4 Canum Venaticorum

Short description: Binary star system in the constellation Canes Venatici

4 Canum Venaticorum

250px
A light curve for AI Canes Venaticorum, plotted from TESS data[1]

Observation data
Equinox J2000.0]] (ICRS)
Constellation | Canes Venatici
Right ascension |  12h 23m 47.01208s[2]
Declination | +42° 32′ 33.8622″[2]
Apparent magnitude (V) | +5.89 to 6.15[3]
Characteristics
Evolutionary stage | subgiant[2]
Spectral type | F3 IV[4] or F0 III[5]
B−V color index | 0.366±0.005[6]
Variable type | δ Sct[7]
Astrometry
Radial velocity (Rv)| −0.3±2.9[8] km/s
Proper motion (μ)|  RA: −80.044[2] mas/yr
Dec.: +13.518[2] mas/yr
Parallax (π)| 7.6048 ± 0.0855[2] mas
Distance| 429 ± 5 ly
(131 ± 1 pc)
Absolute magnitude (MV)| +0.75[9]
Orbit[8]
Period (P)| 124.44±0.03 d
Eccentricity (e)| 0.311±0.003
Periastron epoch (T)| 2454605±10.3 JD
Argument of periastron (ω)
(secondary)| 70.2±0.7°
Semi-amplitude (K1)
(primary)| 13.24±0.05 km/s
Details[8]
4 CVn A
Mass| 1.0–2.0 M☉
Radius| 3.7–4.1 R☉
Luminosity| 295+3.6
−3.2 L☉
Surface gravity (log g)| 3.30±0.35 cgs
Temperature| 6,875±120 K
Metallicity [Fe/H]| −0.05±0.15 dex
Rotational velocity (v sin i)| 109±3 km/s
Other designations

4 CVn, AI Canum Venaticorum, BD+43°2218, FK5 2993, GC 16899, HD 107904, HIP 60467, HR 4715, SAO 44155[10]

Database references
SIMBAD| data

4 Canum Venaticorum is a binary star system in the northern constellation of Canes Venatici, located around 429 light-years away.[2] It has the variable star designation AI Canum Venaticorum; 4 Canum Venaticorum is its Flamsteed designation. Its brightness varies from magnitude +5.89 to +6.15 with a period of 2.8 hours,[3] which places it around the lower limit of visibility to the naked eye. This was found to be a binary by Schmid et al. in 2014, based on periodic, non-sinusoidal changes in its radial velocity. It is a single-lined spectroscopic binary with an orbital period of 124.4 days and an eccentricity of 0.31.[8]

The primary component is an evolved F-type star with a stellar classification of F3 IV[4] or F0 III,[5] matching a subgiant or giant star, respectively. Roberta M. Humphreys first showed that the star's brightness varies, in 1966.[11] It is a variable of the Delta Scuti class, displaying both radial and non-radial pulsations.[7] The variable nature of this star was discovered by D. H. P. Jones and C. Margaret Haslam in 1966 at the suggestion of Olin J. Eggen,[12] and it has become one of the best studied stars in its class. The radial pulsations have shown little if any variations between 1974 and 2012. However, the non-radial pulsations vary continuously in frequency over periods spanning decades.[7] It is spinning rapidly with a rotation of at least one third of its critical velocity.[8]

## References

1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
3. ↑ 3.0 3.1 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.
4. ↑ 4.0 4.1 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
5. ↑ 5.0 5.1 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. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
7. ↑ 7.0 7.1 7.2 Breger, M. et al. (March 2017), "Nonradial and radial period changes of the δ Scuti star 4 CVn. II. Systematic behavior over 40 years", Astronomy & Astrophysics 599: 8, doi:10.1051/0004-6361/201629797, A116, Bibcode: 2017A&A...599A.116B.
8. ↑ 8.0 8.1 8.2 8.3 8.4 Schmid, V. S. et al. (October 2014), "Discovery of binarity, spectroscopic frequency analysis, and mode identification of the δ Scuti star 4 CVn", Astronomy & Astrophysics 570: 17, doi:10.1051/0004-6361/201423669, A33, Bibcode: 2014A&A...570A..33S.
9. ↑ Eggen, Olin J. (July 1998), "The Age Range of Hyades Stars", The Astronomical Journal 116 (1): 284–292, doi:10.1086/300413, Bibcode: 1998AJ....116..284E.
10. ↑ "4 CVn". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=4+CVn.
11. ↑ Humphreys, Roberta M. (February 1967). "Photoelectric Observations of 4 Canum Venaticorum". Publications of the Astronomical Society of the Pacific 79 (466): 78–80. doi:10.1086/128444. Bibcode: 1967PASP...79...78H.
12. ↑ Jones, D. H. P.; Haslam, C. M. (February 1966), "A new delta Scuti variable", The Observatory 86: 34, Bibcode: 1966Obs....86...34J.

