Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984azh....61.1063d&link_type=abstract
(Astronomicheskii Zhurnal, vol. 61, Nov.-Dec. 1984, p. 1063-1073) Soviet Astronomy (ISSN 0038-5301), vol. 28, Nov.-Dec. 1984, p.
Astronomy and Astrophysics
Astronomy
1
Astronomical Photometry, Color-Magnitude Diagram, Elliptical Galaxies, Galactic Evolution, Spiral Galaxies, Ubv Spectra, Electrophotometry, Lenticular Bodies, Stellar Composition, Stellar Evolution
Scientific paper
The properties of type EE and ES double galaxies are studied, using Tomov's UBV photoelectric photometry. Paired early-type galaxies have different color/absolute-magnitude diagrams from those belonging to groups. Since the (U-V)t0 colors of paired E, S0 galaxies are wholly uncorrelated with their absolute magnitude M(v), pair members evolve differently from group and cluster members. The same conclusion is drawn from comparison of the integrated photometric properties of the E, S0 galaxies in EE and in ES pairs: their color dispersion is greater than for group and cluster members, while the Holmberg color match and the M(v) correlation between pair components depend on morphological type, dynamical and kinematic behavior, and whether interaction is present. Thus the evolution of paired galaxies is controlled less by their intrinsic properties than by external factors. Star-formation bursts may alternate in the two pair components, accompanying active mass-exchange processes, but the evolution of the pairs in the sample studied will not be significantly affected by dynamical friction.
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