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• W4288338733 abstract "The purpose of this work is to present an extensive grid of dynamical atmosphere and wind models for M-type AGB stars, covering a wide range of relevant stellar parameters. We used the DARWIN code, which includes frequency-dependent radiation-hydrodynamics and a time-dependent description of dust condensation and evaporation, to simulate the dynamical atmosphere. The wind-driving mechanism is photon scattering on submicron-sized Mg$_2$SiO$_4$ grains. The grid consists of $sim4000$ models, with luminosities from $L_star=890,{mathrm{L}}_odot$ to $L_star=40000,{mathrm{L}}_odot$ and effective temperatures from 2200K to 3400K. For the first time different current stellar masses are explored with M-type DARWIN models, ranging from 0.75M$_odot$ to 3M$_odot$. The modelling results are radial atmospheric structures, dynamical properties such as mass-loss rates and wind velocities, and dust properties (e.g. grain sizes, dust-to-gas ratios, and degree of condensed Si). We find that the mass-loss rates of the models correlate strongly with luminosity. They also correlate with the ratio $L_*/M_*$: increasing $L_*/M_*$ by an order of magnitude increases the mass-loss rates by about three orders of magnitude, which may naturally create a superwind regime in evolution models. There is, however, no discernible trend of mass-loss rate with effective temperature, in contrast to what is found for C-type AGB stars. We also find that the mass-loss rates level off at luminosities higher than $sim14000,{mathrm{L}}_odot$, and consequently at pulsation periods longer than $sim800$ days. The final grain radii range from 0.25 micron to 0.6 micron. The amount of condensed Si is typically between 10% and 40%, with gas-to-dust mass ratios between 500 and 4000." @default.
• W4288338733 created "2022-07-29" @default.
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• W4288338733 date "2019-06-01" @default.
• W4288338733 modified "2023-09-29" @default.
• W4288338733 title "An extensive grid of DARWIN models for M-type AGB stars" @default.
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• W4288338733 doi "https://doi.org/10.1051/0004-6361/201935366" @default.
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