Abstract Details

Name: Anusha R
Affiliation: CHRIST (Deemed to be University)
Conference ID: ASI2020_341
Title : A search for pulsations in TESS Be stars
Authors and Co-Authors : Anusha R, Sowgata Chowdhury, Blesson Mathew
Abstract Type : Poster
Abstract Category : Stars, ISM and Galaxy
Abstract : The process of disc evolution in classical Be stars, commonly known as the Be phenomenon, is one of the unsolved problems in stellar research. Non-radial pulsations in Be stars is suggested as one of the promising ways to form the disc. Astroseismology can provide better insights in this direction, by analysing the light curves of a sample of Be stars. The strategy should be to see whether Be stars show any prominent pulsation modes when compared to normal B-type stars. There are a few Be stars showing β Cepheid and/or Slowly Pulsating B-type (SPB) variability in their light curves. However, a comparison between the pulsation characteristics of normal B-type pulsators and those showing Be features, is lacking in literature. We used the high cadence time series data from Transiting Exoplanet Survey Satellite (TESS) for this study. A sample of well characterized 18 normal B-type stars and 50 B-type stars showing Be feature in their spectra, were carefully compiled from the literature. We performed the periodogram analysis on this sample of stars to see whether distinct modes of pulsation grouping can be seen between these B-type and Be stars samples. Our preliminary analysis suggest that g-mode pulsation is seen in both the stars and there is no clear distinction between the pulsation features of B and Be stars.