Speaker
Karlis Pukitis
(University of Latvia)
Description
Virtually nothing is known about the stellar wind in post-AGB phase despite it contributing to evolutionary rate of the star and formation of the subsequent planetary nebula. Near-infrared region of post-AGB star spectra remains unexplored in high-resolution. Of particular interest are CO molecular lines that probe outer atmospheric layers where outflows are expected to form. I will present near-infrared high-resolution spectra up to 1.7 microns of multiple post-AGB stars. Variability of CO second overtone lines and other spectral features will be analysed.