Visual Orbits of Spectroscopic Binaries with the CHARA Array. II. The eclipsing binary HD 185912

TL;DR

This paper combines interferometry, spectroscopy, and photometry to precisely determine the orbital parameters, component masses, radii, and age of the eclipsing binary HD 185912, providing valuable data for stellar evolution studies.

Contribution

The study presents the first combined visual and spectroscopic orbit of HD 185912, improving mass and radius measurements and estimating its age, which was not previously available.

Findings

Component masses: M1 = 1.361 Msun, M2 = 1.331 Msun

Component radii: R1 = 1.348 Rsun, R2 = 1.322 Rsun

Estimated age: 500 Myr

Abstract

We present the visual orbit of the double-lined eclipsing binary, HD 185912, from long baseline interferometry with the CHARA Array. We also obtain echelle spectra from the Apache Point observatory to update the spectroscopic orbital solution and analyze new photometry from Burggraaff et al. to model the eclipses. By combining the spectroscopic and visual orbital solutions, we find component masses of M1 = 1.361 +/- 0.004 Msun and M2 = 1.331 +/- 0.004 Msun, and a distance of d = 40.75 +/- 0.30 pc from orbital parallax. From the light curve solution, we find component radii of R1 = 1.348 +/- 0.016 Rsun and R2 = 1.322 +/- 0.016 Rsun. By comparing these observed parameters to stellar evolution models, we find that HD 185912 is a young system near the zero age main sequence with an estimated age of 500 Myr.