Date of Award

6-2012

Document Type

Open Access

Degree Name

Bachelor of Science

Department

Physics and Astronomy

First Advisor

Francis Wilkin

Language

English

Keywords

variable star population, photometry, astonomy, cosmos

Abstract

Observations of the globular cluster IC4499 were taken with the 1m telescope at Cerro Tololo and combined with archival data from multiple telescopes. These data were used to study the variable star population using CCD photometry, with observations in the U, B, V, R and I passbands. The period and the magnitudes have been measured for the RR Lyrae stars. We present light curves in all passbands for all 97 RR Lyrae stars. The magnitudes of the RR Lyrae stars are compared with those measured by Walker and Nemec (1996). The distribution of stars on the horizontal branch is compared with estimates from theoretical models, and we confirm the horizontal branch color limits to the instability strip reported by Walker and Nemec.

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