Simultaneous 3mm and 7mm Observations of SiO Masers around R Cassiopeiae: The Maser Line Ratios
Abstract
We present dual-transition (J = 1 → 0 and J = 2 → 1) images for R Cassiopeiae. Line ratios and limits for the J = 1 → 0 and J = 2 → 1 emission vary from roughly unity to several hundred to one. Local velocity trends can be seen in the VLBI images. These new, specific comparisons of rotational transitions show promise for testing emission models, and should be used to incisively probe the physical processes at the base of AGB star mass-loss envelopes.
- Publication:
-
Proceedings of the 6th EVN Symposium
- Pub Date:
- June 2002
- Bibcode:
- 2002evn..conf..231P