Computer Science
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2547s&link_type=abstract
HST Proposal ID #2547
Computer Science
Hst Proposal Id #2547
Scientific paper
We propose to determine Cepheid distances to nearby, highly resolved, late type galaxies, which have produced type I supernovae (SNeI). The purpose is to determine how good such SNe are as standard candles in the V band. The distances to these nearby galaxies and the galaxy groups of which they are members will also be directly important in mapping the very local Hubble expansion field. The present program is for IC 4182. We propose to determine the corrected distances using observations of a selected field in the program galaxy in the V, as well as in the I bands, so as to determine the internal absorption of each Cepheid by Freedman's method. Optimized periods and accurate mean magnitude determinations of the Cepheids are the main requirements. Color-magnitude diagrams of the brightest resolved stars will also be obtained and will improve our knowledge of this secondary calibrator. The ultimate purpose is to calibrate the SNeI, freed of absorption effects, for the determination of H_o. We do not propose to begin again the many steps required for the fundamental calibration of the P-L relation.Our more restricted program, which is a necessary complement to the more extensive Key "Hubble Constant" Project is complete within itself for the stated purpose.
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