Maser Studies in Evolved Stars
Abstract
High resolution maps of maser emission provide very detailed information on processes occurring in circumstellar envelopes of late-type stars. A particularly detailed picture of the innermost shells around AGB stars is provided by SiO masers. Considerable progress is being made to provide astrometrically aligned multi-transition simultaneous observations of these masers, which are needed to better constrain the models. In view of the large amount of high quality data available, models should now be developed to fully explain all maser characteristics together (spatial distribution, variability, etc). New generation instruments (VERA, VSOP-2), new observational techniques (frequency-phase transfer), and new models promise important improvements of our knowledge on this topic.
Cite
@article{arxiv.0906.0209,
title = {Maser Studies in Evolved Stars},
author = {Francisco Colomer},
journal= {arXiv preprint arXiv:0906.0209},
year = {2009}
}
Comments
Review talk, to be published in the proceedings of "The 9th European VLBI Network Symposium on The role of VLBI in the Golden Age for Radio Astronomy and EVN Users Meeting", September 23-26, 2008, Bologna, Italy; Proceedings of Science, eds Mantovani et al.; 8 pages