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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.