Figure 13

Figure 13

Gas ionized by young stars in M31 shines in the light of the Halpha emission line. This HIII region is typical of a moderate scale star-forming complex in the M312 "ring of fire". Locations like these provide outstanding opportunities to study properties of relatively metal-rich massive stars. This image was obtained by Jay Gallagher, Wanda Ashman, and Eric Wilcots with the 3.5-m WIYN telescope with 0.6 arcsec FWHM seeing. This false color image is about 1.2 arcmin in width.