Optical spectral variability of IRAS 20508+2011 (Klochkova+, 2006)

Details Optical spectral variability of IRAS 20508+2011 (Klochkova+, 2006) Optical spectral variability of IRAS 20508+2011 (Klochkova+, 2006)

Jan 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ycat..80830265k&link_type=abstract

VizieR On-line Data Catalog: J/AZh/83/265. Originally published in: 2006AZh....83..265K; 2006ARep..50...232K

Physics

Stars: Atmospheres, Spectroscopy, Abundances

Scientific paper

Based on high-resolution spectra we revealed variability of the optical spectrum of the cool star identified with the IR source IRAS 20508+2011. Over the five years of our observations, the radial velocity derived from photospheric absorption lines varied in the interval Vr=15-30km/s. In the same time, the H(alpha) 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. At all but one epoch, the positions of the metallic photospheric lines were systematically shifted relative to the H(alpha) emission: Delta Vr=Vr(met)-Vr(Halpha,emis)~-23km/s. The NaD doublet lines shown a complex profile with broad (half-width about 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: Teff=4800K, logg=1.5, Vt=4.0km/s and metallicity [Fe/H]=-0.36. We detected overabundances of oxygen [O/Fe]=+1.79 (with the ratio [C/O]~-0.9), and alpha-process elements, as well as a deficit of heavy metals. The totality of the parameters suggests that the optical component of IRAS 20508+2011 is an "O-rich" AGB star with luminosity Mv~-3mag that is close to its evolution transition to the post-AGB stage.
(1 data file).

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