Abstract.
Blue compact dwarf galaxies (BCDGs) are dwarfs undergoing current
burst of star formation (SF). In our work, we determine the ages of
the underlying old stellar population to be ∼4 Gyr that is
dominating the mass of the galaxy, underlying the current burst of
SF. An intermediate population of ∼500$ Myr which dominates the
stellar light from the galaxy is also detected. The burst of SF at
the present epoch spans ∼10 Myr as estimated from various age
estimators like Hα, diagnostic diagrams and colour-colour
diagrams. BCDGs undergo a burst of SF for a longer duration (of
about a few 100 Myr to a Gyr) followed by a short/long quiescence.
The amount of column density of localized neutral hydrogen required
for the current burst to occur seems to be 1021
cm,-2.
This could be the threshold required for SF. Radio continuum
emission reveals that the emission is coincident with the star
forming regions. The star formation rates (SFR) estimated from
Hα match well with the SFR estimated using non-thermal radio
emission for individual star forming regions, but are ∼6-7
times less as compared to the SFR calculated from far-IR (FIR)
emission.
Key words:star forming regions; spectrum of star forming regions;
Hα photometry;
general - galaxies: dwarfs, blue compact dwarf galaxies, galaxies:
stellar content