An Astrometric Calibration of the Cepheid Period-Luminosity Relation

Details An Astrometric Calibration of the Cepheid Period-Luminosity Relation An Astrometric Calibration of the Cepheid Period-Luminosity Relation

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10106b&link_type=abstract

HST Proposal ID #10106

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Hst Proposal Id #10106 Stellar Populations

Scientific paper

We propose to measure the parallaxes of 10 Galactic Cepheid variables. When these parallaxes {with 1-sigma precisions of 10% or better} are added to our recent HST FGS parallax determination of delta Cep {Benedict et al 2002}, we anticipate determining the Period-Luminosity relation zero point with a 0.03 mag precision. In addition to permitting the test of assumptions that enter into other Cepheid distance determination techniques, this calibration will reintroduce Galactic Cepheids as a fundamental step in the extragalactic distance scale ladder. A Period-Luminosity relation derived from solar metallicity Cepheids can be applied directly to extragalactic solar metallicity Cepheids, removing the need to bridge with the Large Magellanic Cloud and its associated metallicity complications.

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