Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-09-27
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
1 page; IAU Highlights of Astronomy, vol 15 (SpSp1 IR and Sub-mm Spectroscopy a New Tool for Studying Stellar Evolution)
Scientific paper
Molecules and dust are formed in and around the asymptotic giant branch (AGB) stars and supernovae (SNe), and are ejected into the interstellar medium (ISM) through the stellar wind. The dust and gas contain elements newly synthesised in stars, thus, dying stars play an important role on chemical enrichment of the ISM of galaxies. However, quantitative analysis of molecules and dust in these stars had been difficult beyond our Galaxy. The high sensitivity instruments on board the Spitzer Space Telescope have enabled us to study dust and molecules in these stars in nearby galaxies. Nearby galaxies have wide range of metallicities, thus the impact of the metallicity on dust and gas production can be studied. This study will be useful for chemical evolution of galaxies from low to high metallicities.
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