OGLE Cepheids have Lower Amplitudes in SMC than in LMC

Details OGLE Cepheids have Lower Amplitudes in SMC than in LMC OGLE Cepheids have Lower Amplitudes in SMC than in LMC

2000-01-24

arxiv.org/abs/astro-ph/0001417v1

Astronomy and Astrophysics

Astrophysics

5 pages with 1 figure, AASTex latex, submitted on January 24, 2000 to The Astrophysical Journal Letters

Scientific paper

We selected cepheids from the OGLE database for the Magellanic Clouds in the period range 10^{1.1} < P < 10^{1.4} 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 sigma effect. This implies that the period - flux amplitude relation is not universal, and cannot be used to measure distances accurately.

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