In this paper we combine WFC3/UVIS F275W , F336W , and F438W data from the “ UV Legacy Survey of Galactic Globular Clusters : Shedding Light on Their Populations and Formation ” ( GO 13297 ) HST Treasury program with F606W , F625W , F658N , and F814W ACS archive data for a multi-wavelength study of the globular cluster NGC 6352 .
In the color-magnitude and two-color diagrams obtained with appropriate combination of the photometry in the different bands we separate two distinct stellar populations and trace them from the main sequence to the subgiant , red giant , horizontal and asymptotic giant branches .

We infer that the two populations differ in He by \Delta Y = 0.029 \pm 0.006 .
With a new method , we also estimate the age difference between the two sequences .
Assuming no difference in [ Fe/H ] and [ \alpha /Fe ] , and the uncertainties on \Delta Y , we found a difference in age between the two populations of 10 \pm 120 Myr .
If we assume [ Fe/H ] and [ \alpha /Fe ] differences of 0.02 dex ( well within the uncertainties of spectroscopic measurements ) , the total uncertainty in the relative age rises to \sim 300 Myr .