TY Men
Lapasset1980 - Lapasset1980y (Stromgren y)
The uvby light curves are from Naqvi & Gronbech (1975) and the solution (except for the hot spot) is Case 2 from Lapasset (1980). A hot spot was placed on the primary star as suggested by these authors and mentioned in Nagy (1985) and roughly modeled by Bradstreet (2004) in order to fit all the light curves. This resulted in a fairly large (25 degree radius) spot on the primary star with a temperature 6% higher than the surrounding photosphere. A spot with a 20% higher temperature as suggested by Nagy (1985) does not fit all of the different bandpasses, requiring (as in ER Vul) a much larger spot with a considerably cooler temperature. This model could certainly be refined, but the model presented here seemed adequate, as the mass ratio is also not known spectroscopically. It is also not clear why a cool spot on the secondary star might not also fit the data, as the quadrature at 0.75P shows greater scatter than that at the higher quadrature, i.e. at 0.25P.