|Green Light from AGB StarS (GLASS)
|Ejecta of low to intermediate mass stars dominate the total mass that is re-injected by stars into the interstellar medium (ISM). Nevertheless, the mechanisms at the origin of the mass-loss of these stars are still not completely understood and their mass-loss history is still unknown. The problem is especially acute for the oxygen-rich evolved stars, for which theoretical models can still not predict the acceleration of the observed stellar winds. During the last decade, new evidence arose from various wavelength domains that the mass-loss is varying in time, and is spatially structured, rather than constant and isotropic. In particular, Decin et al. (2011) analyse the structures revealed by Herschel-PACS around CW Leo, up to distances about five times larger than any structures that could be revealed with the VLT (FORS1). They show that the PACS green band (100 microns) is critically important to detect the complex density structure in the circumstellar material around CW Leo. Detailed studies of the exact structure of the circumstellar material is of course crucial to set constraints on the mechanisms at the onset of mass-loss. Consequently, we propose to observe five objects at 100 microns with Herschel-PACS. Four of these objects are oxygen-rich, and all five have already revealed complex circumstellar structures at 70 or 160 microns, or in the sub-mm wavelength domain.
|The Nearby Evolved Stars Survey II: Constructing a volume-limited sample and first results from the James Clerk Maxwell Telescope . Scicluna P. et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2022MNRAS.512.1091S ,
|Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
|Publisher And Registrant
|European Space Agency
|European Space Agency, 2013, GT2_proyer_2, SPG v14.2.0. https://doi.org/10.5270/esa-f2dkj2t