HD 206267A is a hierarchical

triple star A star system or stellar system is a small number of stars that orbit each other, bound by gravitational attraction. A large group of stars bound by gravitation is generally called a '' star cluster'' or '' galaxy'', although, broadly speak ...

system in the northern

circumpolar constellation A circumpolar star is a star that, as viewed from a given latitude on Earth, never sets below the horizon due to its apparent proximity to one of the celestial poles. Circumpolar stars are therefore visible from said location toward the nearest po ...

of Cepheus. Two of the members form a

spectroscopic binary A binary star is a system of two star, stars that are gravity, gravitationally bound to and in orbit around each other. Binary stars in the night sky that are seen as a single object to the naked eye are often resolved using a telescope as separa ...

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 The gravitational binding energy of a system is the minimum energy which must be added to it in order for the system to cease being in a gravitationally bound state. A gravitationally bound system has a lower (''i.e.'', more negative) gravitation ...

to the pair. The system is emitting a

stellar wind A stellar wind is a flow of gas ejected from the upper atmosphere of a star. It is distinguished from the bipolar outflows characteristic of young stars by being less collimated, although stellar winds are not generally spherically symmetric. D ...

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 Year 1396 ( MCCCXCVI) was a leap year starting on Saturday (link will display the full calendar) of the Julian calendar. Events January–December * May 19 – Martin I succeeds his brother, John I, as King of Aragon (modern-day ...

. 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 disk A protoplanetary disk is a rotating circumstellar disc of dense gas and dust surrounding a young newly formed star, a T Tauri star, or Herbig Ae/Be star. The protoplanetary disk may also be considered an accretion disk for the star itself, be ...

References

External links

* http://jumk.de/astronomie/big-stars/hd-206267.shtml * Mass Proof https://www.researchgate.net/publication/238537453_The_Components_of_the_HD_206267_A_Triple_Star_System Cepheus (constellation) 206267 8281 Triple star systems O-type main-sequence stars 106886 Durchmusterung objects {{multi-star-stub