Time resolved spectroscopy of the cool Ap star HD 213637

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...

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Published in:Monthly notices of the Royal Astronomical Society 2015-02, Vol.446 (4), p.4126-4126
Main Authors: Elkin, V G, Kurtz, D W, Mathys, G
Format: Article
Language:English
Subjects:
Amplitudes
Chemical elements
Chromium
Ions
Photometry
Propagation
Pulsation
Radial velocity
Rare earth elements
Spectral lines
Spectrum analysis
Stars
Stars & galaxies
Trace elements
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description 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 ( similar to 360 m s super(-1)), Pr II ( similar to 250 m s super(-1)) and Pr III ( similar to 230 m s super(-1)). We did not detect any pulsations from spectral lines of Eu II and in H alpha , 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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subjects Amplitudes
Chemical elements
Chromium
Ions
Photometry
Propagation
Pulsation
Radial velocity
Rare earth elements
Spectral lines
Spectrum analysis
Stars
Stars & galaxies
Trace elements
title Time resolved spectroscopy of the cool Ap star HD 213637
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