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 mas[1] |
| Distance | 450 ± 10 ly (139 ± 3 pc) |
| Absolute magnitude (MV) | −0.85[6] |
| Details | |
| Radius | 52.92+1.01 −0.95[1] R☉ |
| Luminosity | 602.0±16.9[1] L☉ |
| Temperature | 3,930+36 −37[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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
[edit]- ^ a b c d e f g h i j 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.
- ^ a b 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.
- ^ a b Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
- ^ a b 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, S2CID 59451347, A61.
- ^ 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.
- ^ "* mu. Mus". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-14.
{{cite web}}: CS1 maint: postscript (link) - ^ 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, S2CID 14878976.
- ^ 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.
- ^ BSJ (October 31, 2011), "Mu Muscae", AAVSO Website, American Association of Variable Star Observers, retrieved 2017-03-15.
