We report the discovery of the first high-amplitude \delta Scuti star in an eclipsing binary , which we have designated UNSW-V-500 .
The system is an Algol-type semi-detached eclipsing binary of maximum brightness V = 12.52 mag .
A best-fitting solution to the binary light curve and two radial velocity curves is derived using the Wilson-Devinney code .
We identify a late A spectral type primary component of mass 1.49 \pm 0.02 M _ { \odot } and a late K spectral type secondary of mass 0.33 \pm 0.02 M _ { \odot } , with an inclination of 86.5 \pm 1.0 ^ { \circ } , and a period of 5.3504751 \pm 0.0000006 d. A Fourier analysis of the residuals from this solution is performed using PERIOD04 to investigate the \delta Scuti pulsations .
We detect a single pulsation frequency of f _ { 1 } = 13.621 \pm 0.015 cd ^ { -1 } , and it appears this is the first overtone radial mode frequency .
This system provides the first opportunity to measure the dynamical mass for a star of this variable type ; previously , masses have been derived from stellar evolution and pulsation models .