The 1975 eclipse of AZ Cassiopeiae

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

We made photoelectric observations of the eclipsing system AZ Cas between 1975 September and 1976 December. This period corresponds to the ascending portion of the light curve, thus happily complements Tempesti's observations during the same eclipse. With these and other data we re-determined the new ephemeris Min = J.D.2442691 + 3403.6(+/-0.6) E, the duration of the eclipse D = 110 d, and the duration of totality d = 94 d. We found the fourth contact time to be different in different colours and the duration of the egress phase shorter than that of the ingress phase. An elementary photometric solution is presented. The sum of masses is found to be 32 M⊚, consistent with the spectroscopic values of Cowley et al. (1978). Their conclusion that the totality duration increases with time is, however, not confirmed.

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