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Paper   IPM / Astronomy / 11778
School of Astronomy
  Title:   The UK Infrared Telescope M33 monitoring project. II. The star formation history in the central square kiloparsec
  Author(s): 
1.  Atefeh Javadi
2.  Jacobus van Loon
3.  Mohamad Taghi Mirtorabi
  Status:   To Appear
  Journal: MNRAS
  Pages:   17
  Publisher(s):   MNRAS
  Supported by:            IPM IPM
  Abstract:
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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