Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...311..721s&link_type=abstract
Astronomy and Astrophysics, v.311, p.721-730
Astronomy and Astrophysics
Astrophysics
21
Galaxies: Individual: Haro 3, Galaxies: Starburst, Galaxies: Abundances, Stars: Wolf-Rayet, Galaxies: Ism
Scientific paper
Broadband photometry and optical spectroscopy of the dwarf starburst galaxy Haro 3 (NGC 3353, Mkn 35) is presented. Despite its isolated location and relaxed outer morphology, Haro 3 is a dwarf galaxy dominated by multiple violent star forming regions. Emission line fluxes from the ionised gas of these starburst events show that the galaxy is underabundant in heavy elements by a factor of three compared with the Solar value. Age estimates for the starbursts calculated from emission line strengths suggest that the current episode of major star formation is under 5 million years old. Evidence for an underlying older stellar substrate is obtained from the detection of magnesium and iron absorption lines. The detection of emission features attributable to Wolf-Rayet stars in one of the HII regions also allows Haro 3 to be classified as a Wolf-Rayet galaxy. We discuss the possibilities that the current high rate of star formation was initiated by an interaction, gas cloud infall from the halo, or by stochastic self-propagating star formation.
McBreen Brian
Metcalfe Leo
Rabbette M.
Smith Nathan
Steel Simon J.
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