Peculiarities of the stellar population of bars in the LMC and other barred galaxies

Gusev, A.S.

Автор: Gusev A.S.
Сборник: NEW VIEWS OF THE MAGELLANIC CLOUDS
Серия: IAU SYMPOSIA
Том: 190
Год издания: 1999
Место издания: ASTRONOMICAL SOC PACIFIC 390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA
Первая страница: 349
Последняя страница: 350
Аннотация: The age distributions in the bar and disk of the Large Magellanic Cloud are studied using data for 262 clusters with known ages, of which 89 are located in the bar. The spatial distributions for clusters in different age groups are investigated. Epochs of active star formation are determined for the bar and disk of the LMC. The ages of the stellar populations in the bar differ from that for the galaxy as a whole: in the bar, there is a deficit of intermediate-age clusters (5 x 10(8) - 6 x 10(9) yr) and an excess of young clusters with ages 3 x 10(7) - 5 X 10(8) yr. This indicates that the star formation history in the bar differs from that in regions outside the bar at the same distances from the center of the galaxy. Data on the composition of the old stellar populations in the bar and the disk of the LMC and the spatial distribution of intermediate-age clusters in the galaxy suggest that the LMC bar formed (2 - 6) x 10(9) years ago. Deviation of colors of bars from the normal color sequence of galaxies on several two-color diagrams is found using multicolor surface photometry for eight barred galaxies. Using results of evolutionary synthesis modeling, I can model the abnormal colors of bars by an intermediate-age star (similar to10(9) yr) deficiency. I find that the deficiency of an intermediate-age stellar population is a general property of bars.
Добавил в систему: Гусев Александр Сергеевич

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Peculiarities of the stellar population of bars in the LMC and other barred galaxiesстатья

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