New pulsating variables discovered from the Naini Tal-Cape survey

Abstract

The Naini Tal-Cape survey has been initiated to search for pulsations in chemically peculiar A and F type stars. Many of the magnetic A peculiar type stars exhibit rapid oscillations with periods ranging from 4-16 minutes. These stars are termed as rapidly oscillating Ap stars (roAp) stars. The oscillations are attributed to low order, high overtone p modes. In addition to the Ap stars, this region of the HR diagram also encompasses the non-magnetic 'Am' or metallic lined stars. Some of these Am stars exhibit low overtone 6 Scuti type pulsations. The scientific motivation for a study of these oscillations is discussed along with the results on the variables discovered from the survey.