BU Canis Minoris

BU Canis Minoris is a binary star[6] system in the equatorial constellation of Canis Minor. It has the Henry Draper Catalogue designation of HD 65241, while BU Canis Minoris is its variable star designation. The system is a challenge to view with the naked eye, having a peak apparent visual magnitude of 6.42.[2] It is located at a distance of approximately 700 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of about +34 km/s.[2]

BU Canis Minoris
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Minor
Right ascension  07h 58m 05.89734s[1]
Declination 07° 12′ 48.7030″[1]
Apparent magnitude (V) 6.42[2]
Characteristics
Spectral type A0V[3]
B−V color index −0.031±0.008[2]
Astrometry
Radial velocity (Rv)+34.0±6.5[2] km/s
Proper motion (μ) RA: −9.407[1] mas/yr
Dec.: −11.835[1] mas/yr
Parallax (π)4.0663 ± 0.0568[1] mas
Distance800 ± 10 ly
(246 ± 3 pc)
Absolute magnitude (MV)−0.38[2]
Details
Radius2.0[4] R☉
Luminosity158.70[2] L☉
Temperature10829±797[5] K
Rotational velocity (v sin i)~70[6] km/s
Other designations
BU CMi, BD+07°1879, HD 65241, HIP 38945, HR 3103, SAO 116179[7]
Database references
SIMBADdata

This pair is a double-lined spectroscopic binary system[6] that forms an Algol-like eclipsing binary. The brightness of the system decreases from 6.44 down to 6.53 during the primary eclipse.[8] It has a stellar classification of A0V,[3] which matches an A-type main-sequence star that is generating energy through hydrogen fusion at its core.

References
  1. 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.
  2. 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.
  3. Cowley, A.; Cowley, C.; Jaschek, M.; Jaschek, C. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
  4. Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics (Third ed.), 367 (2): 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  5. Paunzen, E.; et al. (October 2006), "An empirical temperature calibration for the Δ a photometric system. II. The A-type and mid F-type stars", Astronomy and Astrophysics, 458 (1): 293–296, arXiv:astro-ph/0607567, Bibcode:2006A&A...458..293P, doi:10.1051/0004-6361:20064889.
  6. Dworetsky, Michael M. (November 1974), "Rotational Velocities of a0 Stars", Astrophysical Journal Supplement, 28: 101, Bibcode:1974ApJS...28..101D, doi:10.1086/190312.
  7. "BU CMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-11.
  8. 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.
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