摘要：We analyze sparsely sampled near-infrared (JHK s ) light curves of a sample of 1781 Mira variable candidates inM33, originally discovered using I-band time-series observations. We extend our single-band semi-parametricGaussian 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 ofthe M33 sample into oxygen- or carbon-rich subsets. We derive period–luminosity relations for O-rich Miras anddetermine a distance modulus for M33 of 24.80±0.06 mag.
关键词：distance scale;methods: statistical;stars: AGB and post-AGB;stars: variables: general
