HD 206267

{{Starbox begin

| name=HD 206267A

}}

{{Starbox observe

| epoch=J2000

| ra={{RA|21|38|57.61881}}

| dec={{Dec|+57|29|20.5399}}

| appmag_v=5.70

| constell=Cepheus

}}

{{Starbox character

| class={{nowrap|O6V((f)) + O9V}}

| b-v=+0.22

| u-b=−0.72

| variable=

}}

{{Starbox astrometry

| radial_v=−7.8

| prop_mo_ra=−1.25

| prop_mo_dec=−4.58

| parallax=1.65

| p_error=0.63

| parallax_footnote=

| absmag_v=+4.65

}}

{{Starbox orbit

| reference =

| primary = Aa1 (or Aa)

| name = Aa2 (or Ab)

| period_unitless = 3.71 days

| eccentricity = 0.131

| k1 = 186.1

| k2 = 295.5

}}

{{Starbox orbit

| reference =

| primary = Aa (or Aab)

| name = Ab (or Ac)

| period = 143.6

| axis = 0.1

}}

{{Starbox detail

| source =

| component1 = Aa1 (or Aa)

| mass = 27.8

| radius = 11.7

| luminosity = 347,000

| temperature = 41,000

| gravity = 3.75

| metal =

| rotation =

| component2 = Aa2 (or Ab)

| mass2 = 17.7

| radius2 = 5.9

| luminosity2 = 50,119

| temperature2 = 35,500

| gravity2 = 4.14

| metal2 =

| rotation2 =

| age_myr2 = {{val|1.3|1.1}}

}}

{{Starbox detail|no_heading=y

| component1 = Ab (or Ac)

| mass = 10.0

}}

{{Starbox catalog

| names=BD+56 2617, FK5 813, HD 206267, HIP 106886, HR 8281. }}

{{Starbox reference

| Simbad=HD+206267

}}

File:Elephant's Trunk nebula.jpg, 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.

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.

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. In particular, it is surrounded by a loose cluster of stars, Trumpler 37, including a 13th-magnitude star at {{val|1.8|ul="}} and a 7th-magnitude star {{val|12|u="}} away. The cluster may contain over a thounsand stars in total.

References

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