A Steady State Model of X-Ray Emitting Coronae around Accreting Non-Magnetic White Dwarfs in Cataclysmic Variables

Publications of the Astronomical Society of Japan

Mahasena, Putra¹  Osaki, Yoji² 

[1] Department of Astronomy, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033 E-mail (PM): Department of Astronomy, Faculty of Mathematics and Natural Science, Institute of Technology Bandung, Jl. Ganesa 10, Bandung 40132, Indonesia;Department of Astronomy, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033 E-mail (PM):

关键词: Accretion;    "Stars: cataclysmic";    "stars: coronae";    "stars: dwarf novae";    "X-Rays: spectra";   

DOI  :  10.1093/pasj/51.1.45

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

TheX-rayemissionofnon-magneticcataclysmicvariablestarsisconsidered.Itiswellknownthatanearlysphericalhotcoronaisproducedaroundaccretingwhitedwarfsbecauseofstrongviscousheating,andofratherinefficientcoolingofmatterattheboundarylayeriftheaccretionrateisbelowsomecriticalvalue.AsteadystatemodelofX-rayemittingcoronae,intowhichmassissteadilysuppliedfromtheboundarylayer,isthenconstructedandtheX-rayspectraarecalculatedasfunctionsofthemass-supplyrateá¹€s.Eclipsesofsuchcoronaweresimulated.Ithasbeenfoundthatthethermalenergyofthecoronaistransporteddownwardbyconductiontothedenserareaneartothesurfaceofthewhitedwarf,whereitisemittedasX-rayradiation.Around5%ofthemattersuppliedbythediskcouldleavethesystemasstellarwind.MostoftheX-raysareradiatedfromregionsneartothewhitedwarfsurfacewithinthismodel.EclipsesimulationsofthismodelagreewithrecentobservationsofeclipsingsystemHTCas.

【 授权许可】

Unknown