Journal
ASTROPHYSICAL JOURNAL
Volume 785, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/785/1/46
Keywords
stars COLFAML; fundamental parameters; starspots; supergiants; techniques COLFAML; image processing; techniques COLFAML; interferometric
Categories
Funding
- National Aeronautics and Space Administration and the National Science Foundation
- STFC [ST/J001651/1] Funding Source: UKRI
- Direct For Mathematical & Physical Scien [1210972] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1211929, 1445935, 807664] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [1210972] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/J001651/1] Funding Source: researchfish
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available