USAAAO — 2026 First Round

Star X and star Y form an eclipsing binary system, where star X is larger, and fully blocks star Y during an eclipse. During the primary eclipse, the apparent magnitude of the binary system increases by 0.200, and during the secondary eclipse, the apparent magnitude only increases by 0.100. If TX is the surface temperature of star X and TY is the surface temperature of star Y, which of the following is a possible value of TX/TY? Ignore limb darkening.