Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...533l.103p&link_type=abstract
The Astrophysical Journal, Volume 533, Issue 2, pp. L103-L105.
Astronomy and Astrophysics
Astronomy
18
Stars: Variables: Cepheids, Galaxies: Distances And Redshifts, Galaxies: Magellanic Clouds
Scientific paper
We selected Cepheids from the Optical Gravitational Lensing Experiment database for the Magellanic Clouds in the period range of 101.1<=P<=101.4 days. There were 33 objects in the LMC and 35 in the SMC. We find that the median amplitude of Cepheids in the LMC is 18% larger than in the SMC, a 4 σ effect. For a sample of 42 galactic Cepheids in the same period range, the median amplitude is 7% larger than in the LMC, suggesting that the higher the metal content the larger the amplitude. This implies that the period-flux amplitude relation is not universal and cannot be used to measure distances accurately, unless properly calibrated.
Paczyński Bohdan
Pindor Bart
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