1990 photometry of a small amplitude W UMA system LS Delphini

Details 1990 photometry of a small amplitude W UMA system LS Delphini 1990 photometry of a small amplitude W UMA system LS Delphini

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.186...57d&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 186, no. 1, Dec. 1991, p. 57-66.

Astronomy and Astrophysics

Astrophysics

3

Binary Stars, Stellar Spectrophotometry, Ubv Spectra, Light Curve, Stellar Flares, Stellar Mass Accretion

Scientific paper

Differential UBV observations, carried out in 1990 observing season, of a small amplitude (0.15 m 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.

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