26 Canis Majoris

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Template:Short description

26 Canis Majoris
File:MMCMaLightCurve.png
A light curve for MM Canis Majoris from Hipparcos data, adapted from Aerts et al. (1999)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Major
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 5.89[3] or (5.84 – 5.87)[4]
Characteristics
Spectral type B2 IV/V[5]
B−V Template:Engvar Script error: No such module "val".[6]
Variable type SPB[4]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[6] km/s
Proper motion (μ) RA: −5.678[2] mas/yr
Dec.: +8.929[2] mas/yr
Parallax (π)3.2442±0.0841 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−1.11[6]
Details
MassScript error: No such module "val".[7] Template:Solar mass
Radius3.25[3] Template:Solar radius
LuminosityScript error: No such module "val".[7] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[8] cgs
TemperatureScript error: No such module "val".[8] K
RotationScript error: No such module "val".[7]
Rotational velocity (v sin i)Script error: No such module "val".[8] km/s
AgeScript error: No such module "val".[9] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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26 Canis Majoris is a variable star in the southern constellation of Canis Major,[10] located around 1,010 light years away from the Sun.[2] It has the variable star designation MM Canis Majoris; 26 Canis Majoris is the Flamsteed designation.[10] This object is visible to the naked eye as a dim, blue-white hued star with a baseline apparent visual magnitude of 5.89.[3] It is moving further from the Earth with a heliocentric radial velocity of +22 km/s.[6]

With a stellar classification of B2 IV/V,[5] it appears as a B-type main-sequence star intermixed with traits of an evolving subgiant star. The brightness of the star was found to be variable when the Hipparcos data was analyzed. It was given its variable star designation in 1999.[11] Samus et al. (2017) classify it as a slowly pulsating B-type variable star (SPB), which ranges from magnitude 5.84 down to 5.87 with a rotationally-modulated period of 2.72945 days.[4] Briquet et al. (2007) describe it as a chemically peculiar He-variable star, having inhomogeneous distributions of chemical elements across its surface. It has a variable, quasi-dipolar magnetic field, resulting in variations of the magnetic field and line strengths as it rotates.[7]

This star is around 3.6[9] million years old with a rotation period of 2.7 days.[7] It has 5.5[7] times the mass of the Sun and 3.25[3] times the Sun's radius. The star is radiating 1,000[7] times as much luminosity as the Sun from its photosphere at an effective temperature of 16,157 K.[8]

References

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  10. ↑ a b c Template:Cite simbad
  11. ↑ Script error: No such module "Citation/CS1".

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Template:Stars of Canis Major

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