Physics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3536s&link_type=abstract
Spitzer Proposal ID #3536
Physics
Scientific paper
The young stellar cluster NGC 6193 lies at a distance of 1.3 kpc in the southern Ara OB1 association, with an estimated age of only 3 My. At this age, roughly half of the lower mass stars in the cluster are expected to be surrounded by disks. Lying at the cluster center are two massive O-type stars (HD 150135 and HD 150136), separated by only 10 arc seconds. Their strong winds and UV radiation fields have very likely affected disk evolution in the surrounding low-mass pre-main sequence population. HD 150136 is a remarkable O5V + O6 binary with a short 2.7 day period, and shows unmistakable wind-shock signatures at both radio and X-ray wavelengths. We propose to undertake the first mid-IR study of NGC 6193 and its central O stars with Spitzer. IRAC and MIPS images will identify those objects that are still surrounded by disks, providing information on disk lifetimes and disk properties in the harsh O-star environment. IRS spectra will yield information on the mass-loss properties of the central O stars that is needed to undertake wind-shock modelling of existing Chandra X-ray spectra.
Damineli Augusto
Palla Francesco
Skinner Stephen
Zhekov Svet
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