1990 PHOTOMETRY OF A SMALL AMPLITUDE W UMA SYSTEM LS DELPHINI
ASTROPHYSICS AND SPACE SCIENCE, cilt.186, sa.1, ss.57-66, 1991 (SCI-Expanded, Scopus)
- 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.