Gas and Dust Mass Loss of O-rich AGB-stars

Autor(en)

Franz Kerschbaum, Hans Olofsson, Thomas Posch, Delgado D Gonzalez, Per Bergman

Abstrakt

We present results from systematic surveys and subsequent modelling of circumstellar CO and SiO radio line emission of oxygen-rich semiregular and irregular variables of types SRa, SRb, and Lb, respectively. Results from high spatial resolution observations of a subsample of these objects with a more complex velocity structure in their CO profiles are presented; they show a clear evidence of deviations from spherically symmetric mass loss. The observations can be interpreted in terms of disks and/or axially symmetric outflows. Moreover, insights into the thermal emission from dust particles forming around these late type variables are presented. An identification of metal oxides and amorphous silicates in low and intermediate mass loss rate objects is also proposed.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Stockholm Observatory, Chalmers University of Technology

Band

16

Seiten

171-189

Anzahl der Seiten

19

DOI

https://doi.org/10.1002/9783527617647

Publikationsdatum

2003

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/82f99263-ef90-4c86-8f79-812cbed32ff2