Computer Science
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop...85l&link_type=abstract
NOAO Proposal ID #1999A-0085
Computer Science
Scientific paper
Despite the efforts of Hipparcos, the RR Lyrae (RRL) absolute magnitude calibration, M_V(RR), remains uncertain at a level which critically compromises these stars' use as standard candles. This uncertainty propagates into globular cluster ages, Galactic formation scenarios, limits on the age of the Universe, and estimates of the Hubble Constant. Reviewers have concluded that fitting globular cluster white dwarf (WD) sequences to field WDs with observed trigonometric parallaxes, or to theoretical WD cooling curves, has the potential to provide a precise estimate of M_V(RR). We have proposed deep HST WFPC2 Cycle 8 imaging of the WD sequences in NGC 3201, a nearby globular rich in RRL. We herein propose observations with the YALO telescope to obtain comprehensive B,V,I,J,K CCD photometry of the RRL in this cluster, data which are currently lacking. These data are essential for an accurate measurement of M_V(RR), since they (1) define the mean apparent magnitudes of the RRL, (2) enable us to transform our HST photometry to the V_J and I_KC systems, and (3) improve the reddening estimate to the cluster.
Cool Adrienne
Hippel Ted von
Layden Andrew
Sarajedini Ata
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