HD 206267

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.[5]

HD 206267A
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension  21h 38m 57.61881s[1]
Declination +57° 29′ 20.5399″[1]
Apparent magnitude (V) 5.70[2]
Characteristics
Spectral type O6V((f)) + O9V[3]
U−B color index −0.72[2]
B−V color index +0.22[2]
Astrometry
Radial velocity (Rv)-7.8[4] km/s
Proper motion (μ) RA: -1.25[1] mas/yr
Dec.: −4.58[1] mas/yr
Parallax (π)1.65 ± 0.63[1] mas
Distanceapprox. 2,000 ly
(approx. 600 pc)
Other designations
BD+56 2617, FK5 813, HD 206267, HIP 106886, HR 8281.
Database references
SIMBADdata

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.[6]

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357
  2. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
  3. Saurin, T. A.; et al. (April 2012), "The embedded cluster or association Trumpler 37 in IC 1396: a search for evolutionary constraints", Monthly Notices of the Royal Astronomical Society, 421 (4): 3206–3216, arXiv:1201.2704, Bibcode:2012MNRAS.421.3206S, doi:10.1111/j.1365-2966.2012.20541.x
  4. Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W
  5. Wojdowski, P. S.; et al. (December 2002), "The Hot Star Triplet HD 206267A", High Resolution X-ray Spectroscopy with XMM-Newton and Chandra, Proceedings of the international workshop held at the Mullard Space Science Laboratory of University College London, Holmbury St Mary, Dorking, Surrey, UK, October 24–25, 2002, Bibcode:2002hrxs.confE..49W
  6. Nakano, M.; et al. (March 2012), "Wide-field Survey of Emission-line Stars in IC 1396", The Astronomical Journal, 143 (3): 14, arXiv:1201.2761, Bibcode:2012AJ....143...61N, doi:10.1088/0004-6256/143/3/61, 61


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