Mu Mensae

μ Mensae, Latinized as Mu Mensae, is a solitary,[12] blue-white hued star in the southern constellation of Mensa. With an apparent visual magnitude of 5.54,[2] it is just bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of 6.8405 mas as seen from GAIA, this star is located roughly 477 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.09 due to interstellar dust.[7]

Mu Mensae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Mensa
Right ascension  04h 43m 03.96306s[1]
Declination −70° 55′ 51.7147″[1]
Apparent magnitude (V) 5.54[2]
Characteristics
Spectral type B8 II-III(p Si)[3]
U−B color index −0.46[2]
B−V color index −0.12[2]
Astrometry
Radial velocity (Rv)−0.2±3.9[4] km/s
Proper motion (μ) RA: +9.32[5] mas/yr
Dec.: +34.93[5] mas/yr
Parallax (π)6.8405 ± 0.0750[6] mas
Distance477 ± 5 ly
(146 ± 2 pc)
Absolute magnitude (MV)0.02[7]
Details
Radius3.3[8] R☉
Luminosity216[9] L☉
Temperature12,550[9] K
Rotational velocity (v sin i)30[10] km/s
Age226[7] Myr
Other designations
μ Men, CPD−71° 282, HD 30612, HIP 21949, HR 1541, SAO 256122[11]
Database references
SIMBADdata

The stellar classification of B8 II-III(p Si)[3] suggests that it is a B-type star with a spectrum that shows mixed traits of a giant and a bright giant star. It may be chemically peculiar with an overabundance of silicon in its outer atmosphere.[10] The estimated radius of the star is 3.3 times that of the Sun.[8] It is radiating 216 times the Sun's luminosity from its photosphere at an effective temperature of 12,550 K.[9]

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. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  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. 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.
  5. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  6. 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.
  7. Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035.
  8. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367 (2): 521, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  9. McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  10. Levato, H.; et al. (August 1996), "Radial velocities and axial rotation for a sample of chemically peculiar stars", Astronomy and Astrophysics Supplement, 118: 231–238, Bibcode:1996A&AS..118..231L, doi:10.1051/aas:1996192.
  11. "mu. Men". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-14.
  12. 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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