Omicron1 Canis Majoris

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Template:Short description

Template:Other stars by Bayer designation

ο1 Canis Majoris
Template:Location mark
Location of ο2 CMa (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Major
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.87[2] (3.78 - 3.99[3])
Characteristics
Evolutionary stage Red supergiant
Spectral type K2.5 Iab[4]
U−B Template:Engvar +1.99[2]
B−V Template:Engvar +1.73[2]
Variable type Slow irregular variable (Lc)[3]
Astrometry
Radial velocity (Rv)+36.3[5] km/s
Proper motion (μ) RA: −3.771 mas/yr[1]
Dec.: 4.503 mas/yr[1]
Parallax (π)1.2869±0.1209 mas[1]
DistanceScript error: No such module "val". ly
(Script error: No such module "val". pc)[6]
Absolute magnitude (MV)−4.69[4]
Details
Mass7.83 ± 2.0[7] Template:Solar mass
Script error: No such module "val".[8] Template:Solar mass
18[9] Template:Solar mass
Radius390[10] Template:Solar radius
Luminosity37,414[10] Template:Solar luminosity
Temperature4,015[10] K
Metallicity [Fe/H]−0.11[11] dex
Rotational velocity (v sin i)12.31[12] km/s
Age18[9] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
16 Canis Majoris, HR 2580, HD 50877, CD−24°4567, HIP 33152, SAO 172542, GC 9059
Database references
SIMBADdata

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Omicron1 Canis Majoris (ο1 CMa, ο1 Canis Majoris) is a red supergiant star in the constellation Canis Major. It is also a variable star.

Name

Johann Bayer gave two adjacent stars the Bayer designation of ο Canis Majoris in 1603, but without distinguishing between the stars. John Flamsteed gave the two omicron stars his own numbered designations of 16 and 24 Canis Majoris in the early 18th century.[13] Friedrich Wilhelm Argelander labelled the stars as ο1 and ο2 in his atlas Uranometria Nova.[14] Nicolas Louis de Lacaille labelled it c Canis Majoris, but this was not upheld by subsequent cartographers.[15] Its Henry Draper Catalogue designation is HD 50877. The two Omicron stars marked the centre of the Great Dog's body on Bayer's 1603 Uranometria.[16]

Distance

File:Ómicron1 Canis Majoris.jpg
Ómicron1 Canis Majoris from Huesca, Spain. March 13, 2021.

The distance to ο1 Canis Majoris is uncertain. It is strongly associated with the Collinder 121 stellar association, located around 3,500 light years (1,085 parsecs) distant.[17] Its original Hipparcos parallax placed it at 610 pc, similar to the distance of EZ Canis Majoris, another member of Cr 121. ο1 CMa appears to be interacting with the nebula around EZ CMa, implying the two are at the same distance.Script error: No such module "Unsubst". However, the revised Hipparcos parallax is only 0.22 mas, with a large margin of error of 0.43 mas,[18] so the distance is not well-defined but likely to be large. The distance to EZ CMa is now thought to be around 1,500 pc.[19] Conversely, though only separated by 2 degrees from the blue supergiant ο2 Canis Majoris, the two appear to be unrelated.[9]

Bailer-Jones et al. (2021) estimate a distance of 820Script error: No such module "String".parsecs, give or take 74Script error: No such module "String".parsecs to Omicron1 Canis Majoris, using a method that use its parallax from Gaia EDR3, its color and apparent magnitude.[6]

Description

File:Omicron1CMaLightCurve.png
A light curve for Omicron1 Canis Majoris, plotted from Hipparcos data[20]

The star itself is an orange K-type supergiant of spectral type K2.5 Iab and is an irregular variable star, varying between apparent magnitudes 3.78 and 3.99. A cool star, its surface temperature is around 4,000 K.[10] Around 8 times as massive as the Sun[7] with around 390 times its diameter, it shines with 37,000 times its luminosity.[10] Interstellar dust only obscures it slightly, and its apparent magnitude is 0.16 fainter than it would be if unobscured.[4] Thought to be around 18 million years old, ο1 Canis Majoris is undergoing nuclear fusion of helium in its core to generate energy and will one day explode as a type II supernova.[9]

References

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  1. ↑ a b c d Template:Cite Gaia DR3
  2. ↑ a b c Script error: No such module "Citation/CS1".
  3. ↑ a b Script error: No such module "Citation/CS1".
  4. ↑ a b c Script error: No such module "Citation/CS1".
  5. ↑ Script error: No such module "Citation/CS1".
  6. ↑ a b Script error: No such module "Citation/CS1". Data about this star can be seen here.
  7. ↑ a b Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1". o1 Canis Majoris' database entry at VizieR.
  9. ↑ a b c d Script error: No such module "citation/CS1".
  10. ↑ a b c d e Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1".
  12. ↑ Script error: No such module "Citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "Citation/CS1".
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Wagman, p. 504.
  17. ↑ Script error: No such module "Citation/CS1".
  18. ↑ Script error: No such module "Citation/CS1".
  19. ↑ Script error: No such module "Citation/CS1".
  20. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Canis Major

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