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Daniel Nhlapo, Santosh Joshi, Bruno Letarte, Nand Kumar Chakradhari & Sanjeev Kumar Tiwari

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

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Mots-clés : Nainital-Cape, étoiles, Am, Ap, roAP, δ Scuti, photométrie, grande vitesse, variabilité, pulsations

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 HD 13038 and HD 13079, 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.

Keywords : Nainital-Cape, stars, Am, Ap, roAp, δ Scuti, photometry, high-speed, differential, variability, pulsations

To cite this article

Daniel Nhlapo, Santosh Joshi, Bruno Letarte, Nand Kumar Chakradhari & Sanjeev Kumar Tiwari, «Ground-based photometric survey to search for the pulsational variability in Bp, Ap, and Am stars», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 88 - Année 2019, Actes de colloques, 2nd Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop - October 2018 - Brussels, Belgium, 248 - 255 URL : https://popups.uliege.be/0037-9565/index.php?id=8929.

About: Daniel Nhlapo

Centre for Space Research, North-West University, South Africa, Daniel.Nhlapo@nwu.ac.za

About: Santosh Joshi

Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital 263002, India

About: Bruno Letarte

Centre for Space Research, North-West University, South Africa

About: Nand Kumar Chakradhari

School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla University, 492 010 Raipur, India

About: Sanjeev Kumar Tiwari

Siddhi Vinayak Engineering & Management College, Alwar 301001, Rajasthan, India