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Recent observations from the Spitzer Space Telescope enable us to study themid-infrared dust excess of Asymptotic giant branch (AGB) stars in the LargeMagellanic Cloud (LMC). Using mid-infrared spectra, together with photometricdata from the SAGE programme, we establish a colour selection of carbon-richAGB stars with intermediate and high mass-loss rates. We also establishedmass-loss rate versus colour relations for carbon-rich AGB stars. Theintegrated mass-loss rate over all intermediate and high mass-loss ratecarbon-rich AGB candidates in the LMC is 8.5x10^-3 solar mass per year. Thisnumber could be almost doubled if oxygen-rich stars are included. Gas mass-lossrate from these stars is 4-5x10^-4 solar mass per year per kpc2 in the barand1x10^-4 solar mass per year per kpc^2 outside of the bar. AGB stars are oneof the most important dust sources in the LMC, and the dominant gas sourceoutside of the bar. As a consequence of recent increases in the star-formationrate, supernovae are the most important gas source in the LMC bar and around 30Dor. These differences in dust and gas sources impact on the gas-to-dust ratioand dust properties of the local ISM, because the injection from SNe could havea higher gas-to-dust ratio, resulting in a higher gas-to-dust ratio for the ISMin certain regions of the LMC.

Gas and dust budget of the Large Magellanic Cloud