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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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