How Important Are Metal-Poor AGB Stars As Cosmic Dust Producers?

Autor(en)

Lars Mattsson, Bernhard Aringer, Anja C. Andersen

Abstrakt

The efficiency of dust formation in oxygen-rich AGB stars should
(in theory) be metallicity dependent since they are not producing their own raw material for dust production. Metal-poor carbon stars may not be very efficient dust producers either, because of greater radiative heating of the grains forming in their atmospheres. We have just confirmed that inefficient dust and wind formation in simulations of metal-poor carbon stars is a real physical effect, albeit within the
limitations of our simulations. Taken at face value, this implies that the amount of dust supplied by low-metallicity AGB stars to the build-up
of the cosmic dust component is clearly limited. Consequently, one may also ask how large a contribution AGB stars can make in general, when compared to recent observations of cosmic dust, which are suggesting major contributions from other sources.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

INAF - Osservatorio Astronomico di Padova, Uppsala University, University of Copenhagen

Seiten

385 - 391

Publikationsdatum

08-2015

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/how-important-are-metalpoor-agb-stars-as-cosmic-dust-producers(52dc419a-3925-4463-a5fe-b784e21ad245).html