FN Canis Majoris

FN Canis Majoris is a binary star[3] system in the southern constellation Canis Major, near the northern constellation border with Monoceros. It is dimly visible to the naked eye with a combined apparent visual magnitude of 5.41.[2] The system is located at a distance of approximately 3,000 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +31 km/s.[2] It is a runaway star associated with the Sh 2-296 nebula in the CMa OB1 association, and has a conspicuous bow-shock feature.[5]

FN Canis Majoris
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Canis Major
Right ascension  07h 06m 40.76672s[1]
Declination −11° 17′ 38.4396″[1]
Apparent magnitude (V) 5.41[2] (5.69 + 7.04)[3]
Characteristics
Spectral type B0 III/IV[4] or B2 Ia/ab[5]
B−V color index 0.033±0.004[2]
Astrometry
Radial velocity (Rv)+31.0±4.2[2] km/s
Proper motion (μ) RA: −3.14±0.72[1] mas/yr
Dec.: +3.32±0.55[1] mas/yr
Parallax (π)1.07 ± 0.61[1] mas
Distanceapprox. 3,000 ly
(approx. 900 pc)
Details
Mass19.23±1.85,[6]
24.0±0.1,[7]
35.5±4.6[8] M☉
Luminosity (bolometric)122,079,[6]
690,000[8] L☉
Surface gravity (log g)3.59±0.11[8] cgs
Temperature26,850,[6]
33,600±1,840[8] K
Rotational velocity (v sin i)100±9[8] km/s
Age6.0±0.1[7] Myr
Other designations
FN CMa, BD−11°1790, GC 9389, HD 53974, HIP 34301, HR 2678, SAO 152394, WDS J07067-1118[9]
Database references
SIMBADdata

The brighter component is a visual magnitude 5.69[3] B-type star that has been assigned various stellar classification from B0 III/IV[4] to B2 Ia/ab,[5] suggesting it is an evolved state. In the past it was classified as a Beta Cephei type variable star[10] with an apparent magnitude that was measured varing between +5.38 and +5.42 over a period of 36.7 hours,[11] but is no longer considered to be one.[12] This is a massive star with estimates ranging from 19[6] to 36[8] times the mass of the Sun, and luminosity estimates of 122,079[6] to 690,000[8] times the Sun's luminosity. The magnitude 7.04[3] companion is located at an angular separation of 0.60″ from the primary at a position angle of 111°, as of 2003.[13]

References
  1. 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.
  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. Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  4. Tjin A Djie, H. R. E.; et al. (August 2001). "The stellar composition of the star formation region CMa R1 - II. Spectroscopic and photometric observations of nine young stars". Monthly Notices of the Royal Astronomical Society. 325 (4): 1441–1457. arXiv:astro-ph/0103349. Bibcode:2001MNRAS.325.1441T. doi:10.1046/j.1365-8711.2001.04541.x.
  5. Fernandes, B.; et al. (August 2019). "Runaways and shells around the CMa OB1 association". Astronomy & Astrophysics. 628: 15. arXiv:1906.00113. Bibcode:2019A&A...628A..44F. doi:10.1051/0004-6361/201935484. A44.
  6. Hohle, M. M.; et al. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349–360. arXiv:1003.2335. Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355.
  7. Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x
  8. Zorec, J.; et al. (November 2016). "Critical study of the distribution of rotational velocities of Be stars. I. Deconvolution methods, effects due to gravity darkening, macroturbulence, and binarity". Astronomy & Astrophysics. 595: 26. Bibcode:2016A&A...595A.132Z.
  9. "FN CMa". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-03-09.
  10. Hill, Graham (1967). "On Beta Cephei Stars: a Search for Beta Cephei Stars". The Astrophysical Journal Supplement Series. 14: 263. Bibcode:1967ApJS...14..263H. doi:10.1086/190156. ISSN 0067-0049.
  11. Lefèvre, L.; Marchenko, S. V.; Moffat, A. F. J.; Acker, A. (2009). "A systematic study of variability among OB-stars based on HIPPARCOS photometry". Astronomy and Astrophysics. 507 (2): 1141–1201. Bibcode:2009A&A...507.1141L. doi:10.1051/0004-6361/200912304. ISSN 0004-6361.
  12. Stankov, Anamarija; Handler, Gerald (2005). "Catalog of Galactic β Cephei Stars". The Astrophysical Journal Supplement Series. 158 (2): 193–216. arXiv:astro-ph/0506495. Bibcode:2005ApJS..158..193S. doi:10.1086/429408. ISSN 0067-0049.
  13. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122: 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
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