Absolute Dimensions of the Early F-type Eclipsing Binary V506 Ophiuchi

• Published in: The Astrophysical journal Vol. 876; no. 1; pp. 41 - 47
• Main Authors: Torres, Guillermo, Sandberg Lacy, Claud H., Fekel, Francis C., Muterspaugh, Matthew W.
• Format: Journal Article
• Language: English
• Published: Philadelphia The American Astronomical Society 01-05-2019; IOP Publishing
• Subjects: Astronomical models; Astrophysics; binaries: eclipsing; Binary stars; Eclipsing binary stars; Effective temperatures; Hydrogen; Parallax; Physical properties; stars: evolution; stars: fundamental parameters; stars: individual (V506 oph); Stellar age; Stellar evolution; Stellar models; Stellar rotation; techniques: photometric; techniques: spectroscopic
• ISSN: 0004-637X; 1538-4357
• DOI: 10.3847/1538-4357/ab1487

We report extensive differential V-band photometry and high-resolution spectroscopic observations of the early F-type, 1.06-day detached eclipsing binary V506 Oph. The observations, along with times of minimum light from the literature, are used to derive a very precise ephemeris and the physical properties for the components, with the absolute masses and radii being determined to 0.7% or better. The masses are 1.4153 0.0100 M☉ and 1.4023 0.0094 M☉ for the primary and secondary, the radii are 1.725 0.010 R☉ and 1.692 0.012 R☉, and the effective temperatures are 6840 150 K and 6780 110 K, respectively. The orbit is circular and the stars are rotating synchronously. The accuracy of the radii and temperatures is supported by the resulting distance estimate of 564 30 pc, which is in excellent agreement with the value implied by the trigonometric parallax listed in the Gaia/Data Release 2 catalog. Current stellar evolution models from the Modules for Experiments in Stellar Astrophysics (MESA) Isochrones and Stellar Tracks series for a composition of [Fe/H] = −0.04 match the properties of both stars in V506 Oph very well at an age of 1.83 Gyr and indicate they are halfway through their core hydrogen-burning phase.