A comparison between CO-, OH-, and IR-mass-loss rates of evolved stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Asymptotic Giant Branch Stars, Carbon Monoxide, Carbon Stars, Hydroxyl Emission, Infrared Stars, Stellar Evolution, Stellar Mass Ejection, Color-Color Diagram, Stellar Envelopes, Stellar Luminosity, Stellar Spectra

Scientific paper

Mass rates of AGB stars with oxygen-rich circumstsellar shells are compared with AGB stars with carbon-rich shells, using three methods to derive mass loss rates: interpretation of (thermal) CO(1 - 0), CO(2 - 1) line profiles; interpretation of OH(1612 MHz) maser line profiles; and IR model fits. Mass loss rates found from these methods are compared with each other in terms of the tau(s) value, which is the ratio between the total momentum in the wind and the total momentum represented by the stellar luminosity. It is found that, for oxygen-rich shells, the value of tau(s) exceeds unity for a large number of sources, while for carbon-rich shells this happens only for a small number of sources. It is proposed that, in oxygen-rich shells, the 9.7 micron silicate feature is responsible for high values of tau(s).

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