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Victoria-Regina isochrones for $-0.4 \le$ [alpha/Fe] $\le +0.4$ and a widerange in [Fe/H], along with complementary zero-age horizontal branch (ZAHB)loci, have been applied to the color-magnitude diagram (CMD) of Carina. Thecolor transformations that we have used have been "calibrated" so thatisochrones provide excellent fits to the $[(B-V)_0,\,M_V]$-diagrams of M3 andM92, when well supported estimates of the globular cluster (GC) reddenings andmetallicities are assumed. The adopted distance moduli, for both the GCs andCarina, are based on our ZAHB models, which are able to reproduce the old HBcomponent (as well as the luminosity of the HB clump) of the dwarf spheroidalgalaxy quite well --- even if it spans a range in [Fe/H] of ~ 1.5 dex, providedthat [alpha/Fe] varies with [Fe/H] in approximately the way that has beenderived spectroscopically. Ages derived here agree reasonably well with thosefound previously for the old and intermediate-age turnoff stars, as well as forthe period of negligible star formation (SF) activity (~ 6-10 Gyr ago). CMDsimulations have been carried out for the faintest turnoff and subgiant stars.They indicate a clear preference for SF that lasted several Gyr instead of ashort burst, with some indication that ages decrease with increasing [Fe/H]. Ingeneral, stellar models that assume spectroscopic metallicities providesatisfactory fits to the observations, including the thin giant branch ofCarina, though higher oxygen abundances than those implied by the adoptedvalues of [alpha/Fe] would have favorable consequences.

astrophysical journal/the astrophysical journal

Color-Magnitude Diagram Constraints on the Metallicities, Ages, and Star  Formation History of the Stellar Populations in the Carina Dwarf Spheroidal  Galaxy