Star formation in 30 Doradus
Guido De Marchi, Francesco Paresce, Nino Panagia, Giacomo Beccari,, Loredana Spezzi, Marco Sirianni, Morten Andersen, Max Mutchler, Bruce Balick,, Michael A. Dopita, Jay A. Frogel, Bradley C. Whitmore, Howard Bond, Daniela, Clazetti, C. Marcella Carollo, Michael J. Disney

TL;DR
This study uses Hubble observations to analyze the stellar populations in 30 Doradus, revealing differential extinction, identifying pre-main sequence stars, and indicating prolonged star formation with spatial distribution influenced by massive stars.
Contribution
It provides a detailed characterization of PMS stars and their ages in 30 Doradus, highlighting the extended star formation history and effects of massive stars on circumstellar discs.
Findings
Approximately 1150 PMS stars identified with Halpha excess.
Star formation in 30 Doradus spans up to 30 million years.
Older PMS stars are less common near the cluster center.
Abstract
Using observations obtained with the Wide Field Camera 3 (WFC3) on board the Hubble Space Telescope (HST), we have studied the properties of the stellar populations in the central regions of 30 Dor, in the Large Magellanic Cloud. The observations clearly reveal the presence of considerable differential extinction across the field. We characterise and quantify this effect using young massive main sequence stars to derive a statistical reddening correction for most objects in the field. We then search for pre-main sequence (PMS) stars by looking for objects with a strong (> 4 sigma) Halpha excess emission and find about 1150 of them over the entire field. Comparison of their location in the Hertzsprung-Russell diagram with theoretical PMS evolutionary tracks for the appropriate metallicity reveals that about one third of these objects are younger than ~4Myr, compatible with the age of the…
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Taxonomy
TopicsAstronomy and Astrophysical Research
