 Cataclysmic or explosive variable stars are those that undergo a dramatic change in their properties . This group includes novae and supernovae . A binary star system that includes a nearby white dwarf can produce certain types of these spectacular stellar explosions , including the nova and a Type 1a supernova . The explosion is created when the white dwarf accretes hydrogen from the companion star , building up mass until the hydrogen undergoes fusion . Some novae are also recurrent , having periodic outbursts of moderate amplitude . 
 Cataclysmic or explosive variable stars <a href='drop_aux' title='1'><mark>are</mark></a>those <a href='null_relcl' title='2'><mark>that</mark></a>undergo a dramatic change in their properties . This group <a href='uninflect' title='3'><mark>includes</mark></a> novae and supernovae . A binary star system <a href='null_relcl' title='4'><mark>that</mark></a><a href='uninflect' title='5'><mark>includes</mark></a> a nearby white dwarf can produce certain types of these spectacular stellar explosions , including the nova and a Type 1a supernova . The explosion is created when the white dwarf accretes hydrogen from the companion star , building up mass until the hydrogen undergoes fusion . Some novae <a href='drop_aux' title='6'><mark>are</mark></a>also recurrent , having periodic outbursts of moderate amplitude . 
Cataclysmic or explosive variable stars those undergo a petty change in their properties . dis group include novae and supernovae . A binary star system include a nearby white dwarf can produce certain types of dese spectacular stellar explosions , including the nova and a Type 1a supernova . The explosion is created when the white dwarf accretes hydrogen from the companion star , building up mass until the hydrogen undergoes fusion . Some novae also recurrent , having periodic outbursts of moderate amplitude .