Variable Star Images
What are Variable Stars

Variable Star AG AG Draconis Imaged 5/23/06
AG DraconisA close pair of a Orange-Red Giant and a White
Dwarf. AG Draconis is a halo star, which means it is from the
spheric halo around the Milky Way. Therefore its content of heavy
elements is very low, only 3% compared to the Sun.
The star erupts every 10-15 years, it is a Nova variable. However
these mini-novae increase its brightness only five times. Probably
this is due to its lack of heavy elements.

Constellation: Draco
Distance: 8000 light-years
Radial velocity: 140 km/sec
Space between AG Draconis A and B: 1.7 AU
Orbit period of AG Draconis A and B: 554 days
AG Draconis A
Spectral class: K0
Visual magnitude: 9.8
Luminosity: 1500 * Sun
Mass: 1.5 * Sun
AG Draconis B
Mass: 0.5 * Sun