A Hubble Space Telescope Study of Two HII Regions in NGC 6822

Details A Hubble Space Telescope Study of Two HII Regions in NGC 6822 A Hubble Space Telescope Study of Two HII Regions in NGC 6822

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasp..111.1382o&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 111, Issue 765, pp. 1382-1391.

Astronomy and Astrophysics

Astronomy

16

Galaxies: Individual: Ngc Number: Ngc 6822, Galaxies: Irregular, Galaxies: Ism, Ism: H Ii Regions, Galaxies: Local Group

Scientific paper

We report on the study of the Hubble V and Hubble X H II regions in NGC 6822 with the Hubble Space Telescope employing emission-line and stellar filters. Calibration was made for both data sets, providing magnitudes for the stars and surface brightnesses for the nebulae. The forms of these H II regions are shown to be decidedly more complex than revealed by ground-based images, both having bright cores within more extended emission. The four OB associations within the images are shown to have ages of 5-10 million years. We conclude that the H II regions are sufficiently optically thick to be used as ultraviolet photon counters and hence indicators of the star formation rate.

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