Presentation on theme: "Light Curves of the Dwarf Nova U Gem: A Diagnostic of Accretion Disk Evolution Larry Molnar Calvin College Grand Rapids, Michigan."— Presentation transcript:
Light Curves of the Dwarf Nova U Gem: A Diagnostic of Accretion Disk Evolution Larry Molnar Calvin College Grand Rapids, Michigan
Outline Calvin-Rehoboth Twin Telescopes Project Dwarf Novae U Gem Preliminary Light Curves
Calvin-Rehoboth Twin Telescope Project NSF-CCLI funding Two 16” OGS telescopes –One in Grand Rapids, MI Hands-on experience for students Development platform for remote site –One in Rehoboth, NM (35.5N,108.6W) Unattended robotic operation High throughput
Dwarf Novae White dwarf + red dwarf Red dwarf fills Roche Lobe Angular momentum loss leads to mass transfer via an accretion stream, and formation of an accretion disk Disk conditions do not permit steady-state
U Gem Brightness: 10-14 magnitude Mass ratio: 0.25 Orbital period: 4.24 hours Outburst time scale: 3-4 months Inclination: hot spot is eclipsed by red dwarf
Conclusions U Gem data demonstrate capabilities of new system Comparison of eclipses before and after outburst are consistent with accretion disk radius increasing gradually through the quiescent phase
Your consent to our cookies if you continue to use this website.