| Popis: |
Abstract We present the physical and orbital parameters of four short-period eclipsing W UMa systems: $$ZTFJ000030.44 +391106.9$$ Z T F J 000030.44 + 391106.9 (referred to as S1), $$ZTFJ000817.08+402532.1$$ Z T F J 000817.08 + 402532.1 (referred to as S2), $$ZTFJ002158.44+252934.04$$ Z T F J 002158.44 + 252934.04 (referred to as S3), and $$ZTFJ003357.62+415747.8$$ Z T F J 003357.62 + 415747.8 (referred to as S4). The absolute parameters and evolutionary status of these systems are determined, and new times of minima are calculated. Additionally, we present the 3D fill-out configuration for each system. The four Systems exhibit moderate contact W UMa binary with a fill-out factor of 49%, 38%, 28%, and 51%, respectively. Comparing the systems’ periods, we observed a proportional relationship, where shorter periods correspond to lower fill-out factors, and longer periods were associated with higher fill-out factors. Based on the derived surface temperatures and mass ratios of the components, all systems are classified as A-type W UMa binaries. The obtained parameters in addition to a list of previously published data are then utilized to derive an updated Mass-Luminosity relation (M-L) for both A and W-type eclipsing W UMa systems. A comparison with previously published relations reveals that the majority of the EW systems lie between 0.2 and 2 Msun on the M-L diagram. Moreover, we discuss the dynamical evolutionary aspects and evolutionary status of the four components, along with their positions on the Zero Age Main Sequence (ZAMS) and Terminal Age Main Sequence (TAMS). |
