Implications of the kinematical structure of circumnuclear star-forming
  regions on their derived properties
  [Abbreviated] We review the results of high dispersion spectroscopy of 17
circumnuclear starforming regions (CNSFRs) in 3 nearby early spiral galaxies,
NGC2903, NGC3310 and NGC3351. We find that single Gaussian fitting to the
H$\beta$ and [OIII]5007A line profiles results in velocity dispersions around
32km/s and 52km/s, respectively, while the IR CaII triplet cross-correlation
technique provides stellar velocity dispersion values close to 50km/s. Even
though multiple kinematical components are present, the relation between gas
velocity dispersion and Balmer emission line luminosity (L-sigma relation)
reproduces the correlation for disk giant HII regions albeit with a larger
scatter. The scatter in the L-sigma relation is considerably reduced when
theoretical evolutionary corrections are applied suggesting that an age range
is present in the sample of CNSFRs. To analyse the observed complex profiles,
we performed multiple Gaussian component fits to the Hbeta and [OIII]?5007A
lines obtaining optimal fits with two Gaussians of different width. These best
fits indicate that the narrower component has average velocity dispersion close
to 23km/s while the broader component shows average values in the range
50-60km/s for both lines, close to the observed stellar velocity dispersions.
The fluxes of the broad and narrow Hbeta components are similar. This is not
the case for [OIII]5007A for which the broad components have higher fluxes than
the narrow ones, thus producing a clear segregation in their [OIII]/Hbeta
ratios. We suggest a possible scenario for understanding the behaviour of
CNSFRs in the L-sigma and sigma_gas-sigma_star diagrams involving an inner
gaseous disk responsible for the narrow component of the emission lines.
