%0 Generic %1 Chung2011 %A ?, %D 2011 %K early type upturn uv %T The effect of helium-enhanced stellar populations on the ultraviolet-upturn phenomenon of early-type galaxies %U http://arxiv.org/abs/1109.3463 %X Recent observations and modeling of globular clusters with multiple populations strongly indicate the presence of super helium-rich subpopulations in old stellar systems. Motivated by this, we have constructed new population synthesis models with and without helium-enhanced subpopulations to investigate their impact on the UV-upturn phenomenon of quiescent early-type galaxies. We find that our models with helium- enhanced subpopulations can naturally reproduce the strong UV-upturns observed in giant elliptical galaxies assuming an age similar to that of old globular clusters in the Milky Way. The major source of far-UV (FUV) flux, in this model, is relatively metal- poor and helium-enhanced hot horizontal branch stars and their progeny. The Burstein et al. (1988) relation of the F U V - V color with metallicity is also explained either by the variation of the fraction of helium-enhanced subpopulations or by the spread in mean age of stellar populations in early-type galaxies.

@misc{Chung2011, abstract = { Recent observations and modeling of globular clusters with multiple populations strongly indicate the presence of super helium-rich subpopulations in old stellar systems. Motivated by this, we have constructed new population synthesis models with and without helium-enhanced subpopulations to investigate their impact on the UV-upturn phenomenon of quiescent early-type galaxies. We find that our models with helium- enhanced subpopulations can naturally reproduce the strong UV-upturns observed in giant elliptical galaxies assuming an age similar to that of old globular clusters in the Milky Way. The major source of far-UV (FUV) flux, in this model, is relatively metal- poor and helium-enhanced hot horizontal branch stars and their progeny. The Burstein et al. (1988) relation of the F U V - V color with metallicity is also explained either by the variation of the fraction of helium-enhanced subpopulations or by the spread in mean age of stellar populations in early-type galaxies. }, added-at = {2011-09-19T02:33:15.000+0200}, author = {?}, biburl = {https://www.bibsonomy.org/bibtex/29585ecea6118c42d8ae4429a8c504853/miki}, description = {[1109.3463] The effect of helium-enhanced stellar populations on the ultraviolet-upturn phenomenon of early-type galaxies}, interhash = {118c955ef7cd867fc38c8e51de7fb203}, intrahash = {9585ecea6118c42d8ae4429a8c504853}, keywords = {early type upturn uv}, note = {cite arxiv:1109.3463Comment: 12 pages, 4 figures, 1 table, Accepted to ApJL}, timestamp = {2011-09-19T02:33:15.000+0200}, title = {The effect of helium-enhanced stellar populations on the ultraviolet-upturn phenomenon of early-type galaxies}, url = {http://arxiv.org/abs/1109.3463}, year = 2011 }