Mu Fornacis

μ Fornacis (Latinised as Mu Fornacis) is the Bayer designation for a star in the southern constellation of Fornax. With an apparent visual magnitude of 5.27,[2] it is visible to the naked eye. The distance to this star, as determined by its annual parallax shift of 10.18 mas,[1] is around 320 light years.

Mu Fornacis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Fornax
Right ascension  02h 12m 54.46962s[1]
Declination −30° 43′ 25.7732″[1]
Apparent magnitude (V) 5.27[2]
Characteristics
Spectral type A0 V[3]
U−B color index −0.06[2]
B−V color index −0.02[2]
Astrometry
Radial velocity (Rv)10.0±3.7[4] km/s
Proper motion (μ) RA: +14.10[1] mas/yr
Dec.: +6.85[1] mas/yr
Parallax (π)10.18 ± 0.24[1] mas
Distance320 ± 8 ly
(98 ± 2 pc)
Absolute magnitude (MV)+0.31[5]
Details
Mass3.10[6] M☉
Radius2.5[7] R☉
Luminosity68.7[8] L☉
Surface gravity (log g)3.71±0.14[6] cgs
Temperature11,745±399[6] K
Rotational velocity (v sin i)320[3] km/s
Age188[6] Myr
Other designations
μ For, CD−31° 882, FK5 78, GJ 89, HD 13709, HIP 10320, HR 652, SAO 193573.[9]
Database references
SIMBADdata

This is an A-type main sequence star with a stellar classification of A0 V.[3] It is a Be star that displays "central quasi emission" (CQE) bumps in its spectrum due to a surrounding shell of material.[10] The star has an estimated 3.1[6] times the mass of the Sun and 2.5[7] times the Sun's radius. Mu Fornacis is spinning rapidly with a projected rotational velocity of 320 km/s[3] and is around 188 million years old.[6] It radiates 68.7[8] times the solar luminosity from its outer atmosphere at an effective temperature of 11,745 K.[6]

Mu Fornacis appears to be emitting an infrared excess at a wavelength of 22 μm, which could be due to an orbiting debris disk.[11]

References
  1. 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.
  2. Cousins, A. W. J. (1973), "UBV photometry of some southern stars", Monthly Notes of the Astronomical Society of Southern Africa, 32: 11, Bibcode:1973MNSSA..32...11C.
  3. Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224.
  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. 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.
  6. David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  7. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) – Third edition – Comments and statistics", Astronomy and Astrophysics, 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  8. McDonald, I.; et al. (November 2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  9. "mu. For – Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-01-24.
  10. Rivinius, Th.; et al. (November 2006), "Bright Be-shell stars", Astronomy and Astrophysics, 459 (1): 137–145, Bibcode:2006A&A...459..137R, doi:10.1051/0004-6361:20053008
  11. Wu, Chao-Jian; et al. (October 2013), "Bright 22 μm Excess Candidates from the Wise All-sky Catalog and the Hipparcos Main Catalog", The Astrophysical Journal Supplement, 208 (2): 12, arXiv:1308.3848, Bibcode:2013ApJS..208...29W, doi:10.1088/0067-0049/208/2/29, 29.
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