Masers associated with two carbon stars - V778 Cygni and EU Andromedae

Astronomy and Astrophysics – Astronomy

Scientific paper

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Carbon Stars, Hydroxyl Emission, Stellar Envelopes, Stellar Spectra, Water Masers, Binary Stars, Infrared Astronomy Satellite, M Stars, Maser Outputs

Scientific paper

The authors present several observations of the 22.2 GHz H2O maser line from two C stars, V778 Cyg and EU And, and the 1665/67 MHz OH maser lines from V778 Cyg. For both sources the intensity of the H2O line has varied by more than a factor of 5 over several months. The authors interpret the systems as being binaries, each with an M star component with a thick shell and a C star component.

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