Dust in Stellar Winds: A Micro- and Macroscopic View

Autor(en)

Marko Mecina, Martin A. T. Groenewegen, Franz Kerschbaum, Bernhard Aringer, Walter Nowotny-Schipper, Roland Ottensamer, Andreas Mayer, Armin Luntzer

Abstrakt

In the course of the MESS Guaranteed Time Key Program, geometrically thin and overall spherically symmetric detached shells were observed with Herschel/PACS amongst a morphologically diverse sample of (post-)AGB stars. We use 1D dust radiative transfer modelling to determine shell properties such as the dust mass, the corresponding mass-loss rate (MLR) and dust temperature, in order to assess the possible scenarios of shell formation. As an example we present the case of the carbon star U Hya. For the modelling the chosen dust properties are crucial, and we show the key aspects and their effect on the results obtained. We further attempt to establish a physical model of the observed stellar dust envelope by means of a stationary wind code to test whether an abrupt change in the MLR can cause the observed detached shell.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

INAF - Osservatorio Astronomico di Padova, Royal Observatory of Belgium

Seiten

395 - 396

Publikationsdatum

08-2015

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/dust-in-stellar-winds-a-micro-and-macroscopic-view(57e763b8-c933-44dc-a126-7f500b4d979b).html