IR-source IRAS20508+2011: spectral variability of the central star
Abstract
Over the five years of high-resolution spectroscopy of the cool star identified with the IR source IRAS20508+2011, the photospheric radial velocity variability Vr=15-30km/s is detected. In the same time, the Halpha profile varied from an intense bell-shaped emission line with a small absorption to 2-peaked emission with a central absorption feature below the continuum level. The NaD doublet lines shown a complex profile with broad (FWHM \approx 120km/s) emission and photospheric absorption, as well as an interstellar component. We used model atmospheres to determine the physical parameters and chemical composition of the star's atmosphere: Te=4800K, log g=1.5, [Fe/H]=-0.36, [O/Fe] =+1.79 (with the ratio [C/O]=-0.9). The totality of the parameters suggests that the optical component of IRAS20508+2011 is an O-rich AGB star with luminosity Mv
Cite
@article{arxiv.astro-ph/0605185,
title = {IR-source IRAS20508+2011: spectral variability of the central star},
author = {V. G. Klochkova and V. E. Panchuk and N. S. Tavolganskaya and G. Zhao and .},
journal= {arXiv preprint arXiv:astro-ph/0605185},
year = {2009}
}
Comments
26 pages, 4 PS-figures, 4 tables, uses A&A style