Evolution of Accretion Disks with Mass Evaporation during the Quiescence of WZ Sge-Type Dwarf Novae and X-Ray Novae

Publications of the Astronomical Society of Japan

Meyer-Hofmeister, Emmi³  Mineshige, Shin¹  Liu, Bifang²  Meyer, Friedrich³ 

[1] Department of Astronomy, Kyoto University, Sakyo-ku, Kyoto 606-8502; Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85740 Garching bei München, Germany Max-Planck-Institut fur Astrophysik, Karl-Schwarzschild-Str. 1, D-85740 Garching, Germany;Max-Planck-Institut fur Astrophysik, Karl-Schwarzschild-Str. 1, D-85740 Garching, GermanyYunnan Observatory, Academia Sinica, P.O. Box 110, Kunming 65011, China;Max-Planck-Institut fur Astrophysik, Karl-Schwarzschild-Str. 1, D-85740 Garching, Germany

关键词: "Accretion disks";    "Black holes";    Evaporation;    "Stars: dwarf novae";    "X-rays: stars";   

DOI  :  10.1093/pasj/50.5.L5

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

WeproposeanewscenariofordiskevolutionduringthequiescenceofWZSge-typedwarfnovaeandX-raynovae.Aholecreatedbyevaporationoftheinnerdiskmaterialsteadilyexpandstowardslargerradii,eventuallyremovingthermallyunstableportionsofthedisk.Thediskis,however,notinasteadystate,sinceacertainamountofangularmomentumiscontinuouslybroughtinbyanincomingstream,whereasangular-momentumlossesduetotheevaporationandtothetidalactionbyacompanionstararelikelytobesmallinthequiescence.Accordingly,thetotalangularmomentumofthediskmonotonicallyincreases,whereasanincreaseinthediskmassissomewhatslowerbecauseofthemassevaporation.Thisresultsinanexpansionofthediskandanaccumulationofmassintheoutermostpartofthedisk.Thequiescencewillbeterminatedifathermalinstabilityisignitedbeforethediskexpandstothecriticalradiusforthe3:1resonancebetweenKeplerandorbitalangularfrequencies.Ifnot,superhumpsareexpectedduringquiescence.

【 授权许可】

Unknown