Mass loss from OH/IR stars - Models for the infrared emission of circumstellar dust shells

Astronomy and Astrophysics – Astronomy

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Asymptotic Giant Branch Stars, Cosmic Dust, Hydroxyl Emission, Infrared Stars, Stellar Envelopes, Stellar Mass Ejection, Stellar Radiation, Carbon Monoxide, Giant Stars, Infrared Astronomy Satellite, Interstellar Masers, Radiative Transfer, Stellar Spectrophotometry

Scientific paper

The IR emission of a sample of 24 OH/IR stars is modeled, and the properties of circumstellar dust and mass-loss rate of the central star are derived. It is shown that for some sources the observations of the far-IR emission is well fitted with a lambda exp -1 law, while some have a steeper index of 1.5. For a few sources, the presence of circumstellar ice grains is inferred from detailed studies of the observed 10-micron feature. Dust mass-loss rates are determined from detailed studies for all the stars in this sample. They range from 6.0 x 10 exp -10 solar mass/yr for an optically visible Mira to 2.2 x 10 exp -6 solar mass/yr for a heavily obscured OH/IR star. These dust mass-loss rates are compared to those calculated from IRAS photometry using 12-, 25-, and 60-micron fluxes. The dust mass-loss rates are also compared to gas mass-loss rates determined from OH and CO observations. For stars with tenuous shells, a dust-to-gas ratio of 0.001 is obtained.

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