24 Canum Venaticorum

24 Canum Venaticorum is a single[9] star in the northern constellation of Canes Venatici, located 277 light years away from the Sun.[1] This object is visible to the naked eye as a faint white-hued star with an apparent visual magnitude of +4.68.[2] It is moving closer to the Earth with a heliocentric radial velocity of −18 km/s.[4]

24 Canum Venaticorum
Observation data
Epoch J2000      Equinox J2000
Constellation Canes Venatici
Right ascension 13h 34m 27.25928s[1]
Declination +49° 00′ 57.5065″[1]
Apparent magnitude (V) +4.68[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A5V
B−V color index 0.132±0.005[2]
Astrometry
Radial velocity (Rv)−18.3±2.8[4] km/s
Proper motion (μ) RA: −128.38[1] mas/yr
Dec.: +28.05[1] mas/yr
Parallax (π)18.09 ± 0.19[1] mas
Distance180 ± 2 ly
(55.3 ± 0.6 pc)
Absolute magnitude (MV)0.85[5]
Details
Mass1.74[6] M☉
Radius1.90[7] R☉
Luminosity40.8+1.1
−1.0[3] L☉
Surface gravity (log g)3.97[6] cgs
Temperature8,285±282[6] K
Rotational velocity (v sin i)159[3] km/s
Age310[6] Myr
Other designations
24 CVn, BD+49° 2227, FK5 3083, GC 18356, HD 118232, HIP 66234, HR 5112, SAO 44668[8]
Database references
SIMBADdata

This is an A-type main-sequence star with a stellar classification of A4 V,[10] and it is a shell star with rotationally-broadened lines.[11] It is 310[6] million years old with a projected rotational velocity of 159 km/s.[3] This rate of spin is giving the star an oblate shape with an equatorial bulge that is 7% larger than the polar radius.[12] The star has 1.74[6] times the mass of the Sun and 1.9[7] times the Sun's radius. It is radiating 41[3] times the Sun's luminosity from its photosphere at an effective temperature of 8,285 K.[6]

24 Canum Venaticorum displays a significant infrared excess at wavelengths of 24μm and 70μm, indicating an orbiting circumstellar debris disk.[11] The signature matches a black body temperature of 464 K for an estimated orbital radius of 1.4 AU.[7]

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, S2CID 18759600.
  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, S2CID 119257644.
  3. 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.
  4. 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.
  5. Pizzolato, N.; et al. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", Astronomy and Astrophysics, 361: 614–628, Bibcode:2000A&A...361..614P
  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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  7. Patel, Rahul I.; et al. (May 2014), "A Sensitive Identification of Warm Debris Disks in the Solar Neighborhood through Precise Calibration of Saturated WISE Photometry", The Astrophysical Journal Supplement Series, 212 (1): 23, arXiv:1403.3435, Bibcode:2014ApJS..212...10P, doi:10.1088/0067-0049/212/1/10, S2CID 119219094, 10.
  8. "24 CVn". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-27.
  9. Eggleton, P. P.; Tokovinin, A. A. (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.
  10. Mora, A.; et al. (2001), "EXPORT: Spectral classification and projected rotational velocities of Vega-type and pre-main sequence stars", Astronomy & Astrophysics, 378 (1): 116–131, Bibcode:2001A&A...378..116M, doi:10.1051/0004-6361:20011098.
  11. Roberge, Aki; Weinberger, Alycia J. (March 2008), "Debris Disks around Nearby Stars with Circumstellar Gas", The Astrophysical Journal, 676 (1): 509–517, arXiv:0711.4561, Bibcode:2008ApJ...676..509R, doi:10.1086/527314, S2CID 18407657.
  12. 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.
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