Synthetic Line Profiles for Pulsating Red Giants

Details Synthetic Line Profiles for Pulsating Red Giants Synthetic Line Profiles for Pulsating Red Giants

2005-03-30

arxiv.org/abs/astro-ph/0503654v2

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, to be published in: Proc. of ESO Workshop "High-resolution IR spectroscopy in Astronomy", ed. H.U. Kaeufl,

Scientific paper

10.1007/10995082_44

Pulsation influences atmospheric structures of variable AGB stars (Miras) considerably. Spectral lines of the CO dv=3 vibration-rotation bands (at 1.6mue) therefore have a very characteristic appearance in time series of high-resolution spectra. Coupled to the light cycle they can be observed blue- or red-shifted, for some phases even line doubling is found. This is being explained by radial pulsations and shock fronts emerging in the atmospheres. Based on dynamic model atmospheres synthetic CO line profiles were calculated consistently, reproducing this scenario qualitatively.

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