V371 Per was found to be a double-mode Cepheid with a fundamental mode period of 1.738 days , the shortest among Galactic beat Cepheids , and an unusually high period ratio of 0.731 , while the other Galactic beat Cepheids have period ratios between 0.697 and 0.713 .
The latter suggests that the star has a metallicity [ Fe/H ] between -1 and -0.7 .
The derived distance from the Galactic Plane places it in the Thick Disk or the Halo , while all other Galactic beat Cepheids belong to the Thin Disk .
There are indications from historical data that both the fundamental and first overtone periods have lengthened .