Astronomy and Astrophysics – Astronomy
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aj....127.2817r&link_type=abstract
The Astronomical Journal, Volume 127, Issue 5, pp. 2817-2825.
Astronomy and Astrophysics
Astronomy
11
Ism: Dust, Extinction, Ism: H Ii Regions, Infrared: Stars, Stars: Formation, Stars: Pre-Main-Sequence
Scientific paper
We report the discovery of a young massive stellar cluster and infrared nebula in the direction of the CS molecular cloud associated with the IRAS point source 16132-5039. Analysis of mid-infrared images from the more accurate Midcourse Space Experiment catalog reveals that there are two independent components associated with the IRAS source. The integral of the spectral energy distribution for these components between 8.28 and 100 μm gives lower limits for the bolometric luminosity of the embedded objects of 8.7×104 and 9×103 Lsolar, which correspond to zero-age main-sequence O8 and B0.5 stars, respectively. The number of Lyman continuum photons expected from the stars that lie along the reddening line for early-type stars is about 1.7×1049 s-1, enough to produce the detected flux densities at 5 GHz. The near-infrared spectrum of the nebula increases with frequency, implying that free-free emission cannot be the main source of the extended luminosity, from which we conclude that the observed emission must be mainly dust-scattered light. A comparison of the cluster described in this paper with the young stellar cluster associated with the IRAS source 16177-5018, which is located at the same distance and in the same direction, shows that the mean visual absorption of the newly discovered cluster is about 10 mag smaller and that it contains less massive stars, suggesting that it was formed from a less massive molecular cloud.
Based on observations made at the Laboratório Nacional de Astrofisica, Ministério da Ciência e Tecnologia, Brazil.
Abraham Zulema
Roman-Lopes Alexandre
No associations
LandOfFree
The Stellar Population Associated with the IRAS Source 16132-5039 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Stellar Population Associated with the IRAS Source 16132-5039, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Stellar Population Associated with the IRAS Source 16132-5039 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1179629