Determination of variability properties of candidate pulsating Am stars
Year: 2024
Type: article
Abstract: The main goal of the study was to investigate the variability properties of candidate pulsating Am stars. Using TESS data and Eleanor software, light curves of 30 target stars were obtained. The light curves were fitted with a Fourier series to obtain Fourier transforms of the 30 target stars. By visual inspection of the light curves and Fourier transforms: 28 stars are variable and 2 are non-variable. Based on the Fourier transforms and the Q constant, of the 28 variable stars 4 stars have δ Scuti-type and 16 are γ Doradus-type pulsations. 7 stars of the 28 variables are rotational, and 1 star is in a binary system. There are 2 stars out of the 4 δ Scuti with rotational and pulsational signals. These results have increased the number of well-known pulsating Am stars. The presence of pulsational signals in such stars contradicts the atomic diffusion models. This implies that pulsation needs to be accounted for in the atomic diffusion models in the attempt to explain the origin of chemical peculiarities in Am stars. The rotational variables are moderate to slow rotators and since their values of v sin i are known, their rotational profiles are complete.
Authors: Ssebaggala, Chrizestom, Otto, Trust, Muheki, Priscilla
Institution: Mbarara University of Science and Technology
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6892932560
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