Accession Number : ADA564445


Title :   Molecular and Dusty Layers of Asymptotic Giant Branch Stars Studied with the VLT Interferometer


Descriptive Note : Journal article


Corporate Author : NAVAL OBSERVATORY WASHINGTON DC


Personal Author(s) : Wittkowski, Markus ; Karovicova, Iva ; Boboltz, David A ; Fossat, Eric ; Ireland, Michael ; Ohnaka, Keiichi ; Scholz, Michael ; Wyk, Francois van ; Whitelock, Patricia ; Wood, Peter R ; Zijlstra, Albert A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a564445.pdf


Report Date : Sep 2011


Pagination or Media Count : 6


Abstract : Mass loss from asymptotic giant branch (AGB) stars is the most important driver for the evolution of low to intermediate mass stars towards planetary nebulae. It is also one of the most important sources of chemical enrichment of the interstellar medium. The mass-loss process originates in the extended atmosphere, whose structure is affected by stellar pulsations, and where molecular and dusty layers are formed. Optical interferometry resolves the extended atmospheres of AGB stars and thereby enables us to obtain measurements of the intensity profile across this region. We present an overview of recent results from our spectro-interferometric observations of AGB stars using the near-and mid-infrared instruments AMBER and MIDI of the VLT Interferometer.


Descriptors :   *DUST , *INTERFEROMETRY , *STARS , ATMOSPHERES , ENRICHMENT , LAYERS , MOLECULES , NEBULAE , OPTICAL PROPERTIES , PLANETS , REPRINTS


Subject Categories : Astronomy
      Meteorology


Distribution Statement : APPROVED FOR PUBLIC RELEASE