An Astrometric Calibration of Population II Distance Indicators

Details An Astrometric Calibration of Population II Distance Indicators An Astrometric Calibration of Population II Distance Indicators

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11211b&link_type=abstract

HST Proposal ID #11211. Cycle 16

Astronomy and Astrophysics

Astrophysics

Scientific paper

In 2002 HST produced a highly precise parallax for RR Lyrae. That measurement resulted in an absolute magnitude, MV= 0.61+/-0.11, a useful result, judged by the over ten refereed citations each year since. It is, however, unsatisfactory to have the direct, parallax-based, distance scale of Population II variables based on a single star. We propose, therefore, to obtain the parallaxes of four additional RR Lyrae stars and two Population II Cepheids, or W Vir stars. The Population II Cepheids lie with the RR Lyrae stars on a common K-band Period-Luminosity relation. Using these parallaxes to inform that relationship, we anticipate a zero-point error of 0.04 magnitude. This result should greatly strengthen confidence in the Population II distance scale and increase our understanding of RR Lyrae star and Pop II Cepheid astrophysics.;

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