A discussion on the mass loss formulae for OH/IR stars |
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| Authors: | Xiong Guan-zhu Chen Pei-sheng |
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| Institution: | Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China |
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| Abstract: | It is found that the mass loss rate derived from S25/S12 is generally greater than that from the OH flux. This suggests an increasing loss rate with time. It is found that the gas-to-dust ratio decreases during the evolution Of OH/IR stars. An empirical relation between the gas-to-dust ratio and the dust mass loss rate is derived, leading to a formula for calculating the total mass loss rate directly from the IRAS 60 μm flux. OH/IR stars with silicate emission have a larger range of mass loss ratio, from 10?7 to 10?5 M /yr; those with silicate absorption, a smaller range between 10?5 and 10?4 M/yr. So a large increase in the mass loss rate takes place during the emission phase. |
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| Keywords: | OH/IR stars mass loss rate gas/dust ratio |
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