W Virginis high-resolution spectra (Kovtyukh+, 2011)

Details W Virginis high-resolution spectra (Kovtyukh+, 2011) W Virginis high-resolution spectra (Kovtyukh+, 2011)

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ycat..35269116k&link_type=abstract

VizieR On-line Data Catalog: J/A+A/526/A116. Originally published in: 2011A&A...526A.116K

Physics

Stars: Variable, Spectroscopy

Scientific paper

Our spectroscopic study of W Vir involved 18 high-resolution spectra obtained with the help of 3.5-m telescope of Apache Point Observatory. These spectra cover W Vir's pulsational cycle with good phase resolution that enabled us to precisely fix the intervals of appearance, existence and disappearance of many anomalous spectral features, as well as to construct their radial velocity curves. We detected and investigated the behaviour of emission and line doubling in many metallic lines (NaI, FeI, FeII, BaII etc), as well as in hydrogen and helium lines. Analysis of the temporal characteristics of those emission features allowed us to make, in particular, the following conclusion. W Vir consists of two parts: the inner part, which is, in fact, a pulsating star itself with periodic shocks penetrating into the upper atmosphere, an outer one - a circumstellar envelope. The interaction of the main shock wave with the infalling envelope layers can explain the observed peculiarities of the spectral line variability.
(8 data files).

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