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A Cmos 555 does not double the supply voltage like the LM3909 does so it needs a 3V battery instead of a 1.5V battery.LM3909 is not intereting...
for a 1.5V flasher use a COMOS 555 like ZSCT1555(works down to 0.9V).
also try LMC555, TLC555 ICM7555
Bill bowden has almost the same circuit except it has a voltage doubler so it works from a single 1.5V battery cell:Better you use a transistorised astable multivibrator with NPN & PNP transistor and a POT in series with feedback Capacitor. This is the cheapest circuit and the simplest one.