Ground-based photometric survey to search for the pulsational variability in Bp, Ap, and Am stars

TL;DR

This study analyzed photometric data of Bp, Ap, and Am stars to detect pulsational variability, finding no pulsations in some stars and potential new periods in others, contributing to understanding stellar oscillations.

Contribution

It presents new observational data on pulsational variability in chemically peculiar stars and proposes an international collaboration to enhance survey efforts.

Findings

No pulsational variability detected in the studied Bp and Ap stars.

Evidence of new periods found in two Am stars.

Supports ongoing efforts to identify pulsating chemically peculiar stars.

Abstract

We present the analysis of time-series of photoelectric data of a Bp star and four new Ap stars observed photoelectrically under the Nainital-Cape survey programme. The project was started about two decades ago, aiming to search for new rapidly oscillating Ap stars. The frequency analysis of the time-series of these stars obtained on multiple nights did not reveal any pulsational variability. In addition to this, we have performed the analysis of time-series differential CCD photometry of the two pulsating Am stars HD13038 and HD13079, where we find some evidence of new periods. To expand and strengthen the ongoing survey work, we propose to build-up a tri-national collaboration of astronomers from India, South Africa and Belgium.