The atmospheric structure of Mira variables is considerably influenced by pulsation. Molecular absorption lines in the near-infrared (NIR), especially second overtone CO lines, show therefore a characteristic behaviour in time-series of high-resolution spectra. We computed synthetic CO line profiles based on a new dynamic model atmosphere and derived radial velocities (RVs) from the Doppler shifted lines. For the first time, we could quantitatively reproduce observations of the very typical, discontinuous RV curves.
Cite
@article{arxiv.astro-ph/0507476,
title = {Modelling NIR molecular lines for Miras},
author = {W. Nowotny and S. Hoefner and T. Lebzelter and B. Aringer and J. Hron},
journal= {arXiv preprint arXiv:astro-ph/0507476},
year = {2010}
}
Comments
2 pages, 1 figure, to be published in: Proc. "Stellar pulsation and evolution", Mem.Soc.Astron.Ital., Vol.76 (2005)