Mu Coronae Borealis

μ Coronae Borealis
Location of μ Coronae Borealis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Borealis
Right ascension 15h 35m 14.91862s
Declination +39° 00′ 36.2427″
Apparent magnitude (V) 5.12
Characteristics
Evolutionary stage asymptotic giant branch
Spectral type M1.5 IIIb
U−B color index +2.01
B−V color index +1.64
Variable type Unknown type
Astrometry
Radial velocity (Rv)−13.17±0.35 km/s
Proper motion (μ) RA: +24.780 mas/yr
Dec.: +8.594 mas/yr
Parallax (π)5.9176±0.0830 mas
Distance551 ± 8 ly
(169 ± 2 pc)
Absolute magnitude (MV)−1.25
Details
Mass3.0 M☉
Radius78 R☉
Luminosity2,512 L☉
Surface gravity (log g)1.5 cgs
Temperature3,600 K
Metallicity [Fe/H]0.00 dex
Other designations
μ CrB, 6 CrB, BD+34°2773, HD 139153, HIP 76307, HR 5800
Database references
SIMBADdata

Mu Coronae Borealis is a solitary, ruby-hued star located in the northern constellation of Corona Borealis. Its name is a Bayer designation that is Latinized from μ Coronae Borealis, and abbreviated Mu CrB or μ CrB. This star is faintly visible to the naked eye, having an apparent visual magnitude of around 5.12. Based upon an annual parallax shift of 5.92 mas, it is located at a distance of approximately 551 light-years (169 pc) from the Sun. It is rifting closer with a line of sight velocity component of −13 km/s.

This is an evolved red giant star with a stellar classification of M1.5 IIIb. It is currently on the asymptotic giant branch and is a variable star of uncertain type, showing a change in brightness with an amplitude of 0.0147 magnitude and a frequency of 0.02455 cycles per day, or 40.7 days/cycle. This star has 3.0 times the mass of the Sun and has expanded to 78 times the Sun's radius. On average, it is radiating 2,512 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,600 K.

References

  1. 1 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 XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 Walker, R. L. Jr. (April 1971), "UBV Photometry of 173 PZT Stars", Publications of the Astronomical Society of the Pacific, 83 (492): 177, Bibcode:1971PASP...83..177W, doi:10.1086/129097.
  4. 1 2 Eggen, O. J. (1992), "Asymptotic giant branch stars near the sun", The Astronomical Journal, 104: 275, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
  5. 1 2 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", The Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  6. 1 2 Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x, S2CID 10505995.
  7. 1 2 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  8. 1 2 3 4 5 Charbonnel, C.; et al. (2020), "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era", Astronomy and Astrophysics, 633: A34, arXiv:1910.12732, Bibcode:2020A&A...633A..34C, doi:10.1051/0004-6361/201936360.
  9. 1 2 3 Van Belle, Gerard T.; et al. (2021), "Direct Measurements of Giant Star Effective Temperatures and Linear Radii: Calibration against Spectral Types and V - K Color", The Astrophysical Journal, 922 (2): 163, arXiv:2107.09205, Bibcode:2021ApJ...922..163V, doi:10.3847/1538-4357/ac1687.
  10. ↑ "mu. CrB", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-08-26.
  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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.