20 Canum Venaticorum

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20 Canum Venaticorum - Wikipedia

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20 Canum Venaticorum
Observation data Epoch J2000 Equinox J2000
A light curve for AO Canum Venaticorum, plotted from TESS data [1]
Constellation	Canes Venatici
Right ascension	13^h 17^m 32.54093^s^[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 (R_v)	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 mas^[2]
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
20 CVn, AO Canum Venaticorum, BD+41°2380, FK5 494, GC 18000, HD 115604, HIP 64844, HR 5017, SAO 44549^[10]
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. Retrieved 8 December 2021.
^ ^a ^b ^c ^d ^e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
^ ^a ^b 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, Bibcode:2001AJ....121.2148G, doi:10.1086/319956.
^ ^a ^b Chadid, M.; et al. (August 2001), "20 CVn: A monoperiodic radially pulsating delta Scuti star", Astronomy and Astrophysics, 375: 113–121, Bibcode:2001A&A...375..113C, doi:10.1051/0004-6361:20010809.
^ ^a ^b 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.
^ ^a ^b ^c 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, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
^ Adamczak, Jens; Lambert, David L. (August 2014), "Carbon and Oxygen Abundances across the Hertzsprung Gap", The Astrophysical Journal, 791 (1): 12, arXiv:1407.2157, Bibcode:2014ApJ...791...58A, doi:10.1088/0004-637X/791/1/58, S2CID 119104634, 58.
^ 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, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943, S2CID 14070763.
^ "20 CVn". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-26.
^ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ 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, Bibcode:1971PASP...83..741E, doi:10.1086/129211, S2CID 119993774.
^ Morgan, W. W.; Abt, H. A. (February 1972), "The spectral classification of the F stars of intermediate luminosity", Astronomical Journal, 77: 35–37, Bibcode:1972AJ.....77...35M, doi:10.1086/111242.
^ Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/s1063772917010085, S2CID 125853869.

Constellation of Canes Venatici

Stars

Bayer	α¹ α² (Cor Caroli) β (Chara)
Flamsteed	4 5 6 10 19 20 21 24 25
Variable	R Y (La Superba) RS AM AW BH DG
HR	4997
Other	Gliese 521 HAT-P-12 HAT-P-36 (Tuiren) CWISE J1249+3621

Exoplanets	HAT-P-12b

Star clusters	Messier 3

Galaxies

Messier	51 a (Whirlpool Galaxy) b 63 94 106
NGC	4111 4138 4145 4151 4163 4183 4214 4217 4242 4244 4395 4399 4400 4401 4449 4485 4490 4534 4618 4625 4627 4631 4656 4657 4707 4800 4861 5002 5003 5005 5023 5033 5112 5223 5229 5238 5273 5371 5394
Numbered	I II
Other	3C 285 3C 286 3C 288 DDO 169 IC 883 IC 4182 IC 4271 I Zwicky 36 KKR 03 4C +41.26 TON 618

Galaxy clusters	Canes II Group M51 Group M94 Group NGC 4631 Group

Astronomical events	GRB 090429B SN 1994I SN 2005cs SN 2008ax