J. M. Oliveira, J. Th van Loon, S. Stanimirovic
Published 2006-09-25Version 1
We present our recent work on the conditions under which star formation occurs in a metal-poor environment, the Large Magellanic Cloud ([Fe/H] ~ -0.4). Water masers are used as beacons of the current star formation in HII regions. Comparing their location with the dust morphology imaged with the Spitzer Space Telescope, and additional Halpha imaging and groundbased near-infrared observations, we conclude that the LMC environment seems favourable to sequential star formation triggered by massive star feedback (Oliveira et al. 2006). Good examples of this are 30 Doradus and N 113. There are also HII regions, such as N 105A, where feedback may not be responsible for the current star formation although the nature of one young stellar object (YSO) suggests that feedback may soon start making an impact. The chemistry in one YSO hints at a stronger influence from irradiation effects in a metal-poor environment where shielding by dust is suppressed (van Loon 2005)
Comments: in "Triggered Star Formation in a Turbulent ISM", IAU symposium, poster contribution; a better quality version of this manuscript can be found at http://www.astro.keele.ac.uk/~jacco/papers/proc.ps a full version of the poster can be found at http://www.astro.keele.ac.uk/~jacco/papers/IAUS237_LMC_2006.pdf
On the origin of nitrogen
HII regions in the spiral galaxy NGC 3389
The thin layer of Warm Ionized Gas: towards a 3-D reconstruction of the spatial distribution of HII regions
