Astronomy:Mu Canis Majoris

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Short description: Star in the constellation Canis Major
Mu Canis Majoris
Location of μ Canis Majoris (circled)
Observation data
{{#ifeq:J2000.0|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| [[History:Epoch|Epoch J2000.0]]      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0}}
Constellation Canis Major
μ CMa A
Right ascension  06h 56m 06.6459s[1]
Declination −14° 02′ 36.351″[1]
Apparent magnitude (V) 5.27[2]
μ CMa B
Right ascension  06h 56m 06.5891s[3]
Declination −14° 02′ 33.633″[3]
Apparent magnitude (V) 7.32[2]
Characteristics
Spectral type K2/3 III + B9/A0 V[4]
Astrometry
μ CMa A
Radial velocity (Rv)18.1±0.1[5] km/s
Proper motion (μ) RA: −1.106[1] mas/yr
Dec.: +6.383[1] mas/yr
Parallax (π)3.4219 ± 0.0937[1] mas
Distance950 ± 30 ly
(292 ± 8 pc)
Absolute magnitude (MV)−2.22[6]
μ CMa B
Proper motion (μ) RA: +0.355 mas/yr
Dec.: +6.594 mas/yr
Parallax (π)3.4079 ± 0.0551[3] mas
Distance960 ± 20 ly
(293 ± 5 pc)
Orbit[7]
PrimaryA
CompanionB
Semi-major axis (a)829 astronomical unit|AU
Eccentricity (e)0.62+0.29
−0.23
Details
μ CMa A
Mass5.4[1] M☉
Radius80[1] R☉
Luminosity1,660[1] L☉
Surface gravity (log g)1.14[8] cgs
Temperature4,123[8] K
Rotational velocity (v sin i)≤ 5[9] km/s
Age100[8] Myr
μ CMa B
Mass1.6[10] M☉
Surface gravity (log g)2.70[10] cgs
Temperature5,034[10] K
Other designations
μ CMa, 18 Canis Majoris, BD−13°1741, HIP 33345, HR 2593, SAO 152123[11]
μ CMa A: HD 51250[11]
μ CMa B: HD 51251[12]
Database references
SIMBADA
B

Mu Canis Majoris is a binary star[2] system in the southern constellation of Canis Major. The pair can be located a little to the southwest of the point midway between Gamma and Theta Canis Majoris,[13] and the components can be split with a small telescope.[14] Their name is a Bayer designation that is Latinized from μ Canis Majoris, and abbreviated as Mu CMa or μ CMa. The system is faintly visible to the naked eye with a combined apparent visual magnitude of 5.12.[2] Based upon an annual parallax shift of 3.42 mas as seen from Earth,[1] this system is located roughly 950–960 light years from the Sun.

Grotius assigned the name Isis to this star, but the name, now obsolete, belonged rather to Gamma Canis Majoris.[15]

As of 2011, the pair had an angular separation of 2.77 arc seconds along a position angle of 343.9°.[16] The orange-hued primary member, component A, is an evolved K-type giant star with a stellar classification of K2/3 III[4] and a visual magnitude of 5.27.[2] It has 5.4 times the mass, 80 times the radius, and 1,660 times the luminosity of the Sun.[1] The base magnitude 7.32[2] companion, component B, is a hybrid B/A-type main-sequence star with a class of B9/A0 V.[4] It has 1.6 times the mass of the Sun and is the hotter star, having an effective temperature of 5,034 K,[10] compared to 4,123 K for the primary.[8]

The system has two visual companions. As of 2008, magnitude 10.32 component C lies at an angular separation of 86.90″, while magnitude 10.64 component D is at a separation of 105.0″.[17] Mu CMa should not be confused with the 9th magnitude variable star MU CMa located near NGC 2360.[18]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 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. 
  3. ↑ 3.0 3.1 3.2 Cite error: Invalid <ref> tag; no text was provided for refs named DR3b
  4. ↑ 4.0 4.1 4.2 Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1988mcts.book.....H. 
  5. ↑ 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D. 
  6. ↑ Ginestet, N.; Carquillat, J. M. (2002), "Spectral Classification of the Hot Components of a Large Sample of Stars with Composite Spectra, and Implication for the Absolute Magnitudes of the Cool Supergiant Components", The Astrophysical Journal Supplement Series 143 (2): 513, doi:10.1086/342942, Bibcode: 2002ApJS..143..513G. 
  7. ↑ Hwang, Hsiang-Chih et al. (May 2022), "The eccentricity distribution of wide binaries and their individual measurements" (in en), Monthly Notices of the Royal Astronomical Society 512 (3): 3383–3399, doi:10.1093/mnras/stac675, ISSN 0035-8711, Bibcode: 2022MNRAS.512.3383H. 
  8. ↑ 8.0 8.1 8.2 8.3 Kordopatis, G. et al. (2023), "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3", Astronomy and Astrophysics 669: A104, doi:10.1051/0004-6361/202244283, Bibcode: 2023A&A...669A.104K. 
  9. ↑ Eaton, J. A. (May 1990), "Rotational Velocities of G and K Giants", Information Bulletin on Variable Stars 3460: 1, Bibcode: 1990IBVS.3460....1E. 
  10. ↑ 10.0 10.1 10.2 10.3 Anders, F. et al. (August 2019), "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18" (in en), Astronomy and Astrophysics 628: A94, doi:10.1051/0004-6361/201935765, ISSN 0004-6361, Bibcode: 2019A&A...628A..94A 
  11. ↑ 11.0 11.1 "mu. CMa". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=mu.+CMa. 
  12. ↑ "HD 51251". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+51251. 
  13. ↑ O'Meara, Steve (2007), Herschel 400 Observing Guide, Cambridge University Press, p. 63, ISBN 978-0521858939, https://books.google.com/books?id=Nyh9fAC_tpIC&pg=PA63. 
  14. ↑ Consolmagno, Guy (2011), Turn Left at Orion: Hundreds of Night Sky Objects to See in a Home Telescope – and How to Find Them, Cambridge, United Kingdom: Cambridge University Press, p. 81, ISBN 978-1-139-50373-0, https://books.google.com/books?id=h3712RgWkOYC&pg=PA80. 
  15. ↑ Allen, Richard Hinckley (June 1963), Star Names: Their Lore and Meaning, Dover Publications, ISBN ((978-0486210797)), https://archive.org/details/starnamestheirlo00alle. 
  16. ↑ Mason, Brian D. et al. (May 2012), "Speckle Interferometry at the U.S. Naval Observatory. XVIII", The Astronomical Journal 143 (5): 6, doi:10.1088/0004-6256/143/5/124, 124, Bibcode: 2012AJ....143..124M, https://apps.dtic.mil/sti/pdfs/ADA561759.pdf. 
  17. ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M. 
  18. ↑ International variable star Index: MU CMa, AAVSO, http://www.aavso.org/vsx/index.php?view=detail.top&oid=5436, retrieved 2012-06-03. 



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