Simultaneous uvby photometric observations of the high amplitude delta
Set star BS Aqr have been collected and new times of light maxima wer
e obtained. Additionally, some H-beta observations are also presented.
The light curves have been analysed and the physical parameters of th
is star are determined. The results indicate that BS Aqr is an evolved
monoperiodic delta Set star, with solar abundances, pulsating radiall
y in the fundamental mode.