Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.353t&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the first results of a biased survey of sub-millimetre and FIR CO transitions towards the circumstellar envelopes of AGB and post-AGB stars. This Herschel Guaranteed Time programme uses the HIFI instrument to collect the emission of two CO transitions (J=5-4 and J=9-8) in 74 sources, as well as the J=14-13 transition in the 10 most intense or intriguing sources of the sample. The sample covers most variety of chemistry (carbon-, oxygen-rich, and S-type stars) and evolution (AGB, post-AGB, and OH/IR) in this kind of objects. These observations provide access to the emission of the envelope gas layers in the temperature range ~100 to 2000K. These warm layers are fundamental to the field of stellar evolution because they are the regions where the acceleration of the gas takes place, and therefore where the envelopes are being formed. Because of the significant atmospheric opacity affecting ground-based observations at the corresponding wavelengths, this warm gas could never be probed in a systematic manner over large source samples. Combined to the smaller sample collected by the GTKP HIFISTARS, these data will form an unprecedented catalogue of over 100 AGB and post-AGB stars in two to three fundamental CO lines of the sub-millimetre and FIR domain, and offer a legacy data-base for the modelling of the shaping parameters of evolved stars.
Alcolea Javier
Bujarrabal Valentin
Castro-Carrizo Arancha
Cernicharo Jose
Garcia-Lario Pedro
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