engleski

High-S/N, high-resolution spectroscopy of an eclipsed Beta Cephei star - HD 92024

We present spectroscopic data from a recent orbital analysis of the eclipsing SB-1 type binary system HD 92024 which has a Beta Cephei component. Fully reduced spectra are given together with technical details from the analysis, published elsewhere. In addition, a graphical representation of a high-S/N time-averaged spectrum is provided with line identifications. The spectra show profound variability caused by stellar pulsations, which is essential for application in asteroseismology but disturbing for the dynamical analysis. Orbital elements derived from the spectra with a procedure devised to minimise influence from these line-profile variations are found to be more precise than when using classical methods. A line-variability indicator is described and then used to guide a selection of spectral line-regions rich in information on the stellar Beta Cephei oscillations. Two lines are examined as examples.

eclipsing binaries; variable stars; Beta Cep star

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