1990 photometry of a small amplitude W UMa system LS Delphini |
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Authors: | O Demircan S Selam E Derman |
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Institution: | (1) Observatory and Astronomy and Space Sciences Department, Faculty of Sciences, Ankara University, Ankara, Turkey |
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Abstract: | DifferentialUBV observations, carried out in 1990 observing season, of a small amplitude (0
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m
15 inV andB) 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 Liuet al. (1988) for this system would not be valid. |
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