Photometric Photometric observations of the observations of the cataclysmic variable cataclysmic variable star IP Peg star IP Peg

Rakutou High SchoolRakutou High SchoolKasumi Goto Ayano TeradaKasumi Goto Ayano Terada

The history of Our The history of Our observationsobservations

60cm telescope of HIDA observatory, 60cm telescope of HIDA observatory, September 23th of 2005 September 23th of 2005

40cm telescope of Kyoto University’s roof 40cm telescope of Kyoto University’s roof observatory, November 22nd of 2005observatory, November 22nd of 2005

　　　→　　　　→　 these clouded when eclipse.these clouded when eclipse.

December 23rd of 2006December 23rd of 2006　　　→　　　　→　 light curvelight curve　　　→　　　　→　 inclination angle of orbitinclination angle of orbit　　　→　　　　→　 angle of Hotspot with Companionangle of Hotspot with Companion

Couldn’t observe!!

•The system of CVs

　 Central star

　　　　→ Compact Star with Accretion Disc.

　 Companion (red giant)

　 Hot Spot

　 　 → Where gas flow on Accretion Disk

The orbital period → 　 typically several hours

ObservationObservation

Automatic observation exposure time 30 sec.

Dec 23rd of 2006, JT 18:53~21:25.

The 40cm telescope at Kyoto University roof observatory.

AnalysisAnalysis

IRAF software　　→　 at Kyoto university Makali`i　 (Subaru image processing software)　　→　 at school. We obtained stellar magnitudes.

The light curve simulationThe light curve simulation

Using IDL system At Department of Astronomy, Kyoto

University

The inclinations The angles of Hot Spot with companion

↓simulation

Simulation code is made by Mr. Sugiyasu.

companion

Accretion Disc

公転軌道面公転軸

Line of sight

Inclination

Revolution axis

降着円盤

視線方向

Surface of revolution orbit

伴星

Relationship of the companion star and the accretion disk, and Hot spot

Hot Spot

Companion Accretion Disc

Ordinate: magnitude 　Abscissa: time (hours)

The influence by the companion

center of 　 　eclipse

Factor point

Beginning of cloudy

The light curve

The inclination is 85°The angle of Hot Spot with the companion is 25°

•The simulation light curve

The inclination is 90°The inclination is 90°The angle of the Hot Spot with the companion is 25°The angle of the Hot Spot with the companion is 25°

ResultResult

The inclination is 85°

The angle of the Hot Spot

　　　　　　　　 with the companion is 25°

AcknowledgmentAcknowledgment

We thank staff of Department

of Astronomy, Kyoto University.