Atmospheric dynamics in carbon-rich Miras: I. Model atmospheres and synthetic line profiles

Atmospheric dynamics in carbon-rich Miras : I. Model atmospheres and synthetic line profiles

Atmospheres of evolved AGB stars are heavily affected by pulsation, dust formation and mass loss, and they can become very extended. Time series of observed high-resolution spectra proved to be a useful tool to study atmospheric dynamics throughout the outer layers of these pulsating red giants. Originating at various depths, different molecular spectral lines observed in the near-infrared can be used to probe gas velocities there for different phases during the lightcycle. Dynamic model atmospheres are needed to represent the complicated structures of Mira variables properly. An important aspect which should be reproduced by the models is the variation of line profiles due to the influence of gas velocities. Based on a dynamic model, synthetic spectra (containing CO and CN lines) were calculated, using an LTE radiative transfer code that includes velocity effects. It is shown that profiles of lines that sample different depths qualitatively reproduce the behaviour expected from observations.

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
stars: late-type
stars: AGB and post-AGB
stars: atmospheres
stars: carbon
infrared: stars
line: profiles
Astronomy and astrophysics
Astronomi och astrofysik

Aringer, B. (författare)
Höfner, S.Uppsala universitet,Institutionen för astronomi och rymdfysik (författare)
Gautschy-Loidl, R. (författare)
Windsteig, W. (författare)
Uppsala universitetInstitutionen för astronomi och rymdfysik (creator_code:org_t)

Ingår i:Astronomy and Astrophysics: EDP Sciences437:1, s. 273-2840004-63611432-0746

Av författaren/redakt...: Nowotny, W.; Aringer, B.; Höfner, S.; Gautschy-Loidl, ...; Windsteig, W.

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