Poster abstract
Optical and Infra-red Survey of the Young Stellar Population Associated with the Star-forming Complex Sh2-252 (NGC 2175)
Abstract
Sh2-252 is a large HII region ionized by the O6.5 star HD 42088, associated with the cluster NGC 2175 and is a part of the Gem OB association. The sub regions Sh2-252 A, B and C of this complex are assumed to be formed as a direct result of the interaction of the massive star HD 42088 with the surrounding molecular cloud. Hence this complex is an ideal target to study the properties of the young stellar objects (YSOs) and initial mass function (IMF) in extreme
star forming conditions. We have performed deep optical imaging survey of the region in the $V$ and $I_c$ bands over an area of $\sim$ $1^{\circ} \times 1^{\circ} $ down to 23 magnitude in $V$. Using the Spitzer-IRAC observations, we identified $\sim$ 500 candidate YSOs (Classes 0/I/II) indicating the richness of this complex with the young stellar population. Spatial distribution of these candidate YSOs shows number of sub clustering across the region and most of them are seem to be obscured in the optical observations. $H{\alpha}$ slitless spectroscopy survey of the region helps identifying over 50 $H{\alpha}$ emitting sources. The location of these candidate YSOs on the $(V-I)/V$ colour-magnitude diagram reveals that $\sim$ 90\% of the YSOs
are seem to have ages $\le$ 5 Myr with a median age of $\sim$ 2-3 Myr and have masses in the range of 0.3 - 2.5 $ M_{\odot}$. The characteristics of the YSOs, evolutionary scenario and IMF of the complex will be discussed in this presentation.
star forming conditions. We have performed deep optical imaging survey of the region in the $V$ and $I_c$ bands over an area of $\sim$ $1^{\circ} \times 1^{\circ} $ down to 23 magnitude in $V$. Using the Spitzer-IRAC observations, we identified $\sim$ 500 candidate YSOs (Classes 0/I/II) indicating the richness of this complex with the young stellar population. Spatial distribution of these candidate YSOs shows number of sub clustering across the region and most of them are seem to be obscured in the optical observations. $H{\alpha}$ slitless spectroscopy survey of the region helps identifying over 50 $H{\alpha}$ emitting sources. The location of these candidate YSOs on the $(V-I)/V$ colour-magnitude diagram reveals that $\sim$ 90\% of the YSOs
are seem to have ages $\le$ 5 Myr with a median age of $\sim$ 2-3 Myr and have masses in the range of 0.3 - 2.5 $ M_{\odot}$. The characteristics of the YSOs, evolutionary scenario and IMF of the complex will be discussed in this presentation.