Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-11-23
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
2 pages, to be published in ASP Conference Proceedings of the Vienna conference "Why Galaxies Care About AGB Stars II"
Scientific paper
We present the methodology and some preliminary results of our study of the relationship between a Mira's pulsating photosphere and its surrounding molecular layer(s) throughout several pulsation cycles, based on spatially resolved data. Our dataset consists of archival narrow-band observations in the near-infrared H and K bands obtained with the Palomar Testbed Interferometer between 1999 and 2006, extended with a few nights of VLTI AMBER low spectral resolution data and near-infrared SAAO photometry. The fitted model is the geometric star + layer model proposed by Perrin et al. (2004), in which the physical parameters (diameter and temperature of star and layer; wavelength dependent optical depth of the layer) are given a sinusoidal time dependence.
Acke Bram
Degroote Pieter
Hillen Michel
Verhoelst Tijl
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