Astronomy:20 Canum Venaticorum
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Canes Venatici |
| Right ascension | 13h 17m 32.54093s[2] |
| Declination | +40° 34′ 21.3875″[2] |
| Apparent magnitude (V) | +4.715[3] |
| Characteristics | |
| Spectral type | A9 II mF2[4] |
| B−V color index | 0.30[3] |
| Variable type | δ Sct[5] |
| Astrometry | |
| Radial velocity (Rv) | 9.32±0.16[6] km/s |
| Proper motion (μ) | RA: −113.761[2] mas/yr Dec.: +19.858[2] mas/yr |
| Parallax (π) | 13.7210 ± 0.1581[2] mas |
| Distance | 238 ± 3 ly (72.9 ± 0.8 pc) |
| Details | |
| Mass | 2.43[3] M☉ |
| Radius | 4[7] R☉ |
| Luminosity | 63[3] L☉ |
| Surface gravity (log g) | 2.97[8] cgs |
| Temperature | 7,314±42[3] K |
| Metallicity [Fe/H] | 0.18[7] dex |
| Rotational velocity (v sin i) | 15[9] km/s |
| Age | 750[3] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
20 Canum Venaticorum is a single[11] variable star in the northern constellation of Canes Venatici, located 238 light years from the Sun. This object has the variable star designation AO Canum Venaticorum; 20 Canum Venaticorum is the Flamsteed designation. It is visible to the naked eye as a faint, white-hued star with a baseline apparent visual magnitude of +4.72.[3] The star is moving further from the Earth with a heliocentric radial velocity of +9 km/s.[6] Eggen (1971) listed this star as a member of the Hyades Stream.[12]
This star has a stellar classification of A9 II mF2, which indicates the hydrogen line matches an A-type bright giant but the metal lines are closer to an F-type star. However, it does not appear to be an Am star as the Calcium K line is normal.[4] Earlier, Morgan and Abt (1972) assigned it a giant star class of F3 III.[13] It is classified as a Delta Scuti type variable star with a single radial pulsation mode providing the best fit to the observed variation.[5] Its brightness varies from magnitude +4.70 to +4.75 with a period of 2.92 hours.[14]
20 Canum Venaticorum is 750[3] million years old with 2.43[3] times the mass of the Sun and 4[7] time the Sun's radius. It is radiating 63[3] times the Sun's luminosity from its photosphere at an effective temperature of 7,314 K.[3]
References
- ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal 150 (3): 88, doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L.
- ↑ 4.0 4.1 Gray, R. O. et al. (2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", The Astronomical Journal 121 (4): 2148, doi:10.1086/319956, Bibcode: 2001AJ....121.2148G.
- ↑ 5.0 5.1 Chadid, M. et al. (August 2001), "20 CVn: A monoperiodic radially pulsating delta Scuti star", Astronomy and Astrophysics 375: 113–121, doi:10.1051/0004-6361:20010809, Bibcode: 2001A&A...375..113C.
- ↑ 6.0 6.1 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.
- ↑ 7.0 7.1 7.2 Massarotti, Alessandro et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal 135 (1): 209–231, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M.
- ↑ Adamczak, Jens; Lambert, David L. (August 2014), "Carbon and Oxygen Abundances across the Hertzsprung Gap", The Astrophysical Journal 791 (1): 12, doi:10.1088/0004-637X/791/1/58, 58, Bibcode: 2014ApJ...791...58A.
- ↑ Royer, F. et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics 393: 897–911, doi:10.1051/0004-6361:20020943, Bibcode: 2002A&A...393..897R.
- ↑ "20 CVn". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=20+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.
- ↑ Eggen, O. J. (December 1971), "Luminosities and Motions of the F-Type Stars. I. Luminosity and Metal Abundance Indices for Disk Population Stars", Publications of the Astronomical Society of the Pacific 83 (496): 741, doi:10.1086/129211, Bibcode: 1971PASP...83..741E.
- ↑ Morgan, W. W.; Abt, H. A. (February 1972), "The spectral classification of the F stars of intermediate luminosity", Astronomical Journal 77: 35–37, doi:10.1086/111242, Bibcode: 1972AJ.....77...35M.
- ↑ Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/s1063772917010085, Bibcode: 2017ARep...61...80S.
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