Time resolved spectroscopy of the cool Ap star HD 213637

Elkin, V. G., Kurtz, D. W. orcid iconORCID: 0000-0002-1015-3268 and Mathys, G. (2014) Time resolved spectroscopy of the cool Ap star HD 213637. Monthly Notices of the Royal Astronomical Society, 446 (4). pp. 4126-4131. ISSN 0035-8711

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Official URL: http://dx.doi.org/10.1093/mnras/stu2406


We present an analysis of high time resolution spectra of the chemically peculiar Ap star HD 213637. The star shows rapid radial velocity variations with a period close to the photometric pulsation period. Radial velocity pulsation amplitudes vary significantly for different rare earth elements. The highest pulsation amplitudes belong to lines of Tb III (∼360 m s−1), Pr II (∼250 m s−1) and Pr III (∼230 m s−1).We did not detect any pulsations from spectral lines of Eu II and in Hα, in contrast to many other roAp stars. We also did not find radial velocity pulsations using spectral lines of other chemical elements, including Mg, Si, Ca, Sc, Cr, Fe, Ni, Y and Ba. There are phase shifts between the maxima of pulsation amplitudes of different rare earth elements and ions, which is evidence of an outwardly running magneto-acoustic wave propagating through the upper stellar atmosphere.

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