----- Submission 1 (Thu May 12 20:06:15 GMT 2005) ----- The warning is due to the use of postarg. This is intentional. The post targ is used to cover the fastie finger region and to enlarge the FOV. Assigned ID: 390 ----- Submission 1 (Fri Jan 21 21:20:08 GMT 2005) ----- problem with two affiliations not in the database Charting the Sparkling Star Formation in NGC346 New, stunning V, I images of the youngest and most massive star forming region NGC 346, in the Small Magellanic Cloud, have been recently obtained with the HST/ACS. They reveal a myriad of small compact clusters: some are still embedded in dust, possibly connected by gas and dust filaments. We also discover a rich population of pre-main sequence low mass stars (~3 -0.6 Mo) mainly distributed in the body of NGC 346 and in these compact clusters, which formed with the central cluster (~5My ago), but have not reached the main sequence yet. The immediate question that emerges is: how did star formation occur in this region? Is there evidence for an age spread among these clusters, that could be indicative of sequential star formation? We are, therefore, requesting an immediate follow up investigation with the ACS/HRC to perform a comprehensive UV/U study of the ten largest clusters identified in the NGC 346 region, with the objective of determining, in combination with the already available deep V,I data, their mass function, their upper mass cut-off, whether mass segregation is present, whether there are age variations, and what is the impact of the stellar feedback, with the final aim to establish how star formation has occured and progressed in this low metallicity environment.
We cover eight different regions of star formations. For each position we use two pointing (with pos targ). The first pointing is centered in the cluster itself, the second one is a bit off toward the "fastie" finger. The combination of the two pointing will allow to recover the region masked by the finger and to have a larger FOV. For each pointing the sequence is the following: Short F220W + 3 point dither long F2220W + short F220W Short F330W + 3 point dither long F330W + short F330W. 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