The massive star content of the blue dwarf galaxy IZw 36 from Faint Object Camera observations

Details The massive star content of the blue dwarf galaxy IZw 36 from Faint Object Camera observations The massive star content of the blue dwarf galaxy IZw 36 from Faint Object Camera observations

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...288..413d&link_type=abstract

Astronomy and Astrophysics 288, 413-424 (1994)

Astronomy and Astrophysics

Astrophysics

11

Stars: Formation, Stars: Mass Function, Galaxies: Stellar Content, Ultraviolet: Galaxies, Galaxies: Izw 36

Scientific paper

We have observed the blue dwarf galaxy IZw 36 with the f/96 relay of the Faint Object Camera and have for the first time resolved massive stars, using the broad band filters F175W, F342W, F430W and F480LP. We have measured the fluxes of 143 of these objects and studied their characteristics in color-magnitude diagrams. A few stars may be red supergiants but their contribution to the integrated light is less than 5% in the F430W filter. The F175W-F430W color of the integrated stellar population is redder than expected from the current burst of star formation, suggesting therefore the presence of an older and unresolved underlying population. The ultraviolet measurements combined with synthetic photometry calculations allow us to place the massive stars in a bolometric magnitude vs. temperature diagram. In this diagram, the stars are compared to evolutionary tracks for different stellar masses. The current burst probably has an age less than 12 Myr. We infer an Initial Mass Function, with a power-law slope in the range -1.7 to -2.6 for masses M>20Msun_. This is consistent with most of the values reported for sites of star formation in the Galaxy and the Magellanic Clouds and does not support the view of an IMF flattening at low metallicity.

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