Optical Photometry of the Dwarf Nova QZ Serpentis in Outburst

摘要

We present white-light and two-colour photometry of the dwarf nova QZ Serpentis during the 2020 March outburst and performed differential photometry in the filters Clear (white-light), Johnson-Cousins V and Johnson-Cousins R with respect to the comparison star USNOBl.0 1112-0250654. All observations were obtained in Hilden (Germany). A radial velocity study by Thorstensen et al. (2017) shows this system has an orbital period of 119.75 minutes. After removing linear trends in our data we estimate a superhump period of P_(sh) = 0.0855537±0.0000421 days and a mass ratio of q = 0.133 ±0.012.