I fixed some of the references and added some more text to the SJ. Assigned ID: 1108 ----- Attempting Submission 1 (Wed Feb 07 16:14:19 GMT 2007) ----- Phase I Proposal 1108 (prop) successfully submitted. ----- Attempting Submission 2 (Fri Feb 09 13:51:34 GMT 2007) ----- We propose to reduce and analyze WFPC2 images of 5 Local Group galaxies in order to identify and characterize their RR Lyrae variables. These galaxies, which include NGC 147, IC 10, LGS 3, Tucana, and Andromeda V, have no published variability studies using HST imaging.The presence of RR Lyrae variables would suggest that an old (Age >~ 10 Gyr) stellar population is present in these galaxies. In additon, because the minimum-light color of ab-type RR Lyraes is a constant irrespective of metallicity or period, these stars can be used to study the extinction properties of each galaxy. Furthermore, the period of ab-type RR Lyraes is directly related to their metal abundance so that we can also study the metallicity distribution function of each galaxy. Lastly, it is well known that RR Lyraes are excellent distance indicators allowing us to measure the distance of each galaxy.

RESOLVED STELLAR POPULATIONS 12 69638 false 0.0 false false false false false false SUPPORTED