Nonlinear Pulsation Driven by Strange Modes in Hydrodynamic Models

Aikawa Toshiki; Sreenivasan S. Ranga

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Nonlinear Pulsation Driven by Strange Modes in Hydrodynamic Models

机译：水力模型中奇异模式驱动的非线性脉动

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Thecharacteristicsofthenonlinearpulsationofhydrodynamicmodels,whichhaveonlystrangemodesaspulsationalunstablemodes,arecomparedwiththosebyconventionalmodes.Itisshownthatnonlinearpulsationwiththestrangemodeshasconsiderableamplitudesonlyatthehydrogenionizationzoneandintheatmosphere.Thisissharpincontrasttothatbyconventionalmodes,andisidenticalwiththecharacteristicsoftheunstablelinearstrangemodes.Wethusconcludethattheunstablestrangemodesmayberesponsibleforthenonlinearpulsation.Wealsodiscussthephysicaloriginoftheinstabilityofthestrangemodes.Sincethemodesarepulsationallyunstablewithoutanyluminosityperturbation,otherphysicalmechanismsmustbeinvolvedfortheinstabilityalongwiththeconventionalkappaandgammamechanisms,whicharefamiliarinCepheidvariables.WesuggestthatthedensityinversionintheHionizationregion,includingtheadjacentHeIionizationzone,maybetheorigin.Finally,wesuggestthatthedifferentpulsationdrivingzonesmaycausethefeatureofthespatialamplitudevariations.

机译：Thecharacteristicsofthenonlinearpulsationofhydrodynamicmodels，whichhaveonlystrangemodesaspulsationalunstablemodes，arecomparedwiththosebyconventionalmodes.Itisshownthatnonlinearpulsationwiththestrangemodeshasconsiderableamplitudesonlyatthehydrogenionizationzoneandintheatmosphere.Thisissharpincontrasttothatbyconventionalmodes，andisidenticalwiththecharacteristicsoftheunstablelinearstrangemodes.Wethusconcludethattheunstablestrangemodesmayberesponsibleforthenonlinearpulsation.Wealsodiscussthephysicaloriginoftheinstabilityofthestrangemodes.Sincethemodesarepulsationallyunstablewithoutanyluminosityperturbation，otherphysicalmechanismsmustbeinvolvedfortheinstabilityalongwiththeconventionalkappaandgammamechanisms，whicharefamiliarinCepheidvariables.WesuggestthatthedensityinversionintheHionizationregion，includingtheadjacentHeIionizationzone，maybetheorigin.Finally，wesuggestthatthedifferentpulsationdrivingzonesmaycausethefeatureofthespatialamplitudevariations。

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《PASJ: Publications of the Astronomical Society of Japan》 |1996年第1期|共页
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Aikawa Toshiki; Sreenivasan S. Ranga;
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Nonlinear Pulsation Driven by Strange Modes in Hydrodynamic Models

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