This directory contains paper and data on double mode Cepheids from the SMC.

***WARNING***

The content of this archive was revised on Apr. 1, 2000 due to revised
calibration of the OGLE photometric data. A small systematic effect in
the original calibration was found, mapped, and applied to the data.
This effect, caused by some scattered light in the instrument resulting
in non-perfect flat-fielding, affected only East/West edges of the
frames and amounted to 0.08 mag in the I-band and 0.05 mag in the B and
V-bands at the very edges of the field. On average the effect was very
small - of the order of 0.01-0.02 mag. 

We are very grateful to Dr. D.S. Graff (Ohio State University) for
pointing out to us this systematic effect.

*************

pap.ps.gz    --        Paper: "The Optical Gravitational Lensing Experiment.
                       Cepheids in the Magellanic Clouds. I. Double Mode
                       Cepheids in the Small Magellanic Cloud."
                       A. Udalski, I. Soszynski,  M. Szymanski, M. Kubiak,
                       G. Pietrzynski, P. Wozniak, and K. Zebrun, 
                       Acta Astron. 1999, 49, 1.

fig[1-8].ps.gz  --     Full size Figures 1-8.

app_[abc].ps.gz --     Catalog of double mode Cepheids. Appendix A -- finding
                       charts (60"x60" part of the I-band frame, North is up
                       and East to the left). Appendix B -- light curves of 
                       FU/FO Cepheids, Appendix C -- light curves of FO/SO
                       Cepheids.

tab1.txt        --     Table with basic data on FU/FO Cepheids (ASC-II format).

tab2.txt        --     Table with basic data on FO/SO Cepheids (ASC-II format).

phot.tar        --     tar archive of phot/ subdirectory.

subdirectory phot/  --     photometry of individual objects:
 
   subdirectory smc_sc*/ -- subdirectory with photometry of SMC_SC* field

      subdirectory  I/   -- photometry in the I-band
      subdirectory  V/   -- photometry in the V-band
      subdirectory  B/   -- photometry in the B-band
 
                         The file name is object_id.dat.gz in each of these
                         subdirectories. Each file contains 3 columns:
                         Hel JD, magnitude, error.