A study of OH and H2O masers in the circumstellar envelopes around Miras

Details A study of OH and H2O masers in the circumstellar envelopes around Miras A study of OH and H2O masers in the circumstellar envelopes around Miras

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002evn..conf..219m&link_type=abstract

6th European VLBI Network Symposium on New Developments in VLBI Science and Technology, held in Bonn, June 25th-28th 2002, proce

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We have obtained OH and H2O maser emission map of U Ori using the EVN and MERLIN. We achieve a spatial resolution of about 10 mas for both maser emission lines. Our maps show that H2O masers are found close to the star, in a well-filled shell with an equatorial density enhancement around U Ori. The OH main line masers appear to spread biconically out of the water maser shell along the polar axis. It is possible that greater star light penetration in these directions favours the OH maser population inversion.

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