19 Canum Venaticorum

Last updated
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  mas [1]
Distance 238 ± 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
Mass 2.06±0.03 [4]   M☉
Radius 2.5 [8]   R☉
Luminosity 25.5+1.9
−1.8 [4]   L☉
Surface gravity (log g)4.09±0.14 [9]   cgs
Temperature 8,048±274 [9]   K
Rotational velocity (v sin i)110 [4]  km/s
Age 366 [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
SIMBAD data

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]

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. 1 2 3 4 5 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. 1 2 3 4 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. 1 2 3 Mason, B. D.; et al. (December 2001). "The Washington Visual Double Star Catalog (WDS), Version 2019-01-21". The Astronomical Journal. 122 (6). U. S. Naval Observatory, Washington D.C.: 3466–3471. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 .
  4. 1 2 3 4 5 6 7 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.
  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. 1 2 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.
  7. 1 2 3 Double Stars Information Circular (PDF), vol. 187, International Astronomical Union, Commission G1, October 2015, retrieved 2019-01-26
  8. 1 2 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. 1 2 3 4 5 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.
  10. ↑ "19 CVn". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018-07-26.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.