Non-conservative mass transfers in Algols

ERDEM A., ÖZTÜRK O.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol.441, no.2, pp.1166-1176, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 441 Issue: 2
  • Publication Date: 2014
  • Doi Number: 10.1093/mnras/stu630
  • Journal Name: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1166-1176
  • Keywords: binaries: close, binaries: eclipsing, ANGULAR-MOMENTUM LOSS, W-SERPENTIS STARS, S-CANCRI, LIGHT-CURVE, MAGNETIC ACTIVITY, PERIOD CHANGES, BINARIES, SYSTEM, EVOLUTION, CASSIOPEIAE
  • Çanakkale Onsekiz Mart University Affiliated: Yes

Abstract

We applied a revised model for non-conservative mass transfer in semi-detached binaries to 18 Algol-type binaries showing orbital period increase or decrease in their parabolic O-C diagrams. The combined effect of mass transfer and magnetic braking due to stellar wind was considered when interpreting the orbital period changes of these 18 Algols. Mass transfer was found to be the dominant mechanism for the increase in orbital period of 10 Algols (AM Aur, RX Cas, DK Peg, RV Per, WX Sgr, RZ Sct, BS Sct, W Ser, BD Vir, XZ Vul) while magnetic braking appears to be the responsible mechanism for the decrease in that of 8 Algols (FK Aql, S Cnc, RU Cnc, TU Cnc, SX Cas, TW Cas, V548 Cyg, RY Gem). The peculiar behaviour of orbital period changes in three W Ser-type binary systems (W Ser, itself a prototype, RX Cas and SX Cas) is discussed. The empirical linear relation between orbital period (P) and its rate of change (dP/dt) was also revised.