Zeta Mensae
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 8.2879 mas as seen from GAIA, it is located around 394 light years from the Sun.[1] 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]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Mensa |
| Right ascension | 06h 40m 02.89197s[1] |
| Declination | −80° 48′ 48.9391″[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[1] mas/yr Dec.: +53.158[1] mas/yr |
| Parallax (π) | 8.2879 ± 0.0870 mas[1] |
| Distance | 394 ± 4 ly (121 ± 1 pc) |
| Absolute magnitude (MV) | +0.09[6] |
| Details | |
| Radius | 4.65±0.27[1] R☉ |
| Luminosity | 66.39±0.86[1] L☉ |
| Temperature | 7,555±43[4] K |
| Rotational velocity (v sin i) | 200[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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,[7] 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[11] 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 Edit
- ^ a b c d e f g h 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 c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
- ^ a b c Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.
- ^ a b c d 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, S2CID 18219735.
- ^ 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.
- ^ a b Levato, O. H. (August 1972). "Rotational Velocities and Spectral Types of Some A-Type Stars". Publications of the Astronomical Society of the Pacific. 84 (500): 584. Bibcode:1972PASP...84..584L. doi:10.1086/129336. eISSN 1538-3873. ISSN 0004-6280.
- ^ "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, S2CID 14878976.
- ^ 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.
- ^ 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, S2CID 118665352.
- ^ 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, S2CID 55234482, A72.