Astronomy:24 Canum Venaticorum
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 |
| Distance | 180 ± 2 ly (55.3 ± 0.6 pc) |
| Absolute magnitude (MV) | 0.85[5] |
| Details | |
| Mass | 1.74[6] M☉ |
| Radius | 1.90[7] R☉ |
| Luminosity | 40.8+1.1 −1.0[3] L☉ |
| Surface gravity (log g) | 3.97[6] cgs |
| Temperature | 8,285±282[6] K |
| Rotational velocity (v sin i) | 159[3] km/s |
| Age | 310[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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 astronomical unit|AU.[7]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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 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 3.2 3.3 3.4 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.
- ↑ 4.0 4.1 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 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
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 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.
- ↑ 7.0 7.1 7.2 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, doi:10.1088/0067-0049/212/1/10, 10, Bibcode: 2014ApJS..212...10P.
- ↑ "24 CVn". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=24+CVn.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 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, doi:10.1051/0004-6361:20011098, Bibcode: 2001A&A...378..116M.
- ↑ 11.0 11.1 Roberge, Aki; Weinberger, Alycia J. (March 2008), "Debris Disks around Nearby Stars with Circumstellar Gas", The Astrophysical Journal 676 (1): 509–517, doi:10.1086/527314, Bibcode: 2008ApJ...676..509R.
- ↑ 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.
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