A systematic X-ray study of the dwarf novae observed with Suzaku

Publications of the Astronomical Society of Japan

Hayashi, Takayuki³  Wada, Qazuya¹  Ebisawa, Ken¹  Tsujimoto, Masahiro² 

[1] Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, 3-1-1 Yoshino-dai, Chuo-ku, Sagamihara, Kanagawa 252-5210, JapanDepartment of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, 3-1-1 Yoshino-dai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan;Goddard Space Flight Center, National Aeronautics and Space Administration, Greenbelt, MD 20771, USADepartment of Physics, Faculty of Science, Nagoya University, Furo-Cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan

关键词: "binaries: close";    "novae;    cataclysmic variables";    "stars: dwarf novae";    "X-rays: stars";   

DOI  :  10.1093/pasj/psw114

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

X-raybehaviorofthedwarfnovae(DNe)outsidethequiescentstatehasnotbeenfullyunderstood.Wethusassembled21datasetsofthe15DNeobservedbytheSuzakusatellitebytheendof2013,whichincludespectratakenduringnotonlythequiescence,butalsothetransitional,outburst,andsuper-outburststates.StartingwiththetraditionalcoolingflowmodeltoexplaintheX-rayemissionfromtheboundarylayer,wemadeseveralmodificationstoaccountfortheobservedspectra.Asaresult,wefoundthatthebest-fittingspectralmodeldependsstronglyonthestateoftheDNewithonlyafewexceptions.SpectrainthequiescentstateareexplainedbythecoolingflowmodelplusaFefluorescentlineemissionattenuatedbyaninterstellarextinction.Spectrainthetransitionalstaterequireanadditionalpartialcoveringextinction.Spectraintheoutburstandsuper-outburststaterequireadditionallow-temperaturethin-thermalplasmacomponent(s).Spectrainthesuper-outburststatefurtherrequireahighvalueofminimumtemperaturefortheboundarylayer.Wepresentaninterpretationontherequiredmodificationstothecoolingflowmodelforeachstate.

【 授权许可】

Unknown