An astrometric and spectroscopic study of the delta Scuti variable HD 21190 and its wide companion CPD-83A degrees A 64B


Niemczura E., Scholz R. -., Hubrig S., Jaervinen S. P., Schoeller M., Ilyin I., ...Daha Fazla

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, cilt.470, sa.4, ss.3806-3818, 2017 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 470 Sayı: 4
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1093/mnras/stx1377
  • Dergi Adı: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.3806-3818
  • Çanakkale Onsekiz Mart Üniversitesi Adresli: Evet

Özet

Although pulsations of delta Scuti type are not expected among Ap stars from a theoretical point of view, previous observations of the known delta Scuti star HD 21190 indicated a spectral classification F2 III SrEuSi:, making it the most evolved Ap star known. Our atmospheric chemical analysis based on recent High Accuracy Radial velocity Planet Searcher observations confirms the presence of chemical peculiarities in HD 21190. This star is also the only target known to host a magnetic field along with its delta Scuti pulsation properties. Using an astrometric analysis, we show that HD 21190 forms a physical binary system with the companion CPD -83A degrees A 64B. The presented astrometric and spectroscopic study of the binary components is important to understand the complex interplay between stellar pulsations, magnetic fields and chemical composition.