A binary star with a delta Scuti component: AB Cassiopeiae

Soydugan F., Demircan O., Akan M., Soydugan E.

ASTRONOMICAL JOURNAL, vol.126, no.4, pp.1933-1938, 2003 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 126 Issue: 4
  • Publication Date: 2003
  • Doi Number: 10.1086/378051
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1933-1938
  • Keywords: close, binaries : eclipsing, delta Scuti, stars : individual : (AB Cassiopeiae), PULSATION
  • Çanakkale Onsekiz Mart University Affiliated: Yes


New photometric observations of the Algol-type binary system AB Cassiopeiae were obtained in B and V filters during the 2001-2002 observing season at Ege University Observatory. As expected, the new light curves of the system, which were analyzed using the Wilson-Devinney code, exhibit short-period oscillations due to pulsation of the primary component. A photometric q-value search was performed, and the mass ratio of the system was found to be 0.19. The residuals from the observed-minus-computed light curves of the system reveal the pulsation light curves of the primary component. From the clear cycles of the pulsations in the light curves, we determined 21 new times of maximum light. The frequency content was investigated by using the Period98 program. Although the amplitude variation may suggest multiple periodicity in the pulsations, the power spectrum shows that only one frequency is significant; the remaining frequencies are probably not statistically significant. A multisite campaign is needed in order to study the reliability of the other pulsation modes.