Optical/Near-IR spatially resolved study of the H II galaxy Tol 02
  The main goal of this study is to characterise the stellar populations in
very low metallicity galaxies. We have obtained broad U, B, R, I, J, H, K,
intermediate Str\"omgren y and narrow H{\alpha} and [OIII] deep images of the
Wolf-Rayet, Blue Compact Dwarf, H II galaxy Tol 02. We have analysed the low
surface brightness component, the stellar cluster complexes and the H II
regions. The stellar populations in the galaxy have been characterised by
comparing the observed broad band colours with those of single stellar
population models. The main results are consistent with Tol 02 being formed by
a 1.5 Gyr old disk component at the centre of which a group of 8 massive $>10^4
\, M_{\odot}$ stellar cluster clumps is located. Six of these clumps are 10 Myr
old and their near infrared colours suggest that their light is dominated by
Red Supergiant stars, the other two are young Wolf-Rayet cluster candidates of
ages 3 and 5 Myr respectively. 12 H II regions in the star-forming region of
the galaxy are also identified. These are immersed in a diffuse H{\alpha} and
[OIII] emission that spreads towards the North and South covering the old
stellar disk. Our spatial-temporal analysis shows that star formation is more
likely stochastic and simultaneous within short time scales. The mismatch
between observations and models cannot be attributed alone to a mistreat of the
RSG phase and still needs to be further investigated.
