Understanding the evolution and dust formation of carbon stars in the Large Magellanic Cloud via the JWST

Context. Carbon stars have been, and still are, extensively studied. Given their complex internal structure peculiar chemical composition, they are living laboratories in which we can test stellar evolution theories of evolved stars. Furthermore, the most relevant dust manufacturers, thus playing a crucial role galaxies. Aims. We aim to study mineralogy circumstellar envelope carbon Large Magellanic Cloud (LMC) achieve better understanding formation process outflow these objects. intend investigate expected distribution observational planes built with filters Mid-Infrared Instrument (MIRI) mounted onboard James Webb Space Telescope (JWST) select best allowing an exhaustive characterisation Methods. compared synthetic spectral energy distributions, obtained by modelling asymptotic giant branch wind, spectra LMC, taken Infrared Spectrograph Spitzer Telescope. From detailed comparison between observation characterise individual sources derive envelope. Results. The sample considered here is composed diverse mass, epoch, degree obscuration, metallicity. find that precipitation MgS on SiC seeds common all non-metal-poor Solid dominant component, percentages above 80% cases; percentage 10% 20% under form graphite, remaining being amorphous carbon. Regarding based MIRI filters, colour-magnitude ([ F 770 W ]–[ 1800 ], [ ]) plane allows obscuration stars, while 2550 diagram discrimination among different metallicities.