Star Formation in Nearby Isolated Galaxies
  We use the FUV fluxes measured with the GALEX to study the star formation
properties of galaxies collected in the "Local Orphan Galaxies" catalog (LOG).
Among 517 LOG galaxies having radial velocities V(LG) < 3500 km/s and Galactic
latitudes |b|> 15 degr, 428 objects have been detected in FUV. We briefly
discuss some scaling relations between the specific star formation rate (SSFR)
and stellar mass, HI-mass, morphology, and surface brightness of galaxies
situated in extremely low density regions of the Local Supercluster. Our sample
is populated with predominantly late-type, gas-rich objects with the median
morphological type of Sdm. Only 5% of LOG galaxies are classified as early
types: E, S0, S0/a, however, they systematically differ from normal E and S0
galaxies by lower luminosity and presence of gas and dust. We find that almost
all galaxies in our sample have their SSFR below 0.4 [Gyr^{-1}]. This limit is
also true even for a sample of 260 active star-burst Markarian galaxies
situated in the same volume. The existence of such a quasi-Eddington limit for
galaxies seems to be a key factor which characterizes the transformation of gas
into stars at the current epoch.
