Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998larm.confe.133a&link_type=abstract
"IX Latin American Regional IAU Meeting, "Focal Points in Latin American Astronomy", held in Tonantzintla, Mexico, Nov 9-13, 199
Astronomy and Astrophysics
Astronomy
Scientific paper
We present here photometric and spectroscopic observations ofthe system ESO 296-IG 11, composed of two galaxies, as well as observations of a small galaxy 1'.3 distant. Colors through the whole system show little variations and reflect about the same young stellar composition. The quite blue colors of the observed regions in both galaxies of the system indicate star formation activity, and the distribution of the regions through their bodies suggests that a quite generalized starburst has taken place. The spectra of these regions are characteristic of H II regions of comparatively high excitation; their oxygen and nitrogen abundances are low, and their N(N)/N(O) ratios are comparable to those of the Magellanic Clouds and late type spiral galaxies. The low abundances of the regions would be consistent with the ages derived for the burts of star formation in their interiors. The high equivalent widths of the Halfa + [N II] emission lines of the integrated spectra of both galaxies indicate enhanced star formation compared with isolated ones, and are compatible with those observed in mergers of two disk galaxies. The velocities indicate that the two galaxies are a physical pair, and they are linked with the small nearby galaxy. The derived information suggests that ESO 296-IG 11 is composed of two advanced late type galaxies with similar general properties, and constitutes a triple system together with the small galaxy.
Agiero E. L.
Gunthardt Guillermo
Paolantonio S.
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