Observations of Alpha Orionis, R Aquilae, and R Aquarii at 14.9 GHz

Astronomy and Astrophysics – Astronomy

Scientific paper

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M Stars, Radio Astronomy, Supergiant Stars, Variable Stars, Chromosphere, Continuous Radiation, Ionized Gases, Mira Variables, Stellar Mass Ejection, Stellar Models

Scientific paper

The 14.9-GHz continuum flux densities of the M-type stars Alpha Ori, R Aql, and R Aqr have been measured. For Alpha Ori and R Aql it is suggested that the emission at this frequency is primarily due to ionized gas associated with stellar chromospheres or coronae. For R Aqr a model consistent with available data is proposed in which the variable intensity of the radio emission depends on a variable mass-loss rate for the Mira.

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