Gamma Columbae

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Template:Short description

γ Columbae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.366 + 12.664[2]
Characteristics
Spectral type B2.5 IV[3] + G8 V[4]
U−B Template:Engvar −0.66[5]
B−V Template:Engvar −0.18[5]
Variable type Candidate SPB[6]
Astrometry
Radial velocity (Rv)+24.2[7] km/s
Proper motion (μ) RA: −3.24[1] mas/yr
Dec.: +10.21[1] mas/yr
Parallax (π)3.75±0.18 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−2.76[8]
Details[6]
γ Col A
MassScript error: No such module "val". Template:Solar mass
RadiusScript error: No such module "val". Template:Solar radius
Luminosity2,070[9] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[10] cgs
TemperatureScript error: No such module "val".[10] K
Rotational velocity (v sin i)Script error: No such module "val". km/s
AgeScript error: No such module "val".[11] Myr
γ Col B
Mass0.94[2] Template:Solar mass
Temperature5,367[2] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
γ Col, CD−35°2612, HD 40494, HIP 28199, HR 2106, SAO 196352.[12]
Database references
SIMBADdata

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Gamma Columbae, Latinized from γ Columbae, is a possible wide binary star system[2] in the southern constellation of Columba. It is visible to the naked eye with an apparent visual magnitude of 4.36.[5] Based upon an annual parallax shift of 3.75 mas,[1] it is located roughly 870 light years from the Sun.

The primary component is an evolved[6] B-type subgiant star with a stellar classification of B2.5 IV.[3] It is a candidate slowly pulsating B-type star with a mean longitudinal magnetic field strength of Script error: No such module "val"..[6] The star has nearly six times the mass of the Sun and close to five times the Sun's girth.[6] It is radiating over 2,000 times the solar luminosity from its outer atmosphere at an effective temperature of 12,904 K.[9] The estimated age of this star is around 24 million years.[11] At this age, it is thought to be the remnant of a once more massive star that just finished hydrogen fusion, and is undergoing structural readjustment. This process is extremely short, on the order of ten thousand years, making it a rare object.[10]

The visual magnitude 12.664[2] companion is a G-type main sequence star with a classification of G8 V.[4] It lies at an angular separation of 33.8 arc seconds from the primary, which corresponds to a projected physical separation of 8,844 AU.[2] Despite the young age of these stars, there has been no X-ray emission detected.[2]

References

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  5. ↑ a b c Script error: No such module "citation/CS1".
  6. ↑ a b c d e Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ a b Script error: No such module "Citation/CS1".
  10. ↑ a b c Script error: No such module "Citation/CS1".
  11. ↑ a b Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".

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External links

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Template:Stars of Columba

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