1986/02/01 by Daniel M. Popper, Claud H. Sandberg Lacy, M. Frueh +1 · 3 citations
Engineering · Physics and Astronomy · #Astronomical Observations and Instrumentation #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Globular cluster #Main sequence #Physics #RR Lyrae variable #Stars #Stellar, planetary, and galactic studies
paper · doi:10.1086/114018
openalex publication_date 1986/02/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
Spectrographic and photometric observations of three detached main sequence eclipsing binary systems with one or both components of type G, HS Aur, FL Lyr, and EW Ori, are analyzed. Ephemerides, V and R magnitudes, V-R indices, epochs, periods, e cos omega, photometric solutions, and spectrograms are presented for the systems. The radial velocities are analyzed and the orbital elements are obtained. A preliminary comparison of the systems is made with predictions from evolutionary models. HS Aur now represents a well-analyzed main sequence detached binary with both components having properties lying between those of the sun and the M1 dwarf YY Gem. In the case of FL Lyr, the two components differ significantly in their properties, making it of particular interest for its comparison with interior models and for its potential contribution to the flux and temperature scales.