We compare the SFR of single star-forming galaxies with the SFR of
star-forming galaxies in pairs. Volume-limited samples are compared selected
from the 2dFGRS, applying a maximum magnitude difference criterion. We show
that SF galaxies in SF + SF pairs typically increase their SFR as they get
fainter, whereas this does not happen for SF galaxies in mixed (SF + passive)
pairs. And we provide evidence that differences between single SF and SF in
pairs get more significant when SF galaxies in mixed pairs are excluded from
the pair sample. Our analysis confirms that enhanced SFR and the presence of a
companion galaxy (on 0.5 h^-1 Mpc scale) are correlated quantities, provided
the galaxy is neither too luminous nor too faint, and the triggering galaxy is
itself a SF galaxy.Comment: 6 pages, 3 figures, contributed paper, to be published in ''The
Evolution of Starbursts'' (Bad Honnef 2004), ed. S. Huettemeister & E.
Manthley (Melville:AIP
