8. Conclusion

Observations of 39 nearby, mostly dwarf galaxies are presented in this work. The observations were carried out at the 1.2-m telescope of Observatoire de Haute-Provence (France) with B, V and ICousins filters. The sample of nearby galaxies with significant uncertainties in the total magnitude $B_{\rm T}$ was selected from the Principal Galaxy Catalogue.

Based on surface and integrated photometry of the observed galaxies we derived total B, V and I magnitudes and integrated B-V, V-I colours and also radii and magnitudes at the 25$^{\rm m}$ isophotal level.

It should be noted that B-V, V-I colours of the measured galaxies (corrected for galactic absorption) are well fitted by the following distribution: $(B-V)_0=0.85\times(V-I)_0-0.20$.

Azimuthally averaged surface brightness profiles were derived for 33 galaxies in each photometric band. Most of the measured galaxies can be well fitted by an exponential intensity law of brightness distribution in the whole profile or in its outer parts. The best-fitting exponential parameters are given for the galaxies.

The relations between absolute B-magnitudes and model central surface brightnesses in B band and scale lengths in B band are also presented. For comparison, similar data are given for spiral galaxies, nearby dwarf galaxies and low surface brightness galaxies from articles of different authors. Our sample galaxies span over a wide range of absolute B-magnitudes from $-12^{\rm m}$to $-20.5^{\rm m}$ and the exponential disk central surface brightnesses are distributed mostly in the range from 21 to 24.5 mag/sq s, except some bright spiral galaxies. Note that absolute magnitudes are weakly correlated with central surface brightnesses for the given data. The mean value of the central SB in B band is about 22.4 $\pm$ 0.8 for the measured galaxies (and the mean value in V band is about 22.1 $\pm$ 0.9 and in I band is about 21.3 $\pm$ 0.9). The scale lengths in B band are closely correlated with absolute B-magnitudes, and the area of nearby dwarf galaxies and the area of bright spiral (and LSB) galaxies are well-separated in the figure. The mean scale length value for the measured nearby dwarf galaxies is about 0.68 $\pm$ 0.40 kpc in B band.

Acknowledgements

I would like to thank I.D. Karachentsev for help in the sample selection and for consideration given to my work. I am also grateful to D.I. Makarov for useful discussions and also to G.G. Korotkova for her participation in data processing. I would like to thank also P. Prugniel, referee, for his valuable comments. This work is partially supported by INTAS grant No. 1390.