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Yuan, Wenlong; Macri, Lucas M.; Javadi, Atefeh; Lin, Zhenfeng; Huang, Jianhua Z.
The Astronomical journal, 09/2018, Volume: 156, Issue: 3Journal Article
We analyze sparsely sampled near-infrared (JHKs) 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 0.06 mag.
