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A study of the stellar photosphere–hydrogen ionization front interaction in δ Scuti stars

Published online by Cambridge University Press:  06 February 2024

Mami Deka Open the ORCID record for Mami Deka [Opens in a new window] ,
Shashi M. Kanbur ,
Sukanta Deb  and
Susmita Das Open the ORCID record for Susmita Das [Opens in a new window]
Mami Deka*
Affiliation:
Department of Physics, Cotton University, Panbazar, Guwahati 781001, Assam, India
Shashi M. Kanbur
Affiliation:
Department of Physics, State University of New York Oswego, Oswego, NY 13126, USA
Sukanta Deb
Affiliation:
Department of Physics, Cotton University, Panbazar, Guwahati 781001, Assam, India Space and Astronomy Research Center, Cotton University, Panbazar, Guwahati 781001, Assam, India
Susmita Das
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Eötvös Loránd Research Network (ELKH), Konkoly Thege Miklós út 15-17, H-1121, Budapest, Hungary
*
email: mamideka8@gmail.com
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Abstract

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Pulsating variable δ Scuti stars are intermediate-mass stars with masses in the range of 1–3 δ and spectral types between A2 and F2. They can be found at the intersection of the Cepheid instability strip with the main sequence. They can be used as astrophysical laboratories to test theories of stellar evolution and pulsation. In this contribution, we investigate the observed period–colour and amplitude–colour (PCAC) relations at maximum/mean/minimum light of Galactic bulge and Large Magellanic Cloud δ Scuti stars for the first time and test the hydrogen ionization front (HIF)-photosphere interaction theory using the mesa-rsp code. The PCAC relations, as a function of pulsation phase, are crucial probes of the structure of the outer stellar envelope and provide insight into the physics of stellar pulsation and evolution. The observed behaviour of the δ Scuti PCAC relations is consistent with the theory of the interaction between the HIF and the stellar photosphere.

Keywords

starsvariablesdelta ScutiGalactic bulgeMagellanic Clouds
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S376: At the crossroads of astrophysics and cosmology: Period–luminosity relations in the 2020s , December 2022 , pp. 98 - 104
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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