Fig. 1. Left (or above):
Number distribution of current star formation rates (SFR) determined
from Halpha luminosities for a sample of irregular (Hunter 1997)
and spiral galaxies (Kennicutt 1983). The rates for the Magellanic Clouds are
marked (Kennicutt & Hodge 1986). Rates are normalized to the size
of the galaxy within a surface brightness of 25 mag/arcsec2.
The Halpha luminosities were corrected for internal extinction.
Right (or below): Normalized star formation rate plotted against integrated
galactic MB
Fig. 2. Concentration of stars formed in a region plotted
against the number of stars.
The top panel shows stars with MV < -4
and the bottom panel shows stars with masses 6.5-15 Msun.
The dotted line is that for normal OB associations in the Milky Way
and LMC (Massey et al. 1995; value in the lower panel deduced
from the IMF).
Values for 30 Doradus are deduced from survey by Parker & Garmany
(1993). Other references: Constellation III - Dolphin & Hunter (1998);
I Zw 18 - Hunter & Thronson (1995);
VII Zw 403 - Lynds et al. (1998);
NGC 604 - Hunter et al. (1996a);
NGC 206 - Hunter et al. (1996b);
R 136 - Hunter et al. (1996c)
Links (back/forward) to:
| First version: | 18th | February, | 1998
|
| Last update: | 25th | September, | 1998
|
Jochen M. Braun &
Tom Richtler
(E-Mail: jbraun|richtler@astro.uni-bonn.de)
