24 Lyncis

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]

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[1] mas
Distance267 ± 4 ly
(82 ± 1 pc)
Absolute magnitude (MV)0.37[2]
Details
Mass1.89[4] M☉
Radius1.7[5] R☉
Luminosity60.81[2] L☉
Surface gravity (log g)3.25[4] cgs
Temperature8,786±299[4] K
Rotational velocity (v sin i)233[6] km/s
Age262[4] Myr
Other designations
24 Lyn, BD+59° 1103, FK5 292, HD 61497, HIP 37609, HR 2946, SAO 26474, WDS J07430+5843A[7]
Database references
SIMBADdata

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. 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. 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.
  3. 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
  4. 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.
  5. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  6. 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.
  7. "24 Lyn". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-06.
  8. 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.
  9. 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.
  10. Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
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