The H II regions of Sextans A

Details The H II regions of Sextans A The H II regions of Sextans A

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasp..106..765h&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 106, no. 701, p. 765-769

Astronomy and Astrophysics

Astronomy

23

Dwarf Galaxies, Emission Spectra, H Ii Regions, Irregular Galaxies, Line Spectra, Luminosity, Morphology, Size Determination, Charge Coupled Devices, Continuous Spectra, H Alpha Line, H I Regions, Local Group (Astronomy)

Scientific paper

Calibrated H-alpha and continuum CCD frames are used to measure the emission-line luminosities, sizes, and morphological charateristics of 25 H II regions in the dwarf irregular galaxy Sextans A, a probable member of the Local Group. The luminosity function fits a power law with slope -1.70 and the size distribution is roughly exponential with a scale length of 62 pc. We identify 56 candidate exciting stars, from which we find that the estimated ultraviolet flux in the H II regions is approximately proportional to the H-alpha flux. Comparison with the H I distribution shows good positional agreement, except with an approximate 300 pc offset of H-alpha peak from H I peak.

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