DG Canum Venaticorum

Short description: Binary star in constellation Canes Venatici

DG Canum Venaticorum

250px
A light curve for DG Canum Venaticorum, plotted from TESS data.[1] The main plot shows both the low amplitude periodic oscillations, and several flares. The inset plot shows the strongest flare with an expanded time scale.

Observation data
Equinox J2000.0]] (ICRS)
Constellation | Canes Venatici
Right ascension |  13h 31m 46.617s[2]
Declination | +29° 16′ 36.72″[2]
Apparent magnitude (V) | 12.02[3] (12.64 + 12.93)
Characteristics
Spectral type | M4.0Ve[3]
Variable type | Flare star \+ BY Dra[4]
Astrometry
Radial velocity (Rv)| −7.50±6.50[3] km/s
Proper motion (μ)|  RA: −244.1±4.2[3] mas/yr
Dec.: −132.4±4.8[3] mas/yr
Parallax (π)| 55.51 ± 2.38[3] mas
Distance| 59 ± 3 ly
(18.0 ± 0.8 pc)
Absolute magnitude (MV)| 10.74[3] (11.36 + 11.65)
Details

Mass| 0.39[5] M☉
Radius| 0.253[6] R☉
Temperature| 3,263[6] K
Metallicity [Fe/H]| 0.15[7] dex
Rotational velocity (v sin i)| 50[8] km/s

Mass| +0.07[6] M☉
Age| 30[8] Myr
Other designations

DG CVn, G 165-8AB, GJ 3789, TYC 2003-139-1[9]

Database references
SIMBAD| data
ARICNS| data

DG Canum Venaticorum is a variable binary star system[3] in the northern constellation of Canes Venatici. As of 2009, the pair have an angular separation of 0.20″ along a position angle of 285°, which corresponds to a physical separation of around 3.6 AU.[8] With an apparent visual magnitude of 12.02, the pair are much too faint to be seen with the naked eye.[3] Parallax measurements place the system at a distance of roughly 59 light years from the Earth.[3]

The stellar classification of the primary component is M4.0Ve, indicating it is a red dwarf with emission lines present. It is considered a very young system with an estimated age of just 30[8] million years and a higher metallicity than the Sun.[7] One of the components is rotating rapidly, with a projected rotational velocity of 50 km/s.[3]

In 1999, Russell M. Robb et al. discovered that the star, then called GSC 2003_139, is a variable star, exhibiting both periodic and flare brightness variations.[10] Therefore, at least one of the members of this system is a type of variable known as a flare star, which means it undergoes brief increases in brightness at random intervals. It was given its variable star designation, DG Canum Venaticorum, in 2001.[11] On April 23, 2014, a gamma-ray superflare event was observed by the Swift satellite coming from the position of this system. It may have been perhaps the most luminous such events ever observed coming from a red dwarf star. A secondary radio flare was observed a day later.[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 Høg, E. et al. (March 2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics 355: L27–L30, doi:10.1888/0333750888/2862, ISBN 0333750888, Bibcode: 2000A&A...355L..27H.
3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 Riedel, Adric R. et al. (2014), "The Solar Neighborhood. XXXIII. Parallax Results from the CTIOPI 0.9 m Program: Trigonometric Parallaxes of Nearby Low-mass Active and Young Systems", The Astronomical Journal 147 (4): 85, doi:10.1088/0004-6256/147/4/85, Bibcode: 2014AJ....147...85R.
4. ↑ Samus, N. N. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S 1. Bibcode: 2009yCat....102025S.
5. ↑ Cortés-Contreras, M.; Béjar, V. J. S.; Caballero, J. A.; Gauza, B.; Montes, D.; Alonso-Floriano, F. J.; Jeffers, S. V.; Morales, J. C. et al. (2017). "CARMENES input catalogue of M dwarfs. II. High-resolution imaging with Fast Cam". Astronomy & Astrophysics 597: A47. doi:10.1051/0004-6361/201629056. Bibcode: 2017A&A...597A..47C.
6. ↑ 6.0 6.1 6.2 Houdebine, E. R; Mullan, D. J; Paletou, F; Gebran, M (2016). "Rotation-Activity Correlations in K and M Dwarfs. I. Stellar Parameters and Compilations of v sin i and P/sin i for a Large Sample of Late-K and M Dwarfs". The Astrophysical Journal 822 (2): 97. doi:10.3847/0004-637X/822/2/97. Bibcode: 2016ApJ...822...97H.
7. ↑ 7.0 7.1 Newton, Elisabeth R. et al. (January 2014), "Near-infrared Metallicities, Radial Velocities, and Spectral Types for 447 Nearby M Dwarfs", The Astronomical Journal 147 (1): 24, doi:10.1088/0004-6256/147/1/20, 20, Bibcode: 2014AJ....147...20N.
8. ↑ 8.0 8.1 8.2 8.3 8.4 Fender, R. P. et al. (January 2015), "A prompt radio transient associated with a gamma-ray superflare from the young M dwarf binary DG CVn", Monthly Notices of the Royal Astronomical Society: Letters 446 (1): L66–L70, doi:10.1093/mnrasl/slu165, Bibcode: 2015MNRAS.446L..66F.
9. ↑ "DG CVn -- Flare Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), https://simbad.u-strasbg.fr/simbad/sim-id?Ident=DG+Canum+Venaticorum, retrieved 2016-03-11.
10. ↑ Robb, R. M.; Balam, D. D.; Greimel, R. (May 1999). "1RXS J133146+291631 = G 165-8 is a M4Ve spotted star with a rotational period of about 0.10835 days and an amplitude in R of 0.03". Information Bulletin on Variable Stars 4714: 1–4. Bibcode: 1999IBVS.4714....1R. https://articles.adsabs.harvard.edu/pdf/1999IBVS.4714....1R. Retrieved 6 January 2025.
11. ↑ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V. (July 2001). "The 76th Name-List of Variable Stars". Information Bulletin on Variable Stars 5135: 1–67. Bibcode: 2001IBVS.5135....1K. https://ibvs.konkoly.hu/pub/ibvs/5101/5135.pdf. Retrieved 6 January 2025.

## External links

* Reddy, Francis (September 29, 2014), NASA's Swift Mission Observes Mega Flares from a Mini Star, NASA, https://www.nasa.gov/content/goddard/nasas-swift-mission-observes-mega-flares-from-a-mini-star, retrieved 2016-03-12.

* 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

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/DG Canum Venaticorum. Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:DG_Canum_Venaticorum&oldid=3943282"
*[RA:]: Right Ascension
*[Dec.:]: Declination
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template