SIMBAD references

We present an infrared photometric study of the star formation region associated to IRAS 05358+3543, hereafter designated S233 IR. Several manifestations of star formation activity are present in S233 IR: masers, molecular outflow, GMC core, YSOs, young stellar clusters and an IRAS source. The paper includes photometric J, H, K and H₂ (2.12µm) images and scanning Fabry-Perot observations to study H₂ kinematics. In the 3.6'x3.6'observed field, two distinct young stellar clusters separated by 0.5 pc are found, one being much redder than the other by A_V∼7mag. A collection of PMS objects and several H₂ nebulosities associated to the younger and redder NE cluster are found. Two deeply embedded jet/counter-jet structures, produced by shocked H₂ gas, are detected near the core of the molecular outflow. Possible exciting source candidates of the molecular outflow and H₂ nebula are discussed. The velocity field of H₂ gas shows that the bulk of the emission occurs within -36.9 to 2.3km/s. Individual spectra of H₂ nebulosities show peak velocities consistent with the rest velocity of the GMC and H₂O maser peak velocities. Luminosity function histograms are used to obtain a crude age estimate for cluster and field stars: ≲2 Myr for NE cluster, 3 Myr for SW cluster and 6 Myr for field (distributed population) stars; indicating at least two star formation stages and a distributed population of young stars. Finally, from PMS isochrones and NIR photometry, taking care of completeness limits, we estimate stellar masses to study the IMF. A turnover for low-mass-stars is found for the SW cluster, while field stars show a Salpeter IMF.