NOAO >   Observing Info >   Approved Programs >   2013A-0055

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Proposal Information for 2013A-0055


PI: Thomas Lebzelter, University of Vienna, thomas.lebzelter@univie.ac.at
Address: Department of Astrophysics, Tuerkenschanzstrasse 17, Vienna A1180, Austria

CoI: Kenneth Hinkle, NOAO
CoI: Walter Nowotny, University of Vienna

Title: Mass loss along the giant branch

Abstract: The mass loss from stars during their evolution along the Asymptotic Giant Branch is a critical aspect of stellar and galactic evolution. Mass loss rate is a parameter in many types of modeling. However, measuring the mass loss rate remains a challenging task. Existing methods are either limited in their sensitivity (radio measurements) or require the inclusion of free parameters (near- and mid-infrared dust measurements). With this proposal we aim to establish an alternative method for determining the gas outflow from AGB stars using fundamental vibration-rotation lines of CO at 4.6 (micron) measured at high spectral resolution with the Phoenix spectrograph. The major topics addressed will be the change of mass loss with AGB evolution including measuring of low mass loss rates and the detection of multiple circumstellar shells associated with episodic mass loss.


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NOAO >   Observing Info >   Approved Programs >   2013A-0055

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