1990 PHOTOMETRY OF A SMALL AMPLITUDE W UMA SYSTEM LS DELPHINI

DEMIRCAN O., SELAM S. O., DERMAN E.

ASTROPHYSICS AND SPACE SCIENCE, cilt.186, sa.1, ss.57-66, 1991 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 186 Sayı: 1
  • Basım Tarihi: 1991
  • Doi Numarası: 10.1007/bf00644619
  • Dergi Adı: ASTROPHYSICS AND SPACE SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.57-66
  • Ankara Üniversitesi Adresli: Evet

Özet

Differential UBV observations, carried out in 1990 observing season, of a small amplitude (0.15m in V and B) W UMa system LS Del = HD 199497 are presented. Wavelength-dependent light variations from cycle to cycle indicate that the system is in a very active phase, probably due to magnetic flare activity or mass transfer in the system. An analysis of the minima times indicate a probable secular increase of the photometric period which requires a mass transfer from less massive to more massive component. If this is true then the reverse-algol model by Liu et al. (1988) for this system would not be valid.