Refined investigation of the low-amplitude contact binary V1003 Her

We present an extensive analysis of the low amplitude, contact binary V1003 Her, based on the new VRcIc, CCD photometric light curves in combination with published radial velocity (RV) curves. We investigate the stable configurations for the system with two independent methods and modeling tools: PHOEBE, ROCHE, via heuristic scanning and genetic algorithms, although the very low inclination of the system can place limitations. All methods indicate that V1003 Her is most likely in overcontact state with unequal components with temperature difference of 550 K, a mass ratio of q = 0.373 and a contact degree of 36 +/- 10 %. As it is viewed at the very low inclination of i similar to 38 degrees +/- 1 degrees, if its configuration is confirmed, it will be among the most massive W-subtype of W UMa systems. This conclusion is also supported by other published models. However, in order to conclude reliable physical properties of the system, the high-precise based-ground photometry (or satellite photometry) and spectroscopic follow-up of V1003 Her is required.