We present the preliminary results of an image-subtraction analysis of the Galactic globular cluster M79 ( NGC 1904 ) , as well as a new investigation of the variable star population in NGC 1851 .
Both M79 and NGC 1851 have been previously associated with the Canis Major overdensity , which has been suggested to have an extragalactic origin .
We found 6 new RR Lyrae in M79 , and also recovered 3 previously known RR Lyrae .
The average period of the 5 ab-type RR Lyrae is 0.68 d , corresponding to an Oosterhoff II classification – which is unusual , though not unprecedented , for systems of extragalactic origin .
We also report on the discovery of at least 4 previously unknown variables in NGC 1851 .