The rapidly evolving source OH 5.89 - 0.39 - H II region or proto-planetary nebula?

Astronomy and Astrophysics – Astrophysics

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H Ii Regions, Hydroxyl Emission, Infrared Stars, Planetary Nebulae, Radio Stars, Very Large Array (Vla), Interstellar Masers, Radiant Flux Density, Stellar Luminosity

Scientific paper

VLA observations have shown strong radio continuum emission associated with 5.89-0.39, an object previously known as an OH/IR star. The 1612 MHz OH maser is rapidly disappearing. In this letter the VLA observations are described. The authors discuss the properties of this object, assuming that it is a young Planetary Nebula. Alternative interpretations as a peculiar H II region or a post main sequence massive star are also discussed.

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