Absolute Calibration of the PL-Relations for the Classical Cepheids Based on the HIPPARCOS Parallaxes and the Distances of the Magellanic Clouds |
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Authors: | H V Abrahamyan |
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Institution: | (1) V. A. Ambartsumyan Byurakan Astrophysical Observatory, Armenia |
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Abstract: | The zero points of the period-luminosity relations for the classical cepheids are calibrated based on the HIPPARCOS parallaxes of these stars. The calibrations are used to determine the distance moduli of the LMC and SMC: DM
LMC = 18m.569 ± 0m.117 and DM
SMC = 19m.070 ± 0m.119, respectively. It turns out that a calibration of the PL relations based on the distances of 25 FU classical cepheids in the galaxy by Gieren et al. yields a distance scale that is shorter by approximately 0m.20 than the calibrations based on the HIPPARCOS parallaxes. |
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Keywords: | stars Cepheids Galaxies LMC and SMC distances |
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