24 Lyncis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 mas[1] |
| 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
[edit]- ^ a b c d e f g 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, S2CID 18759600.
- ^ a b c d e f g 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 Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
- ^ a b c d e f g 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, S2CID 33401607.
- ^ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b c Zorec, J.; et al. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ "24 Lyn". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-06.
- ^ 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.
- ^ van Belle, Gerard T. (March 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.
- ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
