2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/161197Let $(X,c_X)$ be a convex projective surface equipped with a real structure. The space of stable maps $\bar{\mathcal{M}}_{0,k}(X,d)$ carries different real structures induced by $c_X$ and any order two element $τ$ of permutation group $S_k$ acting on marked points. Each corresponding real part $\R_τ\bar{\mathcal{M}}_{0,k}(X,d)$ is a real normal projective variety. As the singular locus is of codimension bigger than two, these spaces thus carry a first Stiefel-Whitney class for which we determine a representative in the case $k=c_1(X)d-1$ where $c_1(X)$ is the first Chern class of $X$. Namely, we give a homological description of these classes in term of the real part of boundary divisors of the space of stable maps.33 pages, 10 figures, in FrenchAlgebraic GeometryAlgebraic Topology14F43; 14N35; 32V40text