We present surface photometry of the irregular galaxy NGC 3077 using two data sets: photographic plates and CCD images. Isophotal contours, luminosity and colour distributions as well as position angle and ellipticity curves show that NGC 3077 is similar to an elliptical galaxy in the outer regions with a disturbed blue centre. The outer isophotes 22‐25 mag/arcsec2 are approximately centred on the dynamical centre, showing no clear evidence of the interaction with M81, the inner ones are disturbed by the dominant contribution of a reddened young population.

We have developed an analytical method to investigate the stellar populations in a galaxy using the broad‐band colours. The method enables us to determine the relative contribution, spatial distribution and age for different stellar populations and gives a hint about the dust distribution in a galaxy. We apply this method to the irregular galaxy NGC 3077, using CCD images in U, B, V and R filters.

We have developed an analytical method to investigate the stellar populations in a galaxy using the broad-band colours. The method enables us to determine the relative contribution, spatial distribution and age for different stellar populations and gives a hint about the dust distribution in a galaxy. We apply this method to the irregular galaxy NGC 3077, using CCD images in U, B , V and R filters.

CCD observations in V, I and H α for NGC 3389 are used to present photometry of 61 HII regions. Their α and δ positions, diameters and their absolute luminosities have been determined. The luminosity and size distribution functions of the HII regions in NGC 3389 are discussed.

NGC 3077, an Irr II galaxy in the M81/M82 group of galaxies at 3.63 Mpc, suffered a tidal encounter with M81 about 400 Myr ago. Tidal structures of HI in this group of galaxies can best be seen in a VLA image by Yun et al. (1994).