19 Canum Venaticorum

19 Canum Venaticorum is a binary star[7] system in the northern constellation of Canes Venatici, located approximately 238 light years from Sun based on its parallax. It is dimly visible to the naked eye as a white-hued star with an apparent visual magnitude of 5.77.[2] The pair orbit each other with a period of 219.2 years and an eccentricity of 0.686.[7] The system is moving closer to the Earth with a heliocentric radial velocity of −21 km/s.[6]

19 Canum Venaticorum
Observation data
Epoch J2000      Equinox J2000
Constellation Canes Venatici
Right ascension  13h 15m 31.95263s[1]
Declination +40° 51′ 18.7516″[1]
Apparent magnitude (V) 5.77[2] (5.87 + 9.48)[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type A7 V[5]
B−V color index 0.198±0.004[2]
Astrometry
Radial velocity (Rv)−21.1±2.6[6] km/s
Proper motion (μ) RA: −113.761[1] mas/yr
Dec.: +19.858[1] mas/yr
Parallax (π)13.7210 ± 0.1581[1] mas
Distance238 ± 3 ly
(72.9 ± 0.8 pc)
Absolute magnitude (MV)1.42[2]
Orbit[7]
Period (P)219.2 yr
Semi-major axis (a)0.745″
Eccentricity (e)0.686
Inclination (i)44.5°
Longitude of the node (Ω)22.2°
Periastron epoch (T)2201.7
Argument of periastron (ω)
(secondary)		273.3°
Details
19 CVn A
Mass2.06±0.03[4] M☉
Radius2.5[8] R☉
Luminosity25.5+1.9
−1.8[4] L☉
Surface gravity (log g)4.09±0.14[9] cgs
Temperature8,048±274[9] K
Rotational velocity (v sin i)110[4] km/s
Age366[9] Myr
Other designations
19 CVn, BD+41° 2374, FK5 461, HD 115271, HIP 64692, HR 5004, SAO 44531, WDS J13155+4051[10]
Database references
SIMBADdata

The magnitude +5.87 primary, component A, is an A-type main-sequence star with a stellar classification of A7 V.[3] It is 366[9] million years old with twice[4] the mass of the Sun and 2.5[8] times the Sun's radius. The star is radiating 25.5[4] times the Sun's luminosity from its photosphere at an effective temperature of 8,048 K.[9] It has a high rate of spin, showing a projected rotational velocity of 110 km/s.[4] As of 2012, its companion, designated component B, is a magnitude 9.48 star located 0.60 arcseconds from the primary along a position angle of 58°.[3]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  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. Mason, B. D.; et al. (December 2001). The Washington Visual Double Star Catalog (WDS), Version 2019-01-21. The Astronomical Journal. 122. U. S. Naval Observatory, Washington D.C. pp. 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
  4. 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.
  5. Appenzeller, Immo (April 1967), "MK Spectral Types for 185 Bright Stars", Publications of the Astronomical Society of the Pacific, 79 (467): 102, Bibcode:1967PASP...79..102A, doi:10.1086/128449.
  6. 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. A61.
  7. Double Stars Information Circular (PDF), 187, International Astronomical Union, Commission G1, October 2015, retrieved 2019-01-26
  8. Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A.
  9. 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.
  10. "19 CVn". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-26.
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