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astro-ph2000★ 103 cited
Deep HST Imaging of IC 1613. I. Variable Stars and Distance
Andrew E. Dolphin, A. Saha, Evan D. Skillman +6
We present WFPC2 VI photometry of a field in the halo of IC 1613, finding 13 RR Lyraes and 11 Cepheids. Our photometry of the red giant branch tip and red clump is used to derive d…
astro-ph2000★ 12 cited
On the Determination of the He Abundance in Extragalactic H II Regions
Keith A. Olive, Evan D. Skillman
Of the light element abundances capable of testing standard big bang nucleosynthesis, only He4 is measured with an accuracy of a few percent. Thus, it is imperative to establish a…