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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We have used surface photometry data for 100 barred galaxies to determine the UBVRIJHK surface brightnesses and color indices for the bars. Two peaks are observed in the distribution of the average bar B brightnesses: at 21.0(m)/arcsec(2) and 22.2(m)/arcsec(2), characteristic of late- and early-type galaxies, respectively. The average surface-brightness difference between the bar and the salary (within the 25.0(m)/arcsec(2) isophote) increases from 1.1(m)/arcsec(2) for SB0 galaxies to 2.3(m)/arcsec(2) for SBc-IBm galaxies. In (U - B)(0)-(B - V)(0). (B - V)(0)-(V - R)(0), and (B - V)(0)-(V - I)(0) two-color diagrams, for all morphological types, the bars are shifted leftward from normal color sequence for galaxies. This deviation is more pronounced for the outer than for the inner regions of the bars. Using evolutionary models, we show that this deviation is due to the scarcity of intermediate-age [(1-9) x 10(9) yrs] stars in bars. Possible origins for this anomalous composition of the stellar population are discussed. (C) 2000 MAIK "Nauka/Interperiodica".