Water Vapour Masers in the Mira Variable U Herculis

Details Water Vapour Masers in the Mira Variable U Herculis Water Vapour Masers in the Mira Variable U Herculis

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aspc..445..375w&link_type=abstract

Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants. Proceedings of a conference held at University Ca

Astronomy and Astrophysics

Astronomy

Scientific paper

The H2O maser line at 22 GHz from the Mira variable U Her has been monitored for more than 20 years. Additional interferometric observations were made at four epochs covering a period of 3 years. We found that the maser components have an average lifetime of 0.5-1 year and are distributed in a ring with distances from 12 to 25 AU from the star. The strongly varying shape of the single-dish maser spectra is the result of a superposition of many short-lived maser components with randomly varying intensities. The integrated flux is dominated by the random variations but varies also in response to the large-amplitude light variations with a period of 406 days.

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