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The physical conditions of the interstellar medium and stellar components in the regions of the southern Galactic star forming complexes associated with IRAS 10049-5657 and IRAS 10031-5632 have been investigated. These regions have been mapped simultaneously in two far infrared bands lambda_eff ~ 150 & 210 micron, with ~ 1 angular resolution using the TIFR 1-m balloon borne telescope. Spatial distribution of the temperature of cool dust and optical depth at 200 micron have been obtained. Using the 2MASS sources, the stellar populations of the embedded young clusters have been studied. A rich cluster of OB stars in the IRAS 10049-5657 region has been found with a cluster radius ~ 2 pc. The source in the cluster closest to the IRAS peak, lies above the ZAMS curve of spectral type O5 in the colour-magnitude diagram. Unlike IRAS 10049-5657, a small cluster comprising of a few deeply embedded sources is seen at the location of IRAS 10031-5632. Self consistent radiative transfer modelling aimed at extracting important physical and geometrical details of the two IRAS sources show that the best fit models are in good agreement with the observed spectral energy distributions. The geometric details of the associated cloud and optical depths (at 100 micron) have been estimated. A uniform density distribution of dust and gas is implied for both the sources. In addition, the infrared ionic fine-structure line emission from gas has been modelled for both these regions and compared with data from IRAS-Low Resolution Spectrometer. For IRAS 10049-5657, the observed and modelled luminosities for most lines agree to within a factor of four while for IRAS 10031-5632, we find a discrepancy of a factor of 100.
A multiwavelength study of the star forming regions associated with IRAS 19111+1048 and IRAS 19110+1045 has been carried out. These have been simultaneously mapped in two far infrared bands at lambda_eff ~ 130 and 200 micron with ~1 angular resolutio
Two Galactic star forming regions, one in a very early phase of evolution and another evolved one, associated with the IRAS sources 00338+6312 and 03595+5110 (RAFGL 5111) respectively have been studied in detail. These sources have been mapped simult
The Galactic star forming region in the southern sky, associated with IRAS 09002-4732 has been mapped simultaneously in two far infrared bands (148 & 209 um), with ~ 1 angular resolution. Fifteen sources including IRAS 08583-4719, 08589-4714, 09002-4
A multi-wavelength investigation of the star forming complex IRAS 20286+4105, located in the Cygnus-X region, is presented here. Near-infrared K-band data is used to revisit the cluster / stellar group identified in previous studies. The radio contin
We present infrared and radio continuum observations of S 201 star forming region. A massive star cluster is observed in this region, which contains different classes of young stellar objects. The near-infrared colour-colour and colour-magnitude diag