Pre-main sequence stars in LH 91

Aims. We study the accretion properties of pre-main sequence (PMS) low-mass stars in the LH 91 association within the Large Magellanic Clouds. Methods. Using optical multiband photometry obtained with the Hubble Space Telescope, we identify 75 candidates showing H alpha excess emission above the 3 sigma level with equivalent width EWH alpha >= 10 angstrom. We estimate the physical parameters (effective temperature, luminosity, age, mass, accretion luminosity, and mass accretion rate) of the PMS stellar candidates. Results. The age distribution suggests a period of active star formation ranging from a few million years up to similar to 60 Myr with a gap between similar to 5 Myr and 10 Myr. The masses of the PMS candidates span from 0.2 M-circle dot for the cooler objects to 1.0 M-circle dot with a median of similar to 0.80 M-circle dot. The median value of the accretion luminosity of our 75 PMS stars is about 0.12 L-circle dot, the median value of the mass accretion rate is about 4:8 x 10(-9) M-circle dot yr(-1) with higher values for the younger population (similar to 1:2 x 10(-8) M-circle dot yr(-1)), and lower values for the older candidates (similar to 4:7 x 10(-9) M-circle dot yr(-1)). We compare our results with findings for LH 95, the closest region to LH 91 for which accretion properties of PMS candidates were previously derived. An interesting qualitative outcome is that LH 91 seems to be in a more evolved stage. Moreover, we find that the PMS candidates are distributed homogeneously, without any evidence of clumps around more massive stars.