Dust formation and wind acceleration around the aluminum oxide-rich AGB star W Hydrae.

ABSTRACT: Dust grains, formed around asymptotic giant branch (AGB) stars, are accelerated by stellar radiation to drive stellar winds, which supply freshly synthesized nuclides to the Galaxy. Silicate is the dominant dust species in space, but ~40% of oxygen-rich AGB stars are thought to have comparable amounts of aluminum oxide dust. Dust formation and the wind-driving mechanism around these oxygen-rich stars, however, are poorly understood. We report on the spatial distributions of AlO and ²⁹SiO molecules around an aluminum oxide-rich M-type AGB star, W Hydrae, based on observations obtained with the Atacama Large Millimeter/submillimeter Array. AlO molecules were only observed within three stellar radii (R_star), whereas ²⁹SiO was distributed in the accelera

SUBMITTER: Takigawa A 

PROVIDER: S-EPMC5665597 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature