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In this talk I will present the first results of
an ongoing observational survey performed with OSIRIS at the SOAR
Telescope. It is aimed to verify the existence of a massive stellar
component in the periphery of Westerlund 2 and NGC3603, two of the
most massive young stellar clusters in the Galaxy.
The observations were made in the semester 2011A, and the first
results seems to confirm the existence of massive stellar halos
there.
In case of Westerlund 2, we successfully detected two O2If/WN6ha as
well as several early- to mid-O stars, together with some Be and
luminous blue variable (LBV) candidates. On the other hand, the
first results taken from a more limited NIR spectroscopic campaign
towards the periphery of NGC3603, may indicate the presence of a
massive stellar halo compound mainly by early- to mid-B supergiants.
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