Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.5404m&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #54.04; Bulletin of the American Astronomical Society, Vol. 24, p.1210
Astronomy and Astrophysics
Astronomy
Scientific paper
Irregular galaxies are an important setting for the study of star formation and how it propagates, as the gas motions are not dominated by the effects of spiral arms and less affected by rotation. Their star formation rates are in many cases comparable to those of spirals and the HII regions of both groups have similar characteristics. Past studies of non-interacting irregulars have found no convincing correlations between global star formation rates and any single global parameter such as abundance or total gas mass, suggesting that the processes which determine a galaxy's overall star formation rate are events occuring on small scales. We have made detailed measurements of three large irregular systems (NGC 1156, 4214 and 4449) to study their star formation on small and regional scales. Optical and near-infrared images of these galaxies have been taken with the Fred Lawrence Whipple Observatory 48-inch telescope, to study their stellar populations as a function of position. Longslit spectra at many positions across each galaxy and echelle spectra of the HII regions have been obtained with the Multiple Mirror Telescope. The spectra will be used to map out variations of velocity, excitation and metal abundance of the ionised interstellar medium. We present preliminary results on the ionised gas velocity field and a search for Wolf-Rayet stars.
Huchra John P.
McIntyre Vince J.
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