FN Canis Majoris

FN Canis Majoris

A light curve for FN Canis Majoris from Hipparcos data. Adapted from Rivinius et al. (2011)[1]
Observation data
Epoch J2000.0      Equinox J2000.0
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 mas[2]
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]

  1. ^ Cite error: The named reference Rivinius was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference TjinADjie2001 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Fernandes2019 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference hohle2010 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  9. ^ a b c d e f g Cite error: The named reference Zorec2016 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference hill1967 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference lefevre2009 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference stankov2005 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).