Astronomy:FN Canis Majoris

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Short description: Star in Canis Major constellation
FN Canis Majoris
FNCMaLightCurve.png
A light curve for FN Canis Majoris from Hipparcos data. Adapted from Rivinius et al. (2011)[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Canis Major
Right ascension  07h 06m 40.76672s[2]
Declination −11° 17′ 38.4396″[2]
Apparent magnitude (V) 5.41[3] (5.69 + 7.04)[4]
Characteristics
Spectral type B0 III/IV[5] or B2 Ia/ab[6]
B−V color index 0.033±0.004[3]
Astrometry
Radial velocity (Rv)+31.0±4.2[3] km/s
Proper motion (μ) RA: −3.14±0.72[2] mas/yr
Dec.: +3.32±0.55[2] mas/yr
Parallax (π)1.07 ± 0.61[2] mas
Distanceapprox. 3,000 ly
(approx. 900 pc)
Details
Mass19.23±1.85,[7]
24.0±0.1,[8]
35.5±4.6[9] M☉
Luminosity (bolometric)122,079,[7]
690,000[9] L☉
Surface gravity (log g)3.59±0.11[9] cgs
Temperature26,850,[7]
33,600±1,840[9] K
Rotational velocity (v sin i)100±9[9] km/s
Age6.0±0.1[8] Myr
Other designations
FN CMa, BD−11°1790, GC 9389, HD 53974, HIP 34301, HR 2678, SAO 152394, WDS J07067-1118[10]
Database references
SIMBADdata

FN Canis Majoris is a binary star[4] 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.[3] 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.[3] It is a runaway star associated with the Sh 2-296 nebula in the CMa OB1 association, and has a conspicuous bow-shock feature.[6]

The brighter component is a visual magnitude 5.69[4] B-type star that has been assigned various stellar classification from B0 III/IV[5] to B2 Ia/ab,[6] suggesting it is an evolved state. In the past it was classified as a Beta Cephei type variable star[11] with an apparent magnitude that was measured varing between +5.38 and +5.42 over a period of 36.7 hours,[12] but is no longer considered to be one.[13] This is a massive star with estimates ranging from 19[7] to 36[9] times the mass of the Sun, and luminosity estimates of 122,079[7] to 690,000[9] times the Sun's luminosity. The magnitude 7.04[4] companion is located at an angular separation of 0.60″ from the primary at a position angle of 111°, as of 2003.[14]

References

  1. ↑ Rivinius, Th.; Stahl, O.; Štefl, S.; Baade, D.; Townsend, R. H. D.; Barrera, L. (July 2011). "The (B0+?)+O6 system FN CMa: a case for tidal-pulsational interaction?". Proceedings IAU Symposium 272: 543–544. doi:10.1017/S1743921311011380. Bibcode: 2011IAUS..272..543R. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 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. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  4. ↑ 4.0 4.1 4.2 4.3 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  5. ↑ 5.0 5.1 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. doi:10.1046/j.1365-8711.2001.04541.x. Bibcode: 2001MNRAS.325.1441T. 
  6. ↑ 6.0 6.1 6.2 Fernandes, B. et al. (August 2019). "Runaways and shells around the CMa OB1 association". Astronomy & Astrophysics 628: 15. doi:10.1051/0004-6361/201935484. A44. Bibcode: 2019A&A...628A..44F. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 Hohle, M. M. et al. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten 331 (4): 349–360. doi:10.1002/asna.200911355. Bibcode: 2010AN....331..349H. 
  8. ↑ 8.0 8.1 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, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 9.6 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. doi:10.1051/0004-6361/201628760. Bibcode: 2016A&A...595A.132Z. 
  10. ↑ "FN CMa". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=FN+CMa. 
  11. ↑ Hill, Graham (1967). "On Beta Cephei Stars: a Search for Beta Cephei Stars". The Astrophysical Journal Supplement Series 14: 263. doi:10.1086/190156. ISSN 0067-0049. Bibcode: 1967ApJS...14..263H. 
  12. ↑ 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. doi:10.1051/0004-6361/200912304. ISSN 0004-6361. Bibcode: 2009A&A...507.1141L. https://hal.science/hal-03742152/file/aa12304-09.pdf. 
  13. ↑ Stankov, Anamarija; Handler, Gerald (2005). "Catalog of Galactic β Cephei Stars". The Astrophysical Journal Supplement Series 158 (2): 193–216. doi:10.1086/429408. ISSN 0067-0049. Bibcode: 2005ApJS..158..193S. 
  14. ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M. 



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