V994 Herculis: the multiple system with a quadruple-lined spectrum and a double eclipsing feature

We report the discovery of a multiple system with a quadruple-lined spectrum and a double eclipsing feature. Our photometric and high-resolution spectroscopic data show that V994 Herculis (V994 Her; ADS 11373 AB) is composed of two pairs of double-lined eclipsing binaries, which we designate as A and B. System A consists of a B8V+A0V binary with an orbital period of 2.083 264 d and system B of a A2V+A4V binary with 1.420 033 d. Our light curves show that both of them have a detached binary configuration. We derive masses and radii of four components (Aa, Ab, Ba and Bb) from the synthetic analyses of light curves and radial velocity curves. The masses of systems A and B are M_Aa= 2.83 ± 0.20  M_⊙, M_Ab= 2.30 ± 0.16  M_⊙, M_Ba= 1.87 ± 0.12  M_⊙ and M_Bb= 1.86 ± 0.12  M_⊙, with radii R_Aa= 2.15 ± 0.05  R_⊙, R_Ab= 1.71 ± 0.04  R_⊙, R_Ba= 1.59 ± 0.08  R_⊙ and R_Bb= 1.50 ± 0.08  R_⊙, respectively. These masses and radii are well consistent with the empirical relation for double-lined eclipsing binaries.