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Paper   IPM / Astronomy / 15422
School of Astronomy
  Title:   Near-infrared Mira Period-Luminosity Relations in M33
1.  Wenlong . Yuan
2.  Lucas . M. Macri
3.  Atefeh . Javadi
4.  Zhenfeng . Lin
5.  Jianhua. Z. Huang
  Status:   Published
  Journal: Astronomical Journal
  Vol.:  156
  Year:  2018
  Supported by:            ipm IPM
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 ± 0.06 mag

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