Red giants in the blue compact galaxy IZw18

Details Red giants in the blue compact galaxy IZw18 Red giants in the blue compact galaxy IZw18

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007astl...33..137t&link_type=abstract

Astronomy Letters, Volume 33, Issue 3, pp.137-148

Astronomy and Astrophysics

Astronomy

Scientific paper

Archival Hubble Space Telescope (HST) data have been used for the photometry of stars in blue compact dwarf (BCD) galaxies of the IZw18 system. Applying the spatial selection of stars, we have detected red giants, stars older than 1 2 Gyr, in the galaxies. These red giants have allowed the distance to IZw18 to be reliably determined for the first time: D = 13.9 ± 1.2 Mpc. The presence of old stars in the galaxies of the IZw18 system refutes the hypothesis about the observed primary star formation in these galaxies.

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