HD 206267

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Template:Short description

HD 206267A
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus[1]
Right ascension Template:RA[2]
Declination Template:Dec[2]
Apparent magnitude (V) 5.70[3]
Characteristics
Spectral type O6V((f)) + O9V[4]
U−B Template:Engvar −0.72[3]
B−V Template:Engvar +0.22[3]
Astrometry
Radial velocity (Rv)−7.8[5] km/s
Proper motion (μ) RA: −1.25[2] mas/yr
Dec.: −4.58[2] mas/yr
Parallax (π)1.65±0.63 mas[2]
Distanceapprox. Template:Rnd ly
(approx. Template:Rnd pc)
Absolute magnitude (MV)+4.65[1]
Orbit[6]
PrimaryAa1 (or Aa)
CompanionAa2 (or Ab)
Period (P)3.71 days
Eccentricity (e)0.131
Semi-amplitude (K1)
(primary)		186.1 km/s
Semi-amplitude (K2)
(secondary)		295.5 km/s
Orbit[7]
PrimaryAa (or Aab)
CompanionAb (or Ac)
Period (P)143.6 yr
Semi-major axis (a)0.1″
Details[6]
Aa1 (or Aa)
Mass27.8 Template:Solar mass
Radius11.7 Template:Solar radius
Luminosity347,000 Template:Solar luminosity
Surface gravity (log g)3.75 cgs
Temperature41,000 K
Aa2 (or Ab)
Mass17.7 Template:Solar mass
Radius5.9 Template:Solar radius
Luminosity50,119 Template:Solar luminosity
Surface gravity (log g)4.14 cgs
Temperature35,500 K
Metallicity [Fe/H]{{{metal_fe2}}} dex
AgeScript error: No such module "val". Myr
Ab (or Ac)
Mass10.0[7] Template:Solar mass
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
BD+56 2617, FK5 813, HD 206267, HIP 106886, HR 8281.
Database references
SIMBADdata

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File:Elephant's Trunk nebula.jpg
HD 206627 is the brightest star in the centre of the nebula IC 1396, which it ionises.

HD 206267A is a hierarchical triple star system in the northern circumpolar constellation of Cepheus. Two of the members form a spectroscopic binary that orbit each other with a period of 3.7 days, while a third member lies further away—it is unclear whether this third member is gravitationally bound to the pair. The system is emitting a stellar wind that reaches an exceptional velocity of 3,225 km/s, among the highest measured for stars of this type.[8]

This stellar system lies in the nebula IC 1396. All three components are massive stars, and the intense ultraviolet radiation they give off ionizes the gas of IC 1396, and causes compression denser globules of the nebula, leading to star formation. The stellar wind produced by the stars is strong enough to strip nearby stars of their protoplanetary disks.[9]

The system is a member of the Cepheus OB2 stellar association, which notably includes evolved blue and red supergiants such as Nu Cephei, Mu Cephei, and VV Cephei.[10] In particular, it is surrounded by a loose cluster of stars, Trumpler 37,[6] including a 13th-magnitude star at Script error: No such module "val". and a 7th-magnitude star Script error: No such module "val". away.[11] The cluster may contain over a thounsand stars in total.[12]

References

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

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External links

Template:Stars of Cepheus

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