Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...451..176h&link_type=abstract
Astrophysical Journal v.451, p.176
Astronomy and Astrophysics
Astronomy
57
Galaxies: Local Group, Galaxies: Stellar Content, Galaxies: Structure, Ism: Abundances, Ism: H Ii Regions, Stars: Formation
Scientific paper
We present identifications, fluxes, and sizes for H II regions in three galaxies that are in or near the Local Group: WLM, UGC A86, and EGB 0427+63. A deep search for H II regions in a fourth galaxy, LGS 3, produced a negative result. Our results for UGC A86 indicate that, contrary to a previous suggestion, it is a single galaxy. Its disjointed appearance in broadband images apparently is caused by the presence of several star-forming regions of different ages. Our data, together with other information about it, especially its radial velocity, also suggest that this object is beyond the limits of the Local Group.
The H II regions of the three galaxies in which they were detected show normal luminosity functions that fit power laws and normal size distributions that are reasonably well fitted by an exponential function. The calculated star formation rates range from zero for LGS 3 to 0.014 Msun yr-1 for UGC A86.
Emission-line spectra of seven H II regions in the three galaxies allow abundances to be determined. We find that all are low in heavy elements, with mean values for O/H of approximately 7% solar.
Hodge Paul
Miller Bryan W.
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