* v
* t
* e

Canes Venatici constellation

Stars (list)|

| Bayer|

* α (Cor Caroli)
* β (Chara)

|

Flamsteed|

* 2
* 3
* 4
* 5
* 6
* 7
* 9
* 10
* 11
* 14
* 15
* 16
* 17
* 18
* 19
* 20
* 21
* 23
* 24
* 25

Variable|

* R
* V
* W
* Y (La Superba)
* Z
* RS
* ST
* TT
* TU
* TX
* UX
* UZ
* VZ
* AM
* AW
* AX
* BH
* BI
* BL
* BM
* CL
* DD
* DG
* DT

HR|

* 4783
* 4784
* 4843
* 4904
* 4919
* 4945
* 4964
* 4997
* 5022
* 5025
* 5045
* 5067
* 5077
* 5083
* 5096
* 5108
* 5143
* 5145
* 5160
* 5161
* 5179
* 5180
* 5186
* 5195
* 5204
* 5215
* 5229
* 5245
* 5271

HD|

* 107610
* 109995
* 111572
* 114975
* 115444
* 121197

Gliese|

* Gliese 490
* Gliese 521
* GJ 3789
* GJ 3801

Other|

* GD 154
* HAT-P-12
* HAT-P-36

Star clusters|

| Globular|

* Messier 3

|

Galaxies|

| Messier|

* 51 (Whirlpool Galaxy)
* 63
* 94
* 106

|

NGC|

* 4109
* 4111
* 4117
* 4118
* 4135
* 4137
* 4138
* 4143
* 4145
* 4145A
* 4148
* 4151
* 4156
* 4163
* 4183
* 4187
* 4187B
* 4187C
* 4190
* 4214
* 4217
* 4218
* 4220
* 4226
* 4227
* 4229
* 4231
* 4232
* 4242
* 4244
* 4248
* 4288
* 4288A
* 4346
* 4369
* 4381
* 4389
* 4392
* 4395
* 4399
* 4400
* 4401
* 4449
* 4460
* 4485
* 4490
* 4509
* 4534
* 4542
* 4583
* 4617
* 4618
* 4619
* 4625
* 4627
* 4631
* 4655
* 4656
* 4657
* 4662
* 4687
* 4704
* 4707
* 4711
* 4719
* 4737
* 4741
* 4774
* 4800
* 4834
* 4837
* 4846
* 4861
* 4868
* 4870
* 4893
* 4901
* 4914
* 4917
* 4932
* 4938
* 4956
* 4959
* 4963
* 4985
* 4986
* 4987
* 4998
* 5002
* 5003
* 5005
* 5009
* 5014
* 5021
* 5023
* 5025
* 5029
* 5033
* 5040
* 5074
* 5083
* 5093
* 5096
* 5098A
* 5098B
* 5103
* 5107
* 5112
* 5117
* 5123
* 5127
* 5131
* 5141
* 5142
* 5143
* 5145
* 5149
* 5154
* 5157
* 5166
* 5166B
* 5169
* 5173
* 5187
* 5195
* 5198
* 5199
* 5214
* 5214A
* 5223
* 5225
* 5228
* 5229
* 5233
* 5238
* 5240
* 5243
* 5259
* 5263
* 5265
* 5267
* 5271
* 5273
* 5274
* 5275
* 5276
* 5277
* 5280
* 5282
* 5287
* 5289
* 5290
* 5296
* 5297
* 5301
* 5303
* 5303B
* 5305
* 5311
* 5312
* 5313
* 5318
* 5319
* 5320
* 5321
* 5325
* 5325B
* 5326
* 5336
* 5337
* 5341
* 5346
* 5347
* 5349
* 5350
* 5351
* 5352
* 5353
* 5354
* 5355
* 5358
* 5361
* 5362
* 5371
* 5377
* 5378
* 5380
* 5383
* 5396
* 5399
* 5401
* 5403
* 5406
* 5407
* 5410
* 5421A
* 5421B
* 5433
* 5439
* 5440
* 5441
* 5444
* 5445

Other|

* B2 1225+317
* 3C 268.4
* 3C 270.1
* 3C 280
* 3C 280.1
* 3C 285
* 3C 286
* 3C 288
* 3C 293
* 3C 294
* Canes Venatici I
* Canes Venatici II
* DDO 125
* DDO 169
* IC 883
* IC 4182
* KPG 404 (NGC 5394/5395)
* Markarian 59
* UGCA 292
* I Zw 36

Galaxy
clusters|

* Abell 1758
* Abell 1763
* Canes II Group
* CL J1226+3332
* M51 Group
* M94 Group
* NGC 4631 Group

Other|

* Giant Void
* GRB 060206
* SN 1937C
* SN 1985F
* SN 1994I
* SN 2005cs
* SN 2008ax

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