2017/04/10 by G. Traven, Gregor Traven, U. Munari +5 · 1 citation
Physics and Astronomy · #Angular momentum #Astro and Planetary Science #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Binary number #Circular orbit #Effective temperature #Metallicity #Orbital eccentricity #Orbital elements #Orbital inclination #Orbital motion #Photometry (optics) #Physics #Radial velocity #Stars #Stellar, planetary, and galactic studies #astro-ph.SR
paper · pdf · doi:10.3847/1538-4357/aa6985
published in The Astrophysical Journal 839(1), 52 (IOP Publishing)
openalex publication_date 2017/04/10 · arxiv created 2017/05/16 · arxiv updated 2017/05/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Abstract The orbit and physical parameters of the previously unsolved double-lined eclipsing binary Tyc 5227-1023-1, discovered during the search for RR Lyr variable candidate members of the Aquarius stream, are derived using high-resolution échelle spectroscopy and photometry. A synthetic spectral analysis of both components has been performed, yielding metallicity [M/H] = −0.63 ± 0.11 for both stars and a temperature for the secondary that is in close agreement with the one from the orbital solution, while the temperature of the primary is determined from photometry ( ). The masses and radii ( ) reveal that both stars have already slightly evolved away from the main-sequence band, having an age of about 7 Gyr, and the results of the synthetic spectral analysis support the claim of corotation with the orbital motion. The radial velocity of the system is , while its distance, computed from orbital parameters and the derived reddening , is 496 ± 35 pc. Even though Tyc 5227-1023-1 was initially treated as a possible member of the Aquarius stream, the results presented here disagree with reported values for this ancient structure and suggest a likely membership of the thick disk.