System Parameters for the Eclipsing B-star Binary BD+11°3569
Gies, Douglas R.; Matson, Rachel A.; Williams, Stephen J.; Ryle, Wesley T.; O'Bryan, Sierra R.; Perrino, Terri A.; Farwick, Cristi A.
United States
Abstract
We present the results from a combined spectroscopic and photometric in-depth study of the binary system BD+11o3569 (B4 V + B5 V). Fits to Johnson V, Cousins R C and I C photometry, and radial velocities yield an orbital period of 1.49712598 ± 0.00000020 days and an inclination of 82.°93 ± 0.°17. The combined light curves and radial velocity solution give masses and radii of M 1 = 5.259 ± 0.064 M ⊙ with M 2 = 4.325 ± 0.040 M ⊙ and R 1 = 3.509 ± 0.018 R ⊙ with R 2 = 2.570 ± 0.023 R ⊙. We find that the system does not match a single age isochrone when derived astrophysical quantities for the components are compared with theoretical stellar models, but are bounded by 32 and 40 Myr isochrones. We estimate a distance to the system of 1130 ± 150 pc, which agrees reasonably with the published Gaia distance.