A sensitive search for methanol line emission toward evolved stars
Abstract
We present a sensitive search for methanol line emission in evolved stars at 1 cm, aiming to detect, for the first time, methanol masers in this type of objects. Our sample comprised post-AGB stars and young planetary nebulae (PNe), whose mass-loss processes and circumstellar structures resemble those of young stellar objects (YSOs), where methanol masers are detected. Class I masers were searched for in 73 objects, whereas Class II ones were searched in 16. No detection was obtained. The non-detection of Class I methanol masers indicated that methanol production in dust grains and/or the enhancement of its gas-phase abundance in the shocked regions of evolved objects are not as efficient as in YSOs. We suggest that relatively more evolved PNe might have a better probability of harboring Class II masers.
Keywords
Cite
@article{arxiv.1401.6913,
title = {A sensitive search for methanol line emission toward evolved stars},
author = {J. F. Gomez and L. Uscanga and O. Suarez and J. R. Rizzo and I. de Gregorio-Monsalvo},
journal= {arXiv preprint arXiv:1401.6913},
year = {2014}
}
Comments
11 pages, no figure. Accepted by Revista Mexicana de Astronomia y Astrofisica. Errors corrected during proof revision