Astronomy:24 Lyncis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lynx |
| Right ascension | 07h 43m 00.41551s[1] |
| Declination | +58° 42′ 37.2950″[1] |
| Apparent magnitude (V) | 4.93[2] |
| Characteristics | |
| Spectral type | A3 IVn[3] |
| B−V color index | +0.104±0.015[2] |
| Astrometry | |
| Radial velocity (Rv) | +9.4±2.3[2] km/s |
| Proper motion (μ) | RA: −37.50[1] mas/yr Dec.: −52.29[1] mas/yr |
| Parallax (π) | 12.22 ± 0.20[1] mas |
| Distance | 267 ± 4 ly (82 ± 1 pc) |
| Absolute magnitude (MV) | 0.37[2] |
| Details | |
| Mass | 1.89[4] M☉ |
| Radius | 1.7[5] R☉ |
| Luminosity | 60.81[2] L☉ |
| Surface gravity (log g) | 3.25[4] cgs |
| Temperature | 8,786±299[4] K |
| Rotational velocity (v sin i) | 233[6] km/s |
| Age | 262[4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
24 Lyncis is a single[8] star in the northern constellation of Lynx. It is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 4.96.[1] The distance to this star, as determined from its parallax measurements, is around 274 light years.[1] It is moving further away from the Earth with a heliocentric radial velocity of about +9 km/s.[2]
This object has a stellar classification of A3 IVn,[3] matching an A-type star with a subgiant luminosity class. The 'n' suffix indicates "nebulous" absorption lines due to rapid rotation. The star is spinning with a projected rotational velocity of 233 km/s,[6] giving it an equatorial bulge that is 17% larger than the polar radius.[9] Zorec et al. (2012) estimate the star is actually 88% of the way through its main sequence lifetime.[6] It is 262[4] million years old with 1.89[4] times the mass of the Sun. 24 Lyncis is radiating 61[2] times the luminosity of the Sun from its photosphere at an effective temperature of 8,786 K.[4]
There is a magnitude 11.15 visual companion at an angular separation of 55″ along a position angle of 324°, as of 2010.[10]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 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, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367 (2): 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 6.0 6.1 6.2 Zorec, J. et al. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ "24 Lyn". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=24+Lyn.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review 20 (1): 51, doi:10.1007/s00159-012-0051-2, Bibcode: 2012A&ARv..20...51V.
- ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M.
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