“School of Astronomy”
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| Paper IPM / Astronomy / 11778 |
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We have conducted a near-infrared monitoring campaign at the UK InfraRed Telescope (UKIRT), of the Local Group spiral galaxy M33 (Triangulum). The main aim was to identify stars in the very final stage of their evolution, and for which the luminosity is more directly related to the birth mass than the more numerous less-evolved giant stars that continue to increase in luminosity. In this second paper of the series, we construct the birth mass function and hence derive the star formation history. The star formation rate has varied between 0.002 and 0.007 M �? yr^-1 kpc^-2. We give evidence of two epochs of a star formation rate enhanced by a factor of a few - one that happened 6 Gyr ago and produced 80
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