Computer Science
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..220l&link_type=abstract
NOAO Proposal ID #2001A-0220
Computer Science
Scientific paper
Despite the efforts of Hipparcos, the RR Lyrae (RRL) absolute magnitude calibration, M_V(RR), remains uncertain at a level that 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. A promising new technique is to calibrate M_V(RR) in several nearby globulars whose distances have been accurately determined by white dwarf sequence fitting. NGC 3201 is one of two globulars on which this technique is best employed, yet no high-quality photometry is published for the RRL in NGC 3201. We obtained B,V,I photometry of these stars in 1999A using YALO, but the IR leg of ANDICAM was delayed. We now propose to complete the project by obtaining K-band time-series photometry of the cluster.
Cool Adrienne
Hippel Ted von
Layden Andrew
Sarajedini Ata
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