Proceedings of the International Astronomical Union

Table of Contents - January 2012 - Volume 8, Symposium S287 (Cosmic Masers - from OH to H0)  

Contributed Papers

Preliminary results on SiO v=3 J=1−0 maser emission from AGB stars

J.-F. Desmursa1, V. Bujarrabala1, M. Lindqvista2, J. Alcoleaa1, R. Soria-Ruiza1 and P. Bergmana2

a1 Observatorio Astronómico Nacional, Madrid, Spain. email: [desmurs@oan.es, bujarrabal@oan.es, alcolea@oan.es, r.soria@oan.es

a2 Onsala Space Observatory, Chalmers Univ. of Technology, Sweden email: [michael.lindqvist@chalmers.se, pbergman@chalmers.se]

Abstract

We present the results of SiO maser observations at 43 GHz toward two AGB stars using the VLBA. Our preliminary results on the relative positions of the different J=1–0 SiO masers (v=1,2 and 3) indicate that the current ideas on SiO maser pumping could be wrong at some fundamental level. A deep revision of the SiO pumping models could be necessary.

Keywords

  • Maser;
  • AGB stars