منابع مشابه
The Origin of Massive O - type Field Stars Part II : Field O stars as runaways
In two papers we try to confirm that all Galactic high-mass stars are formed in a cluster environment, by excluding that O-type stars found in the Galactic field actually formed there. In de Wit et al. (2004) we presented deep K-band imaging of 5 arcmin fields centred on 43 massive O-type field stars that revealed that the large majority of these objects are single objects. In this contribution...
متن کاملThe origin of massive O - type field stars II . Field O stars as runaways
In two papers we try to confirm that all Galactic high-mass stars are formed in a cluster environment, by excluding that O-type stars found in the Galactic field actually formed there. In de Wit et al. (2004) we presented deep K-band imaging of 5 arcmin fields centred on 43 massive O-type field stars that revealed that the large majority of these objects are single objects. In this contribution...
متن کاملThe Effective Temperatures of O-type Stars from UV spectroscopy
We present an analysis of high resolution spectra in the far-UV − UV range (∼905-2000Å) with non-LTE, spherical, hydrodynamical, line-blanketed models, of three O-type Galactic stars, and derive their photospheric and wind parameters. These data extend previously analyzed samples and fill a gap in spectral type coverage. The combined sample confirms a revised (downward) Teff scale with respect ...
متن کاملNon-thermal radio emission from O-type stars
HD 167971 is a triple system consisting of a 3.3-day eclipsing binary (O5–8 V + O5–8 V) and an O8 supergiant. It is also a well known non-thermal radio emitter. We observed the radio emission of HD 167971 with the Very Large Array (VLA) and the Australia Telescope Compact Array (ATCA). By combining these data with VLA archive observations we constructed a radio lightcurve covering a 20-yr time-...
متن کاملSpectral analysis of O(He)-type post-AGB stars
We present an analysis of two recently discovered, very hot hydrogen-deficient post-AGB stars of spectral type O(He), namely HS 1522+6615 and HS 2209+8229, by means of state-of-the-art NLTE model atmospheres based on new optical, UV, and X-ray observations. In the spectra of HS 1522+6615 we discovered a variability of the O VI λ 5290Å line complex on a time scale of few days. We also report on ...
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ژورنال
عنوان ژورنال: Nature
سال: 1921
ISSN: 0028-0836,1476-4687
DOI: 10.1038/108209b0