Zeta Mensae

Zeta Mensae, Latinized from ζ Mensae, is a solitary,[10] white-hued star in the southern constellation of Mensa. It is faintly visible to the naked eye, having an apparent visual magnitude of +5.64.[2] Based upon an annual parallax shift of 8.2879 mas as seen from GAIA, it is located around 394 light years from the Sun.[6] At that distance, the visual magnitude is diminished by an extinction factor of 0.088 due to interstellar dust.[4] Eggen (1995) listed it as a proper motion candidate for membership in the IC 2391 supercluster.[11]

Zeta Mensae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Mensa
Right ascension  06h 40m 02.89028s[1]
Declination −80° 48′ 48.9399″[1]
Apparent magnitude (V) +5.64[2]
Characteristics
Spectral type A5 III[3][4]
U−B color index +0.15[2]
B−V color index +0.20[2]
Astrometry
Radial velocity (Rv)+7.0±7.4[5] km/s
Proper motion (μ) RA: −4.801[6] mas/yr
Dec.: + 53.158[6] mas/yr
Parallax (π)8.2879 ± 0.0870[6] mas
Distance394 ± 4 ly
(121 ± 1 pc)
Absolute magnitude (MV)+0.09[7]
Details
Luminosity69[8] L☉
Temperature7,555±43[4] K
Rotational velocity (v sin i)200[3] km/s
Other designations
ζ Men, CPD−80° 196, FK5 264, HD 50506, HIP 31897, HR 2559, SAO 258451[9]
Database references
SIMBADdata

The stellar classification of A5 III[3] suggests this is an A-type giant star. It is spinning rapidly, showing a projected rotational velocity of 200 km/s, giving the star an oblate shape with an equatorial bulge that is an estimated 26% larger than the polar radius.[3] The star is radiating about 69[8] times the Sun's luminosity from its photosphere at an effective temperature of around 7,555 K.[4] It displays a faint infrared excess at a wavelength of 18μm, indicating that it is being orbited by a debris disk.[12]

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. 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. Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20: 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2.
  4. Paunzen, E.; et al. (October 2006), "An empirical temperature calibration for the Δ a photometric system. II. The A-type and mid F-type stars", Astronomy and Astrophysics, 458 (1): 293–296, arXiv:astro-ph/0607567, Bibcode:2006A&A...458..293P, doi:10.1051/0004-6361:20064889.
  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. 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.
  7. 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.
  8. 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.
  9. "zet Men". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-15.
  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.
  11. Eggen, Olin J. (December 1995), "Reality Tests of Superclusters in the Young Disk Population", Astronomical Journal, 110: 2862, Bibcode:1995AJ....110.2862E, doi:10.1086/117734.
  12. Ishihara, Daisuke; et al. (May 2017), "Faint warm debris disks around nearby bright stars explored by AKARI and IRSF", Astronomy & Astrophysics, 601: 18, arXiv:1608.04480, Bibcode:2017A&A...601A..72I, doi:10.1051/0004-6361/201526215, A72.
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