Isochrone fitting of Galactic globular clusters – IV. NGC 6362 and NGC 6723

Abstract We present new isochrone fits to the colour–magnitude diagrams of Galactic globular clusters NGC 6362 and 6723. utilize 22 26 photometric filters for 6723, respectively, from ultraviolet mid-infrared using data sets Hubble Space Telescope, Gaia, unWISE, other sources. use models isochrones Dartmouth Stellar Evolution Database (DSED) Bag Tracks Isochrones (BaSTI) α-enhanced [α/Fe] = +0.4 different helium abundances. The metallicities [Fe/H] −1.04 ± 0.07 −1.09 0.06 are derived red giant branch slopes in our fitting respectively. They agree with spectroscopic estimates literature. find a differential reddening up ΔE(B − V) 0.13 mag 6723 field due adjacent Corona Australis cloud complex. derive following respectively: distances 7.75 0.03 0.15 (statistic systematic error) 8.15 0.04 kpc; ages 12.0 0.1 0.8 12.4 Gyr; extinctions AV 0.19 0.24 mag; reddenings E(B 0.056 0.01 0.02 0.068 mag. DSED provides systematically lower higher than BaSTI. However, their relative estimates: is 0.44 kpc further, 0.5 Gyr older, 0.007 0.002 more reddened, 0.05 dex 6362. metallicity greater age respect explain horizontal morphology difference. This confirms as second parameter these clusters. provide lists cluster members Gaia Data Release 3.