Discovery of pulsational line profile variations in the Delta Scuti star HD21190 and in the Ap Sr star HD218994

GONZÁLEZ, J. F.; HUBRIG, S.; KURTZ, D. W.; ELKIN, V.; SAVANOV, I.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

Blackwell Publishing

Año: 2008 vol. 384 p. 1140 - 1144

0035-8711

Asteroseismology has the potential to provide new insights into the physics of stellar interiors. We have obtained Ultraviolet and Visual Echelle Spectrograph high time-resolution observations of the δ Scuti star HD21190 and of the Ap Sr star HD218994 to search for pulsational line profile variations. We report the discovery of a new roAp star, HD218994, with a pulsation period of 14.2min. This is one of the most evolved roAp stars. No rapid pulsations have been found in the spectra of the cool Ap star - δ Scuti star HD21190. However, we detect with unprecedented clarity for a δScuti star moving peaks in the cores of spectral lines that indicate the presence of high-degree non-radial pulsations in this star.