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

Abstract

Asteroseismology has the potential to provide new insights into the physics of stellar interiors. We have obtained UVES high time resolution observations of the delta 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 14.2 min. This is one of the most evolved roAp stars. No rapid pulsations have been found in the spectra of the cool Ap star - delta Scuti star HD21190. However, we detect with unprecedented clarity for a delta Sct star moving peaks in the cores of spectral lines that indicate the presence of high degree non-radial pulsations in this star.

5 pages, 4 figures, 1 table, accepted for publication in MNRAS

Cited by in corpus (5)

• Rotation and pulsation in Ap stars: first light results from TESS sectors 1 and 2
• Discovery of 17 new sharp-lined Ap stars with magnetically resolved lines
• TESS Cycle 1 observations of roAp stars with 2-min cadence data
• On the spectroscopic nature of the cool evolved Am star HD151878
• An astrometric and spectroscopic study of the $\delta$ Scuti variable HD21190 and its wide companion CPD -83${}^{\circ }$ 64B