Discovery of a New SU UMa-Type Dwarf Nova, V 1028 Cygni

[摘要] V-bandhigh-speedCCDphotometryofV1028Cygrevealedthathumpstructuresexistedintheearlystageofits1995Julyoutburst.Weobtained0.06154(±0.00002)dasthebestestimatedperiodofsuperhumps.WeconfirmedthatthisdwarfnovabelongstotheSUUMastars.Are-brighteningoccurredafterthesuperoutburst,andmaybeassociatedwithanormaloutburst.Ananalysisofthetimingsofsuperhumpmaximashowedclearevidenceforanincreaseofthesuperhumpperiod(Pdot=á¹–/P)with7.54×10−6.Onlyafewstars(ALCom,TLeo,SWUMa,etc.)arereportedtohavesuchanincreaseofthesuperhumpperiod.Attheendofthesuperoutburst,wedetectedthattheamplitudeofthesuperhumpsincreasedconsiderably.BothofthesepropertiesarenottypicalfeaturesofordinarySUUMastars.TheconnectionbetweentheWZSge-typeandtheSUUMa-typedwarfnovaeisbrieflydiscussed.

[学科分类] 天文学(综合)

[关键词] "stars: dwarf novae";"stars: individual (V 1028 Cyg)";"novae;cataclysmic variables"