The discovery of rapid oscillations in the magnetic Ap stars HD69013 and HD96237

Abstract

We report the detection of short period variations in the stars HD69013 and HD96237. These stars possess large overabundances of rare earth elements and global magnetic fields, thus belong to the class of chemically peculiar Ap stars of the main sequence. Pulsations were found from analysis of high time resolution spectra obtained with the ESO Very Large Telescope using a cross correlation method for wide spectral bands, from lines belonging to rare earth elements and from the H alpha core. Pulsation amplitudes reach more than 200 m/s for some lines in HD69013 with a period of 11.4 min and about 100m/s in HD96237 with periods near 13.6 min. The pulsations have also been detected in photometric observations obtained at the South African Astronomical Observatory.

submitted to MNRAS

References in corpus (2)

• Kepler observations of a roAp star: delta Scuti and gamma Doradus pulsations in Ap stars
• Discovery of 17 new sharp-lined Ap stars with magnetically resolved lines

Cited by in corpus (9)

• The first evidence for multiple pulsation axes: a new roAp star in the Kepler field, KIC 10195926
• The Nainital-Cape Survey-IV
• TESS Cycle 1 observations of roAp stars with 2-min cadence data
• KIC 7582608: A new Kepler roAp star with frequency variability
• Discovery of new roAp pulsators in the UVES survey of cool magnetic Ap stars
• Suppressed phase variations in a high amplitude rapidly oscillating Ap star pulsating in a distorted quadrupole mode
• Whole Earth Telescope discovery of a strongly distorted quadrupole pulsation in the largest amplitude rapidly oscillating Ap star
• Asteroseismology with SuperWASP
• The Hvar survey for roAp stars: II. Final results (Research Note)