Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-06-24
Astron.J.126:1896,2003
Astronomy and Astrophysics
Astrophysics
11 page, 10 figures (figure3 in jpeg format), Astronomical Journal - Accepted
Scientific paper
10.1086/377619
We report the discovery of a young massive stellar cluster embedded in an extended HII region, invisible at optical wavelengths where the extinction is $A_V \approx 28$ magnitudes, associated with the IRAS source 16177-5018. $J, H$ and nb$K$ imaging photometry combined with the $K_S$ 2MASS data show the presence of sources with infrared excess emission at 2.2 $\mu$m, concentrated in an area of about one square parsec around a massive young stellar object identified as the IRAS source. This object has a near-mid infrared spectral index betweem 2.2 and 25 $\mu$m $\alpha({\rm IR}) = d {\rm log}(\lambda F_\lambda)/d {\rm log} \lambda $ =4.78, characteristic of compact H II regions, with bolometric luminosity, inferred from the integrated near to far-infrared flux density of $2.8 \times 10^5 L_\odot$, which corresponds to a ZAMS star of about $42 M_\odot$. From the color-magnitude diagram we were able to classify the majority of the cluster members as reddened massive stars earlier than spectral type B5.
Abraham Zulema
Daniel Lepine Jacques Raymond
Roman-Lopes Alexandre
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