Astronomy:6 Canis Minoris

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Short description: Star in the constellation Canis Minor
6 Canis Minoris
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Canis Minor
Right ascension  07h 29m 47.78172s[1]
Declination +12° 00′ 23.6347″[1]
Apparent magnitude (V) +4.55[2]
Characteristics
Evolutionary stage giant
Spectral type K1 III[3]
B−V color index 1.276±0.001[2]
Astrometry
Radial velocity (Rv)−16.31±0.13[4] km/s
Proper motion (μ) RA: −0.57[1] mas/yr
Dec.: −18.85[1] mas/yr
Parallax (π)5.70 ± 0.21[1] mas
Distance570 ± 20 ly
(175 ± 6 pc)
Absolute magnitude (MV)−1.67[2]
Details
Mass4.0[5] M☉
Radius44[6] R☉
Luminosity761.44[2] L☉
Temperature4,370[5] K
Metallicity [Fe/H]0.02[5] dex
Rotational velocity (v sin i)1.7[7] km/s
Other designations
6 CMi, BD+12°1567, FK5 1193, GC 10024, HD 59294, HIP 36425, HR 2864, SAO 96952[8]
Database references
SIMBADdata

6 Canis Minoris is a star in the equatorial constellation of Canis Minor, located around 570 light years away from the Sun. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of +4.55.[2] This object is moving closer to the Earth with a heliocentric radial velocity of −16.3 km/s.[4] Kinematically, it is a member of an outlying group belonging to the Ursa Major flow of the Sirius supercluster.[9]

This is an evolved giant star with a stellar classification of K1 III.[3] It has a mild barium anomaly,[10] which may indicate this is a binary star system with a white dwarf companion.[11] The interferometry-measured angular diameter of the visible component is about 2.31±0.03 mas,[12] which, at its estimated distance, equates to a physical radius of about 44 times the radius of the Sun.[6] This star has four[5] times the mass of the Sun and is radiating 761[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,370 K.[5]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K. 
  4. ↑ 4.0 4.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  5. ↑ 5.0 5.1 5.2 5.3 5.4 Gondoin, P. (December 1999), "Evolution of X-ray activity and rotation on G-K giants", Astronomy and Astrophysics 352: 217–227, Bibcode: 1999A&A...352..217G. 
  6. ↑ 6.0 6.1 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41.  The radius (R*) is given by:
    [math]\displaystyle{ \begin{align} 2\cdot R_* & = \frac{(10^{-3}\cdot 175.4\cdot 2.31)\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\ & \approx 87.2\cdot R_{\bigodot} \end{align} }[/math]
  7. ↑ De Medeiros, J. R. et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics 363: 239–243, Bibcode: 2000A&A...363..239D. 
  8. ↑ "6 CMi". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=6+CMi. 
  9. ↑ Chupina, N. V. et al. (June 2006), "Kinematic structure of the corona of the Ursa Major flow found using proper motions and radial velocities of single stars", Astronomy and Astrophysics 451 (3): 909–916, doi:10.1051/0004-6361:20054009, Bibcode: 2006A&A...451..909C. 
  10. ↑ Escorza, A. et al. (December 2017), "Hertzsprung-Russell diagram and mass distribution of barium stars", Astronomy & Astrophysics 608: 13, doi:10.1051/0004-6361/201731832, A100, Bibcode: 2017A&A...608A.100E. 
  11. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  12. ↑ Richichi, A. et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics 431 (2): 773–777, doi:10.1051/0004-6361:20042039, Bibcode: 2005A&A...431..773R 



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