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) | ±7.4 +7.0[5] km/s |
Proper motion (μ) | RA: −4.97[1] mas/yr Dec.: +52.73[1] mas/yr |
Parallax (π) | 7.88 ± 0.18[1] mas |
Distance | 414 ± 9 ly (127 ± 3 pc) |
Absolute magnitude (MV) | +0.09[6] |
Details | |
Luminosity | 69[7] L☉ |
Temperature | ±43 7,555[4] K |
Rotational velocity (v sin i) | 200[3] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Zeta Mensae, Latinized from ζ Mensae, is a solitary,[9] 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 7.88 mas as seen from Earth,[1] it is located around 414 light years from the Sun. 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.[10]
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[7] 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.[11]
References
- 1 2 3 4 5 6 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.
- 1 2 3 4 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.
- 1 2 3 4 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.
- 1 2 3 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.
- ↑ 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.
- ↑ 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.
- 1 2 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.
- ↑ "zet Men". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-15.
- ↑ 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.
- ↑ 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.
- ↑ 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.