Analysis of TESS field eclipsing binary star V948 Her: a pulsating or non-pulsating star?

Kahraman Aliçavuş F., Ekinci Ö.

Research In Astronomy And Astrophysics, cilt.1, sa.110, ss.1-15, 2021 (SCI-Expanded)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 1 Sayı: 110
  • Basım Tarihi: 2021
  • Dergi Adı: Research In Astronomy And Astrophysics
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, INSPEC
  • Sayfa Sayıları: ss.1-15
  • Çanakkale Onsekiz Mart Üniversitesi Adresli: Evet

Özet

Pulsating stars occupy a significant place in the H-R diagram and it was thought that all stars inside the classical instability strip should pulsate. However, recent studies showed
that there are many non-pulsating stars placed inside the classical instability strip. The existence of these non-pulsating stars is still a mystery. To deeply understand the properties
of these non-pulsating and pulsating stars, one needs precise fundamental stellar parameters (e.g mass). For this purpose, the eclipsing binaries are unique systems. Hence, in this
study, we present the TESS data analysis of one candidate pulsating eclipsing binary system V948 Her. TESS data were used for the binary modelling with the literature radial velocity
measurements and the precise fundamental parameters of the system were obtained. The system’s age was derived as 10.24 Gyr. The positions of the binary components in the H-R
diagram were examined and the primary component was found inside the Delta Scuti instability strip. However, in the frequency analysis of TESS data, we found no significant pulsation frequencies.
Only the harmonics of the orbital periods were obtained in the analysis. Therefore, the system was classified as a non-pulsator. V948 Her is an important object to understand
the nature of non-pulsating stars inside the Delta Scuti instability strip.