] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,900 K.[7]

References
  1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 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. Houk, Nancy (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". 2. Ann Arbor: Dept. of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H. Cite journal requires |journal= (help)
  4. 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.
  5. 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
  6. Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88.
  7. Gontcharov, G. A. (2009). "Red giant clump in the Tycho-2 catalogue". Astronomy Letters. 34 (11): 785. arXiv:1607.00619. Bibcode:2008AstL...34..785G. doi:10.1134/S1063773708110078. Vizier catalog entry
  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. Vizier catalog entry
  9. "mu Phe". SIMBAD. Centre de données astronomiques de Strasbourg.
  10. 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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