Friday, April 27, 2012
A steep IMF in luminous early-type galaxies
Paper is in prep...
Background papers
"A substantial population of low-mass stars in luminous elliptical galaxies"
"Confirmation of Enhanced Dwarf-sensitive Absorption Features in the Spectra of Massive Elliptical Galaxies: Further Evidence for a Non-universal Initial Mass Function"
"Counting Low-mass Stars in Integrated Light"
"A systematic variation of the stellar initial mass function in early-type galaxies"
"Variations in the Stellar IMF: from Bottom to Top"
Background papers
"A substantial population of low-mass stars in luminous elliptical galaxies"
"Confirmation of Enhanced Dwarf-sensitive Absorption Features in the Spectra of Massive Elliptical Galaxies: Further Evidence for a Non-universal Initial Mass Function"
"Counting Low-mass Stars in Integrated Light"
"A systematic variation of the stellar initial mass function in early-type galaxies"
"Variations in the Stellar IMF: from Bottom to Top"
Friday, April 13, 2012
The Effects of Stellar Rotation. I. Impact on the Ionizing Spectra and Integrated Properties of Stellar Populations
Abstract by Claus Leitherer et al.
We present a sample of synthetic massive stellar populations created using the Starburst99 evolu- tionary synthesis code and new sets of stellar evolutionary tracks, including one set that adopts a detailed treatment of rotation. Using the outputs of the Starburst99 code, we compare the popula- tions’ integrated properties, including ionizing radiation fields, bolometric luminosities, and colors. With these comparisons we are able to probe the specific effects of rotation on the properties of a stellar population. We find that a population of rotating stars produces a much harder ionizing radi- ation field and a higher bolometric luminosity, changes that are primarily attributable to the effects of rotational mixing on the lifetimes, luminosities, effective temperatures, and mass loss rates of mas- sive stars. We consider the implications of the profound effects that rotation can have on a stellar population, and discuss the importance of refining stellar evolutionary models for future work in the study of extragalactic, and particularly high-redshift, stellar populations.
Background Paper
"The Effects of Stellar Rotation. I. Impact on the Ionizing Spectra and Integrated Properties of Stellar Populations"
Levesque et al. 2012
Talk Slides
pdf
We present a sample of synthetic massive stellar populations created using the Starburst99 evolu- tionary synthesis code and new sets of stellar evolutionary tracks, including one set that adopts a detailed treatment of rotation. Using the outputs of the Starburst99 code, we compare the popula- tions’ integrated properties, including ionizing radiation fields, bolometric luminosities, and colors. With these comparisons we are able to probe the specific effects of rotation on the properties of a stellar population. We find that a population of rotating stars produces a much harder ionizing radi- ation field and a higher bolometric luminosity, changes that are primarily attributable to the effects of rotational mixing on the lifetimes, luminosities, effective temperatures, and mass loss rates of mas- sive stars. We consider the implications of the profound effects that rotation can have on a stellar population, and discuss the importance of refining stellar evolutionary models for future work in the study of extragalactic, and particularly high-redshift, stellar populations.
Background Paper
"The Effects of Stellar Rotation. I. Impact on the Ionizing Spectra and Integrated Properties of Stellar Populations"
Levesque et al. 2012
Talk Slides
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