منابع مشابه
Circumstellar discs around solar - mass stars in NGC 6611
We have performed IZJHKL observations in NGC6611, the young cluster that ionises the Eagle Nebula. We have discovered a rich pre-main sequence concentrated around the O-stars in the cluster. As measured by their L-band excesses, at least 58%± 5% of the pre-main sequence objects (0.45M⊙ <M< 2M⊙) have circumstellar discs. By comparing this disc frequency with frequencies determined for regions wh...
متن کاملThe VLT - FLAMES Survey of Massive Stars : Stellar parameters and rotational velocities in NGC 3293 , NGC 4755 and NGC 6611
An analysis is presented of VLT-FLAMES spectroscopy for three Galactic clusters, NGC 3293, NGC 4755 and NGC 6611. Non-LTE model atmosphere calculations have been used to estimate effective temperatures (from either the helium spectrum or the silicon ionization equilibrium) and gravities (from the hydrogen spectrum). Projected rotational velocities have been deduced from the helium spectrum (for...
متن کاملThe massive star binary fraction in young open clusters - II . NGC 6611 ( Eagle Nebula )
Based on a set of over 100 mediumto high-resolution optical spectra collected from 2003 to 2009, we investigate the properties of the O-type star population in NGC 6611 in the core of the Eagle Nebula (M16). Using a much more extended data set than previously available, we revise the spectral classification and multiplicity status of the nine O-type stars in our sample. We confirm two suspected...
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15 صفحه اولMass functions and structure of the young open cluster NGC 6611
We use J, H and KS 2MASS photometry to study colour-magnitude (CMDs) and colour-colour diagrams, structure and mass distribution in the ionizing open cluster NGC 6611. Reddening variation throughout the cluster region is taken into account followed by field-star decontamination of the CMDs. Decontamination is also applied to derive the density profile and luminosity functions in the core, halo ...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2006
ISSN: 0004-6256,1538-3881
DOI: 10.1086/507674