Revision of Star-Formation Measures

Details Revision of Star-Formation Measures Revision of Star-Formation Measures

2008-07-11

arxiv.org/abs/0807.1913v1

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, to appear in IAU Symp. 255, Low-Metallicity Star Formation, ed. L. Hunt, S. Madden, & R. Schneider (Cambri

Scientific paper

10.1017/S1743921308024988

Rotation plays a major role in the evolution of massive stars. A revised grid of stellar evolutionary tracks accounting for rotation has recently been released by the Geneva group and implemented into the Starburst99 evolutionary synthesis code. Massive stars are predicted to be hotter and more luminous than previously thought, and the spectral energy distributions of young populations mirror this trend. The hydrogen ionizing continuum in particular increases by a factor of up to 3 in the presence of rotating massive stars. The effects of rotation generally increase towards shorter wavelengths and with decreasing metallicity. Revised relations between star-formation rates and monochromatic luminosities for the new stellar models are presented.

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