The chronological sequence of circumstellar masers - Identifying proto-planetary nebulae

Astronomy and Astrophysics – Astronomy

Scientific paper

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Interstellar Masers, Planetary Nebulae, Protoplanets, Stellar Envelopes, Stellar Evolution, Emission Spectra, Infrared Astronomy Satellite, Infrared Radiation, Late Stars, Water Masers

Scientific paper

The trends arising in circumstellar shells due to the presence or absence of various circumstellar masers are studied as a function of the far-infrared colors of the masers. Several of these trends show up most clearly as a dependence of the detection rate for particular masers on the (25-12) micron color, which is correlated with the rate of mass loss. This principle is used to suggest a chronological sequence for the development of a circumstellar envelope which explains most extant observations. The masers exhibited by a shell can then be used to diagnose the current phase. This approach is used to identify OH/IR stars that may be early examples of the protoplanetary nebula phase.

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