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The first multi-colour light curve models and period studies for the totallyeclipsing W UMa stars TYC 3700-1384-1, V1511 Her and V1179 Her are presented.All three stars are A-subtype W UMa stars of spectral type F. The light curvesolutions show that TYC 3700-1384-1 has a moderately low mass ratio of q =0.182 +/- 0.001 and a degree of overcontact of f = 49%. For V1179 Her a massratio q = 0.153 +/- 0.001 and a degree of overcontact of f = 48% is derived.The solution for V1511 Her is inconclusive, however the mass ratio is expectedto be between 0.13 < q < 0.15. The evolutionary status is compared withzero-age main sequence stars taking into account energy transfer from theprimary to the secondary component. The primary component of TYC 3700-1384-1fits well in the main-sequence, while V1179 Her is more evolved. The periodstudy reveals for all three stars a continuously increasing period at a rate ofdP/dt = 6.1x10-7 d/yr, dP/dt = 5.0x10-7 d/yr and dP/dt = 9.6x10-7 d/yr for TYC3700-1384-1, V1511 Her and V1179 Her respectively. The estimated mass transferrates derived from these period changes are 1.6x10-7 solMass/yr for TYC3700-1384-1 and 1.9x10-7 solMass/yr for V1179 Her.

Photometric analysis of three totally eclipsing W UMa stars with increasing periods: TYC 3700-1384-1, V1511 Her and V1179 Her