Large-Amplitude Superhumps in ER Ursae Majoris during the Earliest Stage of a Superoutburst

Kato Taichi; Nogami Daisaku; Masuda Seiji

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Large-Amplitude Superhumps in ER Ursae Majoris during the Earliest Stage of a Superoutburst

机译：爆发大爆发最早阶段的马俄斯大is虫大幅度超峰

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Time-resolvedCCDphotometryofapeculiarSUUMa-typedwarfnova,ERUMa,duringtheearlieststageofsuperoutburstsrevealedtheexistenceoflarge-amplitude(??0.35mag)superhumps.Thesesuperhumpsappearat,orevenduring,therisetothesuperoutburstmaximum,andshowarapiddecayofamplitudeswithatimescaleofafewdays.Afteraperiodshowingalow-amplitudevariation,superhumpswithmoreusualsingly-peakedprofilesappearinthelaterstageofthesuperoutburst.Suchanearlyappearanceofsuperhumpsseemstocontradictthecurrentgrowthmodelofsuperhumpsortidalinstability,whosegrowthratehasbeenshowntobeproportionaltothesquareofthebinarymassratio.Severalpossibilitiestoexplainthisanomalyarealsobrieflydiscussed,aswellasacomparisonwithotherearlystagesuperhumpsinWZSgestars.

机译：时间resolvedCCDphotometryofapeculiarSUUMa-typedwarfnova，ERUMa，duringtheearlieststageofsuperoutburstsrevealedtheexistenceoflarge振幅（?? 0.35mag）superhumps.Thesesuperhumpsappearat，orevenduring，therisetothesuperoutburstmaximum，andshowarapiddecayofamplitudeswithatimescaleofafewdays.Afteraperiodshowingalow-amplitudevariation，superhumpswithmoreusualsingly-peakedprofilesappearinthelaterstageofthesuperoutburst.Suchanearlyappearanceofsuperhumpsseemstocontradictthecurrentgrowthmodelofsuperhumpsortidalinstability，whosegrowthratehasbeenshowntobeproportionaltothesquareofthebinarymassratio.Severalpossibilitiestoexplainthisanomalyarealsobrieflydiscussed，aswellasacomparisonwithotherearlystagesuperhumpsinWZSgestars。

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《PASJ: Publications of the Astronomical Society of Japan》 |1996年第1期|共页
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Kato Taichi; Nogami Daisaku; Masuda Seiji;
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Large-Amplitude Superhumps in ER Ursae Majoris during the Earliest Stage of a Superoutburst

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