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Título               : The Stellar Population of Galactic Giant H II regions  
Conferencista: Augusto Damineli, IAG/USP  
Data                  : Quarta-feira, 11/04/01 15H30M  
Local                 : Auditório L.B.F. Clauzet - Água Funda  
Sumário           :
We are engaged in a survey of the stellar population of the Galactic giant HII regions. Our technique is based on JHK imaging and K-band spectroscopy to derive spectroscopic parallaxes. This classical method avoids the ambiguity of the kinematic model and the contamination by peculiar velocities, inherent to the radio surveys. In addition the accuracy in distance determination can be continuously improved, as more and more spectra are accumulated.
Our preliminary results for W31, W42, W43, NGC3576 and M17 indicates distances smaller than those from radio techniques. The emerging picture of the far side of the Milky Way is incongruent with the well known Georgelin & Georgelin (1976) plot.
The top end of the IMF seems to be independent of the ambient. A group of luminous, embedded objects is present in every massive star formation region. Those massive YSOs are evolutionary connected with UCH II and may correspond to late-O/early-B stars in active phase of disk accretion, or may be "late comers" early O-type stars.

OBS.: O seminário será proferido em Português com transparências em Inglês.