Astronomy:19 Canum Venaticorum
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 |
| 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 | |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 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 Mason, B. D. et al. (December 2001). "The Washington Visual Double Star Catalog (WDS), Version 2019-01-21". The Astronomical Journal (U. S. Naval Observatory, Washington D.C.) 122 (6): 3466–3471. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 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.
- ↑ Appenzeller, Immo (April 1967), "MK Spectral Types for 185 Bright Stars", Publications of the Astronomical Society of the Pacific 79 (467): 102, doi:10.1086/128449, Bibcode: 1967PASP...79..102A.
- ↑ 6.0 6.1 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.
- ↑ 7.0 7.1 7.2 Double Stars Information Circular, 187, International Astronomical Union, Commission G1, October 2015, http://www.astro.gsu.edu/wds/bsl/cir187.pdf, retrieved 2019-01-26
- ↑ 8.0 8.1 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. Bibcode: 1999A&A...352..555A.
- ↑ 9.0 9.1 9.2 9.3 9.4 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. doi:10.1088/0004-637X/804/2/146. Bibcode: 2015ApJ...804..146D.
- ↑ "19 CVn". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=19+CVn.
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