Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..26..180d&link_type=abstract
XI IAU Regional Latin American Meeting of Astronomy (Eds. L. Infante & M. Rubio) Revista Mexicana de Astronomía y Astrofísica (S
Astronomy and Astrophysics
Astronomy
2
Scientific paper
The HII region NGC 6357 shows a very complex structure and it harbors the interesting open cluster Pismis 24 with several O-type stars. Another HII structure known as G353.1+0.7 is located to the eastern side of the nebula. This structure can be described like a Strömgren sphere surrounded by a dense dusty molecular shell with finger-like gaseous features pointing to the location of the O stars which demonstrates that these stars are the main ionizing source in the area. In this work we report new spectral types for the brightest stars projected in the cavity of G353.1+0.7. Among them, two are classified as early O-type stars: N49, O4 III((f*)) and N51, O3.5 V((f)), while two other cluster members belong to spectral types O9 V (N50) and B1 V-III (N70). We also discuss UBV photometry for stars in the area leading to the discovery of a young open cluster. >From the spectroscopic parallax of the early-type stars and MS fitting, we derive a DM ˜ 11.9+/-0.25 (2.4 kpc) in agreement with the value found by Massey et al. (2001), DM ˜ 12.0 for the Pismis 24 open cluster. This indicates that G353.1+0.7 and Pis 24 belong to the same HII complex. The star density in the core of the cluster (around N49) reaches 40 stars per arcmin^{-2} at V band and an inspection of the CM-D suggest the presence of a population of PMS stars.
Barba Rodolfo
Damke Guillermo
Morrell Nidia I.
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