New photometry of AW UMa and interpretation of time dependent variations of observed light curves

Details New photometry of AW UMa and interpretation of time dependent variations of observed light curves New photometry of AW UMa and interpretation of time dependent variations of observed light curves

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991baicz..42..331b&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 42, Nov. 1991, p. 331-344.

Other

7

Astronomical Photometry, Eclipsing Binary Stars, Light Curve, Electrophotometers, Photosphere, Stellar Models, Time Dependence

Scientific paper

Results of new B and V photoelectric observations of a W UMa type binary system, AW UMa, are obtained; the observations cover all phases of the light curve. All epochs of minima, including visual epochs spanning the time interval from 1963 to 1990, were collected. Both continuous and sudden orbital period changes were taken into consideration. The sum of the squares of the O-C values is lower for the sudden orbital period change approximation. There was a gap of 1119 d in the series of photoelectric observations of minima just around the time in which the period change occurred. The analysis makes it possible to diminish this critical interval to less than 307 d. A symmetrical reference light curve for the study of light curve changes is defined. The majority of light curves are classified as shallow and deep and the rest as intermediate- or extraordinary-state. Rules for the transition from one type of light curve to another and time intervals between transitions are established. A three-component model to explain the observed features of the light curve is proposed.

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