Period–Luminosity Relationship for δ Scuti Stars Revisited

Abstract The Gaia DR3 parallax approach was used to estimate the absolute parameters of 2375 δ Scuti stars from the ASAS catalog. The selected stars have a variety of observational characteristics, with a higher than 80% probability of being δ Scuti stars. We have displayed all the stars in the Hert...

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Published in:Research in astronomy and astrophysics 2024-02, Vol.24 (2), p.25011
Main Authors: Poro, Atila, Jafarzadeh, S. Javad, Harzandjadidi, Roghaye, Madani, Mohammad, Bozorgzadeh, Elnaz, Jahangiri, Esfandiar, Sarostad, Ahmad, Alizadehsabegh, Ailar, Hadizadeh, Maryam, EsmaeiliVakilabadi, Mohammad
Format: Article
Language:English
Subjects:
Hertzsprung-Russell diagram
Luminosity
Machine learning
Mathematical analysis
methods: data analysis
Parallax
Parameters
Stars
stars: fundamental parameters
stars: variables: delta Scuti
Statistical analysis
Temperature effects
Variable stars
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Summary:Abstract The Gaia DR3 parallax approach was used to estimate the absolute parameters of 2375 δ Scuti stars from the ASAS catalog. The selected stars have a variety of observational characteristics, with a higher than 80% probability of being δ Scuti stars. We have displayed all the stars in the Hertzsprung–Russell diagram along with the δ Scuti instability strip, the Zero Age Main Sequence and the Terminal Age Main Sequence. Then, we determined which fundamental and overtone modes each star belongs to using pulsation constant ( Q ) calculations. In addition, we evaluated the parameters in the Q calculation equation using three machine learning methods, which showed that surface gravity and temperature have the greatest effect on its calculation. The Period–Luminosity ( P - L ) relationship of the δ Scuti stars was also revisited. Eventually, using least squares linear regression, we made four linear fits for fundamental and overtone modes and updated their relationships.
ISSN:1674-4527
2397-6209
DOI:10.1088/1674-4527/ad1b0f