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Date and Time of the Query: 2019-04-21 T21:28:31 PDT
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For refcode 1993A&A...268...25B:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1993A&A...268...25B Models and observations of starbursts II. Starbursts in interacting galaxies K. Bernlohr Max-Planck-Institut fur Astronomie, Konigstuhl 17, W-6900 Heidelberg, Federal Republic of Germany Received June 20, accepted September 4, 1992 Abstract. The evolutionary models presented in paper I are applied to active and former starbursts in a sample of interacting galaxies. Special emphasis is given to fits of the spectra. CCD images and spectra were obtained at the 3.5 m and 2.2 m telescopes on Calar Alto, Spain. The models are used to estimate how long the observed active starbursts have been forming stars at the presently high rate and how long star formation has ceased in post-starburst galaxies. With these burst ages, the time delay between bursts in both components of interacting pairs of disk galaxies is determined. This time delay is found to be in the sense that the starbursts in the minor galaxies of these pairs started earlier than those in the major galaxies. While strong starbursts are found to be active for only about 2 x 10^7^ years, the time delay between the bursts in both components of the interacting pairs can be significantly larger. Delays of up to about 2 x 10^8^ years are found in the observed sample. The model fits are also used to test if the IMF in starbursts is compatible with the IMF in the solar neighbourhood and which modifications are in accordance with observations. In particular, the mass-to-luminosity ratios of strong central starbursts indicate a deficiency of low-mass stars in the starburst IMF. However, the required low-mass-star deficiency is smaller than previously believed. It can be either described by a lower mass cutoff of about 1-2 M_sun_ or by an IMF of a reduced slope. Model spectra with both kinds of IMF variations are in accordance with observed starburst spectra. Key words: galaxies: starburst - galaxies: evolution - galaxies: stellar content - galaxies: individual: NGC 7714, NGC 7715
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