• DOI:10.1088/0004-637X/785/1/46
• Corpus ID: 17085548

CHARA/MIRC OBSERVATIONS OF TWO M SUPERGIANTS IN PERSEUS OB1: TEMPERATURE, BAYESIAN MODELING, AND COMPRESSED SENSING IMAGING

@article{Baron2014CHARAMIRCOO,
  title={CHARA/MIRC OBSERVATIONS OF TWO M SUPERGIANTS IN PERSEUS OB1: TEMPERATURE, BAYESIAN MODELING, AND COMPRESSED SENSING IMAGING},
  author={F. Baron and John D. Monnier and L{\'a}szl{\'o} L. Kiss and Hilding R. Neilson and M. Zhao and M. Anderson and Alicia N. Aarnio and Ettore Pedretti and Nathalie D. Thureau and Theo A. ten Brummelaar and Stephen T. Ridgway and Harold A. Mcalister and Judit Sturmann and Laszlo Sturmann and Nils H. Turner},
  journal={The Astrophysical Journal},
  year={2014},
  volume={785}
}

• F. Baron, J. Monnier, +12 authors N. Turner
• Published 25 March 2014
• Physics
• The Astrophysical Journal

Two red supergiants (RSGs) of the Per OB1 association, RS Per and T Per, have been observed in the H band using the Michigan Infra-Red Combiner (MIRC) instrument at the CHARA array. The data show clear evidence of a departure from circular symmetry. We present here new techniques specially developed to analyze such cases, based on state-of-the-art statistical frameworks. The stellar surfaces are first modeled as limb-darkened disks based on SATLAS models that fit both MIRC interferometric data and publicly available spectrophotometric data. Bayesian model selection is then used to determine the most probable number of spots. The effective surface temperatures are also determined and give further support to the recently derived hotter temperature scales of RSGs. The stellar surfaces are reconstructed by our model-independent imaging code SQUEEZE, making use of its novel regularizer based on Compressed Sensing theory. We find excellent agreement between the model-selection results and the reconstructions. Our results provide evidence for the presence of near-infrared spots representing about 3%–5% of the stellar flux.