The first high-amplitude δ Scuti star in an eclipsing binary system

November 2007 • 2007MNRAS.382..239C

Authors • Christiansen, J. L. • Derekas, A. • Ashley, M. C. B. • Webb, J. K. • Hidas, M. G. • Hamacher, D. W. • Kiss, L. L.

Abstract • 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_solar and a late-K spectral-type secondary of mass 0.33 +/- 0.02M_solar, 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^-1, 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.

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2007MNRAS.382..239C
• PDF https://academic.oup.com/mnras/pdf-lookup/doi/10.1111/j.1365-2966.2007.12338.x
• PREPRINT http://arxiv.org/abs/0707.4540
• ELECTR http://dx.doi.org/10.1111/j.1365-2966.2007.12338.x
• GIF http://articles.adsabs.harvard.edu/full/2007MNRAS.382..239C
• ARTICLE http://articles.adsabs.harvard.edu/full/2007MNRAS.382..239C?defaultprint=YES