2002AJ....124.2739F -
Astron. J., 124, 2739-2748 (2002/November-0)
The stellar content of obscured galactic giant H II regions. IV. NGC 3576.
FIGUEREDO E., BLUM R.D., DAMINELI A. and CONTI P.S.
Abstract (from CDS):
We present deep, high angular resolution, near-infrared images of the obscured Galactic giant H II region NGC 3576. Our images reach objects to ∼3
M☉. We collected high signal-to-noise
K-band spectra of eight of the brightest objects, some of which are affected by excess emission and some of which follow a normal interstellar reddening law. None of them displayed photospheric features typical of massive OB-type stars. This indicates that they are still enshrouded in their natal cocoons. The
K-band brightest source (NGC 3576 No. 48) shows CO 2.3 µm band head emission, and three others have the same CO feature in absorption. Three sources display spatially unresolved H
2emission, suggesting dense shocked regions close to the stars. We conclude that the remarkable object NGC 3576 No. 48 is an early
B/late O star surrounded by a thick circumstellar disk/envelope. A number of other relatively bright cluster members also display excess emission in the
K-band, indicative of reprocessing disks around massive stars (YSOs). Such emission appears to be common in other Galactic giant H II regions we have surveyed. The initial mass function slope of the cluster, Γ=-1.62, is consistent with Salpeter's distribution and similar to what has been observed in the Magellanic Cloud clusters and in the periphery of our Galaxy.
Abstract Copyright:
∼
Journal keyword(s):
ISM: H II Regions - Infrared Radiation - Stars: Early-Type - Stars: Formation - Stars: Fundamental Parameters
Nomenclature:
Fig.1, Table 2: FBDC NNN N=25 among 315.
Simbad objects:
26
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2002AJ....124.2739F and select 'bookmark this link' or equivalent in the popup menu