Mu Muscae

Mu Muscae, Latinized from μ Muscae, is a solitary[8] star in the southern constellation of Musca. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of around 4.75.[4] Based upon an annual parallax shift of 7.21 mas as seen from Earth, it is located about 450 light years from the Sun. The star is drifting further away with a radial velocity of +37 km/s.[5]

Mu Muscae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Musca
Right ascension 11h 48m 14.53282s[1]
Declination −66° 48′ 53.6712″[1]
Apparent magnitude (V) 4.6 - 4.8[2]
Characteristics
Spectral type K4 III[3]
U−B color index +1.89[4]
B−V color index +1.54[4]
Variable type Lb[2]
Astrometry
Radial velocity (Rv)+37.4±2.8[5] km/s
Proper motion (μ) RA: −31.223[1] mas/yr
Dec.: −15.938[1] mas/yr
Parallax (π)7.2113 ± 0.1762[1] mas
Distance450 ± 10 ly
(139 ± 3 pc)
Absolute magnitude (MV)−0.85[6]
Details
Radius52.92+1.01
−0.95[1] R☉
Luminosity602.0±16.9[1] L☉
Temperature3,930+36
−37[1] K
Other designations
μ Mus, CD−66° 1114, HD 102584, HIP 57581, HR 4530, SAO 251597[7]
Database references
SIMBADdata

This is an evolved K-type giant star with a stellar classification of K4 III,[3] having exhausted the supply of hydrogen at its core then cooled and expanded to 53[1] times the Sun's radius. It most likely on the red giant branch, rather than the asymptotic giant branch, and shows no signs of mass loss. Mu Muscae is a type Lb, oxygen-rich irregular variable with a small amplitude[9] that ranges in visual magnitude between 4.71 and 4.76.[10] It is radiating 602 times the luminosity of the Sun from its photosphere at an effective temperature of 3,930 K.[1]

References
  1. 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.
  2. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  3. Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
  5. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  6. 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.
  7. "* mu. Mus". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-14.
  8. 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.
  9. Kerschbaum, F. (November 1999), "Irregular variables of type Lb. Energy distributions and stellar parameters", Astronomy and Astrophysics, 351: 627–634, Bibcode:1999A&A...351..627K.
  10. BSJ (October 31, 2011), "Mu Muscae", AAVSO Website, American Association of Variable Star Observers, retrieved 2017-03-15.
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