Ground-based infrared observations of variable IRAS sources as candidates for late asymptotic giant branch stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Asymptotic Giant Branch Stars, Giant Stars, Infrared Stars, Late Stars, Space Observations (From Earth), Stellar Mass Ejection, Variable Stars, Hydroxyl Radicals, Infrared Astronomy Satellite

Scientific paper

Analysis of the color distribution of OH/IR stars and IRAS low-resolution spectra class 30 objects suggests the presence of a well-defined evolutionary sequence which is populated by late asymptotic giant branch (LAGB) stars. The paper reports ground-based identification and infrared photometry of 10 candidates of news LAGB stars. None of the selected sources are found to have optical counterparts, and eight of the 10 show a strong 10-micron silicate absorption feature. It is suggested that these stars represent an invisible extension of extreme Mira variables and are some of the most evolved stars observed to date.

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