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HR 5110

A light curve for BH Canum Venaticorum, plotted from TESS data
Observation data Epoch J2000      Equinox J2000
Constellation	Canes Venatici
Right ascension	13 34 47.80827
Declination	+37° 10′ 56.6979″
Apparent magnitude (V)	4.91
Characteristics
Spectral type	kA6hF1mF2 (F2 IV + K0 IV)
B−V color index	0.404±0.010
Variable type	RS CVn
Astrometry
Radial velocity (Rv)	6.43±0.24 km/s
Proper motion (μ)	RA: +84.63 mas/yr Dec.: −9.34 mas/yr
Parallax (π)	21.90 ± 0.23 mas
Distance	149 ± 2 ly (45.7 ± 0.5 pc)
Absolute magnitude (MV)	1.61
Orbit
Period (P)	2.613214 d
Semi-major axis (a)	0.017 AU
Eccentricity (e)	0.00
Inclination (i)	171.1°
Longitude of the node (Ω)	89±10°
Periastron epoch (T)	2,445,766.655
Details
BH CVn A
Mass	1.5 M☉
Radius	2.6 R☉
Luminosity	19.01 L☉
Surface gravity (log g)	3.61±0.14 cgs
Temperature	6,569±223 K
Metallicity	−0.20 dex
Age	1.36 Gyr
BH CVn B
Mass	0.8 M☉
Radius	3.4 R☉
Other designations
BH CVn, BD+37° 2426, FK5 502, HD 118216, HIP 66257, HR 5110, SAO 63623
Database references
SIMBAD	data

HR 5110, also known as BH Canum Venaticorum, is a binary star system in the northern constellation of Canes Venatici. It is visible to the naked eye with an apparent visual magnitude of 4.91. Based upon an annual parallax shift of 21.90±0.23 mas, it is located 149 light-years away. The system is moving further from the Sun with a heliocentric radial velocity of 6.4 km/s.

This is a close binary system with an orbital period of 2.6 days and an orbital plane that is oriented nearly face-on. It may be considered an Algol-type semidetached binary. The hotter primary component has a stellar classification of F2 IV, indicating it is an evolving subgiant star that is leaving the main sequence after consuming the hydrogen at its core.

HR 5110 is classified as a RS Canum Venaticorum variable system, primarily due to chromospheric activity in the secondary component. This star has a classification of K0 IV, matching a K-type subgiant star. Based upon the close separation of the pair and the class of the secondary component, that latter is probably filling its roche lobe. This star is most likely the source of the radio emission from this system, and the alignment of this signal is consistent with a polar starspot.

References

1. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
2. ^ 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.
3. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
4. Abt, Helmut A. (2009), "MK Classifications of Spectroscopic Binaries", The Astrophysical Journal Supplement, 180 (1): 117–18, Bibcode:2009ApJS..180..117A, doi:10.1088/0067-0049/180/1/117, S2CID 122811461.
5. ^ Ransom, R. R.; et al. (April 2003), "Very Long Baseline Interferometry Imaging of the RS Canum Venaticorum Binary Star System HR 5110", The Astrophysical Journal, 587 (1): 390–397, arXiv:astro-ph/0301413, Bibcode:2003ApJ...587..390R, doi:10.1086/368070, S2CID 18203880.
6. ^ Abbuhl, E.; Mutel, R. L.; Lynch, C.; Güedel, M. (September 2015), "Radio Astrometry of the Close Active Binary HR5110", The Astrophysical Journal, 811 (1): 8, arXiv:1508.06654, Bibcode:2015ApJ...811...33A, doi:10.1088/0004-637X/811/1/33, S2CID 118373672, 33
7. ^ 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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
8. "V* BH CVn". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-06-07.

v t e Constellation of Canes Venatici
Canes Venatici in Chinese astronomy Giant Void List of stars in Canes Venatici
Stars	Bayer α α (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 4263 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
Category

• Am stars
• F-type subgiants
• K-type subgiants
• RS Canum Venaticorum variables
• Spectroscopic binaries
• Canes Venatici
• Durchmusterung objects
• Henry Draper Catalogue objects
• Hipparcos objects
• Bright Star Catalogue objects
• Objects with variable star designations