IR-source IRAS20508+2011: spectral variability of the central star

Details IR-source IRAS20508+2011: spectral variability of the central star IR-source IRAS20508+2011: spectral variability of the central star

2006-05-06

arxiv.org/abs/astro-ph/0605185v1

Astron.Rep. 50 (2006) 232-248

Astronomy and Astrophysics

Astrophysics

26 pages, 4 PS-figures, 4 tables, uses A&A style

Scientific paper

10.1134/S1063772906030073

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

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