2007MNRAS.382..239C

We report the discovery of the first high-amplitude δ 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±0.02M_☉ and a late-K spectral-type secondary of mass 0.33±0.02M_☉, with an inclination of, and a period of 5.3504751±0.0000006 d. A Fourier analysis of the residuals from this solution is performed using period04 to investigate the δ Scuti pulsations. We detect a single pulsation frequency of f₁= 13.621±0.015/cd, and it appears that 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.