摘要：Photometric and spectral observations of the W UMa binaries NSVS 4161544 and 1SWASP J034501.24 +493659.9 with periods of around 8hr are presented. The simultaneous light-curve and radial-velocity-curve solutions revealed that the two targets have over-contact configurations, and their components undergo partial eclipses. The derived parameters of NSVS 4161544 are: mass ratio q=3.377, orbital inclination i=65.0 0 , temperatures T 1 =6016 K and T 2 =5726 K, masses M 1 =0.43 M and M 2 =1.47 M , radii R 1 =0.74 R and R 2 =1.28 R ,luminosities L 1 =0.64 L and L 2 =1.51 L . The derived parameters of 1SWASP J034501.24 +493659.9 are: mass ratio q=2.378, orbital inclination i=60.3 0 , temperatures T 1 =6514 K and T 2 =6494 K, masses M 1 =0.275 M and M 2 =0.654 M , radii R 1 =0.693 R and R 2 =1.012 R , luminosities L 1 =0.775 L and L 2 =1.632 L . Hence, the masses of the 1SWASP J034501.24+493659.9 components are quite small for the rest global parameters, and their sum of 0.93 M is slightly below the lower mass limit of 1.0–1.2 M e for the contact binaries. The calculated distance of NSVS 4161544 almost coincides with that determined by GAIA. The calculated distance of 1SWASP J034501.24+493659.9 is considerably smaller than the GAIA value that is most likely due to overestimation of the interstellar extinction to this star from the Galactic disk.
关键词：binaries: eclipsing;binaries: spectroscopic;stars: distances;stars: fundamental parameters;stars: individual
