Light curves and period changes of OO Aquilae

Demircan O., GÜROL B.

ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, cilt.115, sa.2, ss.333-338, 1996 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 115 Sayı: 2
  • Basım Tarihi: 1996
  • Dergi Adı: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.333-338
  • Anahtar Kelimeler: stars, OO Aql, binaries, close, eclipsing, BINARY STARS, SYSTEMS, CYCLES
  • Ankara Üniversitesi Adresli: Evet

Özet

All available light curves and times of minima of OO Aql from the literature have been used to study the light curve and period variation of the system. Both the light curve and photometric period were found variable, but no simple correlation in between could be revealed. The present (O-C) data covering similar to 45000 cycles of orbital period is equally well represented by two sloping straight lines or a large amplitude (A=0.0455 d) sinusoidal wave (with P similar or equal to 89 y). The sinusoidal variation, if real, predicts an unseen third star with a minimum mass of 0.8 M.; in the system. The systematic deviations of the data from the best representations have an amplitude of about 1 10(-6) d which may be caused by fluctuations in the mass transfer (or loss) rate, or magnetic activity variations of the component stars.