Review of C ataclysmic Variables : Unification model for various types of variations
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Review of Cataclysmic Review of Cataclysmic Variables : Variables :
Unification model Unification model for various types of for various types of
variationsvariationsMakoto Uemura Makoto Uemura
(Kyoto University : VSNET (Kyoto University : VSNET team)team)
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ContentsContents
Recent works of the VSNET teamRecent works of the VSNET team Various types of variations in CVsVarious types of variations in CVs Unification model for the CV Unification model for the CV
activityactivity To “see” accretion disksTo “see” accretion disks SummarySummary
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Recent works 1 : GRB Recent works 1 : GRB 010222010222
Left : CCD images of GRB 010222 taken at Kyoto University (Rc=19.3). The right image is from DSS.
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Black hole X-ray transient V4641 SBlack hole X-ray transient V4641 Sgrgr
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WZ Sge outburst in 2001WZ Sge outburst in 2001
(VSNET)
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Sub-groups of CVsSub-groups of CVs
NovaNova Dwarf novaDwarf nova
SS Cyg SS Cyg Z Cam Z Cam SU UMa SU UMa WZ Sge WZ Sge
Nova-like Nova-like variablesvariables RW TriRW Tri UX UMaUX UMa SW SexSW Sex VY SclVY Scl
Magnetic CVsMagnetic CVs Polar Polar Intermediate Intermediate
polarpolar
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Dwarf nova U Gem Dwarf nova U Gem
6mag
1yr
“Outburst”
(VSNET)
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Dwarf nova Z Cam Dwarf nova Z Cam
3mag
3mon
“Standstill”
(VSNET)
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Dwarf nova SU UMa Dwarf nova SU UMa
3mag
1mon
Normal outburst
“Superoutburst”
(VSNET)
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Superhumps in SU UMa Superhumps in SU UMa starsstars
(VSNET)
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Nova-like variable UX Nova-like variable UX UMaUMa
2mag
1yr
(VSNET)
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Characteristics of sub-Characteristics of sub-classesclasses SS Cyg : (normal) outburstSS Cyg : (normal) outburst Z Cam : standstill Z Cam : standstill SU UMa : superoutburst + SU UMa : superoutburst +
superhumpssuperhumps Nova-like variables : quasi-steadyNova-like variables : quasi-steady
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Artist’s view of CVsArtist’s view of CVs
(Credit: K. Smale)
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PPorb orb – Mv relation – Mv relation
Dwarf nova
Novalike
Z Cam
SS CygSU UMa
(Warner 1987)
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Unification model of CVs : Unification model of CVs : 1. Thermal instability of 1. Thermal instability of accretion diskaccretion disk
Low temperature “Quiescence”
High temperature “Outburst”
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Unification model of CVs :Unification model of CVs :2. Tidal instability model2. Tidal instability model
Psuperhump ~ 1.03 Porbital
(SPH simulation by Murray)
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PPorb orb – Mv relation – Mv relation
Dwarf nova
Novalike
Z Cam
SS CygSU UMa
Thermal instability
Tidal instabilit
y
(Osaki 1996)
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Observation of “disks”Observation of “disks”
Observation
Eclipse mapping
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Examples of eclipse mapping: Examples of eclipse mapping: IY UMaIY UMa
Superoutburst on 2000 January
Early phase with fully-grown superhumps
Late phase with late superhumps
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Examples of eclipse mapping: Examples of eclipse mapping: DV UMaDV UMa
Superoutburst Superoutburst on 1999 on 1999
DecemberDecember
Rapid Rapid evolution of evolution of an accretion an accretion disk during disk during the very early the very early phase of the phase of the superoutburssuperoutburstt
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Summary Summary Various types of variations in CVs can basiVarious types of variations in CVs can basi
cally be interpreted with two instabilities wically be interpreted with two instabilities within accretion disks.thin accretion disks.
The eclipse mapping method is a strong toThe eclipse mapping method is a strong tool to study accretion disks. For investigatiol to study accretion disks. For investigation of continuous evolution of disks, multi-lon of continuous evolution of disks, multi-longitude observations are essential.ongitude observations are essential.
VSNET serves a number of information on VSNET serves a number of information on variable stars through e-mails, ftp, and wevariable stars through e-mails, ftp, and web. Let’s enjoy the world of VSNET ! b. Let’s enjoy the world of VSNET ! (http://v(http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/index.html)snet.kusastro.kyoto-u.ac.jp/vsnet/index.html)