Optical and 21-cm line spectroscopic studies of some compact galaxies.

Summary. Spectra of two blue compact galaxies (VII Zw 403 and VII Zw 301) and of two blue galaxies with compact parts (NGC 4861 and I Zw 41) were obtained; all of them show emission lines. NGC 4861 appears as a normal rotating late-type galaxy, as previously stated by de Vaucouleurs,G and de Vaucouleurs, A.; in particular, its H i content is in agreement with this morphological type. The compact part could be a supergiant H II complex. In the double galaxy I Zw 41 evidence is obtained of rotation in the southern component while no significant red shift difference is observed between the two members. The 21-cm measures show that most of the mass of I Zw 41 is in the form of neutral hydrogen, as in other previously detected compact galaxies. VII Zw 301 has the mean characteristics of the class of the compact galaxies with emission lines described by Sargent Lastly, VII Zw 403 is found to have a slight blueshift of - 110 km s- The characteristics of its spectrum, particularly the evidence for absorption lines and the strength of the continuum seem to rule it out as a galactic object. It should perhaps be attributed to the class of dwarf compacts surveyed by Arp and Sargent. Key words: compact galaxies - 21-cm radiation - optical spectra-radial velocities