A study of the HI and optical properties of Low Surface Brightness
  galaxies: spirals, dwarfs and irregulars
  We present a study of the HI and optical properties of nearby ($z$ $\le$ 0.1)
Low Surface Brightness galaxies (LSBGs). We started with a literature sample of
$\sim$900 LSBGs and divided them into three morphological classes: spirals,
irregulars and dwarfs. Of these, we could use $\sim$490 LSBGs to study their HI
and stellar masses, colours and colour magnitude diagrams, and local
environment, compare them with normal, High Surface Brightness (HSB) galaxies
and determine the differences between the three morphological classes. We found
that LSB and HSB galaxies span a similar range in HI and stellar masses, and
have a similar $M_{\rm HI}$/$M_{\star}$--$M_{\star}$ relationship. Among the
LSBGs, as expected, the spirals have the highest average HI and stellar masses,
both of about 10$^{9.8}$ $M_\odot$. The LSGBs' ($g$--$r$) integrated colour is
nearly constant as function of HI mass for all classes. In the colour magnitude
diagram, the spirals are spread over the red and blue regions whereas the
irregulars and dwarfs are confined to the blue region. The spirals also exhibit
a steeper slope in the $M_{\rm HI}$/$M_{\star}$--$M_{\star}$ plane. Within
their local environment we confirmed that LSBGs are more isolated than HSB
galaxies, and LSB spirals more isolated than irregulars and dwarfs.
Kolmogorov-Smirnov statistical tests on the HI mass, stellar mass and number of
neighbours indicates that the spirals are a statistically different population
from the dwarfs and irregulars. This suggests that the spirals may have
different formation and HI evolution than the dwarfs and irregulars.
