Short Orbital Period Cataclysmic Variables

Abstract

Cataclysmic Variables (CVs) are semi-detached binary systems consisting red/brown dwarfs filling its corresponding Roche lobe and loosing matter onto white dwarf (WD) companions. Classification of CVs is based on behavior of outbursts. In this report, we review properties of Short Orbital Period Cataclysmic Variables (77 min < P orb < 120 min). In mentioned orbital period range three subclasses of CVs were distinguished: SU UMa-, ER UMa-and WZ Sge-type objects. WZ Sge-type objects more probably includes also systems evolved past of the period minimum. The last are formed so-called bounce-backs or post-period minimum systems. Main characteristics of WDs, donor stars and accretion disks in the Short Orbital Period Cataclysmic Variables are discussed.