“School of Astronomy”
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| Paper IPM / Astronomy / 15422 |
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We analyze sparsely sampled near-infrared (JHK s ) light curves of a sample of 1781 Mira variable candidates in M33, originally discovered using I-band time-series observations. We extend our single-band semi-parametric Gaussian process modeling of Mira light curves to a multiband version and obtain improved period determinations. We use our previous results on near-infrared properties of candidate Miras in the LMC to classify the majority of the M33 sample into oxygen- or carbon-rich subsets. We derive period�??luminosity relations for O-rich Miras and determine a distance modulus for M33 of 24.80 ñ 0.06 mag
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