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LMC Cepheids in the MACHO Database: Constraints on the Star Formation Rate and on Stellar Models

D F Bersier,Charles R Alcock,R A Allsman,D R Alves,Timothy S Axelrod,Andrew Cameron Becker,D P Bennett,Kem Holland Cook,K C Freeman,Kim Griest,J A Guern,Simon L Marshall,Dante Minniti,M J Lehner,Bruce A Peterson,M R Pratt,P J Quinn,A W Rodgers,William J Sutherland,Douglas L Welch,A B Tomaney,T Vandehei

ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES（1998）

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Abstract
We present the period distribution of Cepheids in the LMC based on MACHO data. We construct simple population synthesis models to interpret this distribution and derive constraints on evolutionary models. An increase of star formation about 100 Myr ago is necessary to explain the observed distribution. Short period Cepheids are not reproduced by evolution models. We propose that they are the "metal-rich" equivalent of anomalous Cepheids seen in dwarf spheroidal galaxies.
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star formation
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