  Stellar feedback in dwarf galaxies remains, to date, poorly explored, yet is
crucial to understanding galaxy evolution in the early Universe. In particular,
pre-supernova feedback has recently been found to play a significant role in
regulating and disrupting star formation in larger spiral galaxies, but it
remains uncertain if it also plays this role in dwarfs. We study the ionised
gas properties and stellar content of individual star-forming regions across
three nearby, low-metallicity, dwarf starburst galaxies (J0921, KKH046, and Leo
P) to investigate how massive stars influence their surroundings and how this
influence changes as a function of environment. To achieve this, we extracted
integrated spectra of 30 HII regions from archival VLT/MUSE integral field
spectroscopic observations of these three dwarf starburst galaxies. We fitted
the HII regions' main emission lines with Gaussian profiles to derive their
oxygen abundances, electron densities, and luminosities, and we used the
Stochastically Lighting Up Galaxies (SLUG) code to derive the stellar mass,
age, and bolometric luminosity of the stellar populations driving the HII
regions. We then quantified two pre-supernova stellar feedback mechanisms,
namely the direct radiation pressure and photoionisation feedback, and explored
how feedback strength varies with HII region properties. Our findings suggest
that stellar feedback has less of an impact on evolved regions, with both the
pressure of the ionised gas and the direct radiation pressure decreasing as a
function of HII region size. We also find that these stellar feedback
mechanisms are dependent on the metallicity of the HII regions. These findings
extend results from stellar feedback studies of more massive star-forming
galaxies to the low-mass, low-metallicity regime.
