New photometric study of a southern contact binary system: HI Puppis

• BVRI light curves of HI Pup are obtained at South African Astronomical Observatory.
• Light and radial velocity curves are analysed and physical parameters are derived.
• The system is found to be an A-type W UMa system according to our results.

We present results of new photometric observations of the contact binary system HI Pup as well as the radial velocity curve of the system. Time series multicolour photometry was obtained at the South African Astronomical Observatory (SAAO) using the 1-m Cassegrain Telescope. We applied a simultaneous solution to the BVRI   light and radial velocity curves in order to determine the physical parameters of the system. From an analysis of the new multicolour data, the physical parameters were found to be M1=1.22M⊙,M2=0.23M⊙,R1=1.44R⊙,R2=0.67R⊙,L1=3.3L⊙,L2=0.7L⊙. Our solution confirms that HI Pup has a typical A-type W UMa binary system characteristics.