Ultraviolet studies of the Magellanic Clouds. II - Internal extinction, formation of massive stars, comparison with other galaxies

Details Ultraviolet studies of the Magellanic Clouds. II - Internal extinction, formation of massive stars, comparison with other galaxies Ultraviolet studies of the Magellanic Clouds. II - Internal extinction, formation of massive stars, comparison with other galaxies

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....90...73v&link_type=abstract

Astronomy and Astrophysics, vol. 90, no. 1-2, Oct. 1980, p. 73-82.

Astronomy and Astrophysics

Astronomy

47

Interstellar Extinction, Magellanic Clouds, Stellar Evolution, Supergiant Stars, Ultraviolet Astronomy, Galactic Structure, Hertzsprung-Russell Diagram, Main Sequence Stars, Stellar Luminosity

Scientific paper

The absolute integrated UV fluxes of the Magellanic Clouds measured by the D 2 B-Aura satellite (Maucherat-Joubert et al., 1980, Paper I) are corrected from interstellar extinction. For the purpose of this correction, we give a detailed discussion of the internal extinction in these galaxies. The corrected fluxes at 1690 Å are compared to the flux calculated for the solar neighbourhood, and used to compare the rate of massive star formation in the three regions. The rate per unit mass of gas is similar in the Large Magellanic Cloud and near the Sun, but 4 times smaller in the Small Magellanic Cloud. We also build quantitative upper HR diagrams and we find that the number of stars contained in similar portions of these diagrams and normalized to the far UV luminosity is roughly the same in all three objects. However, the Small Cloud appears to have relatively more of the brightest stars than the Large Cloud, and the latter than the Galaxy. We discuss the inference of these results on the rate of star formation and the Initial Mass Function. We discuss also for the sake of comparison the case of the irregular galaxies IC 1613, NGC 1569, 4449, 4490, 6822, and of the blue compact galaxy IZw 18.

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