Method for determining the physical parameters of hot supergiants based on spectral energy distribution analysis


Gyuchtash A.T. Nurmakhametova S.T. Vaidman N.L. Khokhlov S.A. Agishev A.T. Bakhytkyzy A.
23 June 2025al-Farabi Kazakh State National University

Physical Sciences and Technology
2025#12Issue 1-245 - 56 pp.

This study determines the physical parameters of B-and A-type hot supergiants through the construction and analysis of their spectral energy distributions (SEDs). These luminous stars are in the late stages of stellar evolution and are important for understanding stellar structure and the chemical evolution of galaxies. Although previous spectroscopic studies provided extensive information, our application of the comprehensive SED analysis represents a novel approach to further refine and validate these parameters. We refined the effective temperature Teff, surface gravity (log g), and interstellar extinction AV for a sample of 16 supergiants using multiwavelength photometry spanning from the ultraviolet to the infrared. A dedicated software package written in Fortran was used to convert observed magnitudes into physical fluxes and compare them with synthetic photometry derived from Castelli & Kurucz model atmospheres. The optimal parameter set for each star was obtained by minimizing the deviations between the observed and model SEDs, iterating over AV values. The resulting parameters show good agreement with those published in the literature, confirming the reliability of our approach.

effective temperature , interstellar extinction , spectral energy distribution , supergiants , surface gravity

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Fesenkov Astrophysical Institute, Observatory, Almaty, Kazakhstan
Department of Physics and Astronomy, University of North Carolina – Greensboro, Greensboro, NC, United States

Fesenkov Astrophysical Institute
Department of Physics and Astronomy

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