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Paper: The 100 Myr Star Formation History of NGC 5471
Volume: 451, 9th Pacific Rim Conference on Stellar Astrophysics
Page: 169
Authors: García-Benito, R.; Pérez, E.; Díaz, '. I.; Apellániz, J. M.; Cerviño, M.
Abstract: Although NGC 5471 has been considered as a classical example of an instantaneous burst of star formation, we show that in addition to the most recent ionizing burst, star formation has been proceeding more or less continuously in NGC 5471 for at least 100 Myr. Using HST/WFPC2 F547M and F675W, ground based JHKs, and GALEX FUV and NUV images, we have conducted a photometric study of the star formation history of this giant HII region in M101. We perform an integrated analysis of the main emission knots and as a whole of NGC 5471, and a photometric study of the color-magnitude diagram (CMD) of the resolved stars. The integrated photometry for the whole region provides 2 different ages, revealing a complex star formation history, confirmed by the CMD resolved stellar photometry analysis. The spatial distribution of the stars shows that the star formation in NGC 5471 has proceeded along the whole region during, at least, the last 50-100 Myr. The current ionizing clusters are enclosed within a large bubble, which is likely to have been produced by the stars that formed ∼20 Myr ago.
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