The flare in the U Orionis OH maser

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Flare Stars, Hydroxyl Emission, Interstellar Masers, Maser Outputs, Photosphere, Radiative Transfer, Microwave Coupling, Shock Wave Propagation, Stellar Atmospheres, Stellar Evolution, Ultrahigh Frequencies, Variable Stars

Scientific paper

The U Ori OH masers were monitored following the drastic events in these masers in early 1974. The events consisted of the sudden appearance of strong 1612-MHz radiation, coincidentally with the disappearance of the 1667-MHz radiation. They are interpreted in the light of the monitored evolution of the 1612-MHz radiation, the decline in its output level, and the subsequent reemergence of a 1667-MHz line. The conclusion is that the events are the outcome of a short-lived disturbance in the stellar photosphere, most likely a shock wave, which affected the maser through radiative coupling between the photosphere and the OH molecules.

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