CFHT UM2025 - Presentation Details
Abstract Details
Title: Hierarchical Star Formation in the 30 Doradus Region, the Orion Nebula Cluster and Westerlund 1
Presenter: Kenny Chan
Abstract:
30 Dor region is a great target for hierarchical star formation studies because the object is an actively star-forming region (Sun et al., 2017). Hierarchical Star formation without a preferred spatial scale. This was driven by supersonic turbulence in the interstellar medium (ISM). Young star clusters mainly concentrated in spiral arms; old clusters are often found in galactic haloes. Binary clusters seem to be overrepresented in galaxies, is it the case? The fractal dimension (FD) and virial ratio (α_vir) are key to identifying star clusters. Previously, Sun et al. (2017) selected Upper Main Sequence (UMS) stars from the color-magnitude diagram (CMD) of 30 Dor for their analysis. To compare UMS and old stars, 2nd CMD diagram was reproduced, including the UMS selection from Sun et al. (2017). Red Giant Branch (RGB) and Red Clump stars were selected as older comparison samples. In addition, Orion Nebula Cluster (ONC) and Westerlund 1 (WD1) were chosen to find any star clusters in projected LMC distance (50kpc) and real distance in Milky Way. Therefore, the aims of my research are: Main aim: To investigate the hierarchical star formation of 30 Doradus (30 Dor) in the Large Magellanic Cloud (LMC) and the bracket of ONC and WD1. This includes identifying stellar and cluster ages and spatial distributions. Secondary aim: Assess whether binary star clusters are overrepresented compared with standard hierarchical star-formation expectations.