Studies of late-type binaries. I. The physical parameters of 44i Bootis ABC.

The physical parameters of the W UMa star 44 Iota Bootis BC belonging to the visual binary ADS 9494 were investigated using observations made between 1922 and 1987 with spectrographs attached to the Dominion Astrophysical Observatory's 1.2-m and 1.8-m telescopes. From a new spectroscopic/light curve study, the following physical parameters were found for the primary and the secondary components, respectively: m/solar mass ratios of about 0.98 and 0.55; R/solar radius ratios of about 0.87 and 0.66; and Te(K) of about 5300 and 5035. The mass ratio between the primary and the secondary component was estimated to be equal to about 1.79.