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]
| 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 mas[1] |
| Distance | approx. 2,000 ly (approx. 600 pc) |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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.[7]
References
edit- ^ a b c d e 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, S2CID 18759600
- ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
- ^ 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, S2CID 53698151
- ^ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W
- ^ 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: 49, Bibcode:2002hrxs.confE..49W
- ^ 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, S2CID 119298524, 61
- ^ Humphreys, R. M. (1978-12-01). "Studies of luminous stars in nearby galaxies. I. Supergiants and O stars in the Milky Way". The Astrophysical Journal Supplement Series. 38: 309–350. Bibcode:1978ApJS...38..309H. doi:10.1086/190559. ISSN 0067-0049.
External links
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