This directory contains the distribution of the "OGLE Catalog of Cepheids
from the Small Magellanic Cloud".

***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.

See also the file README.PL for revised coefficients of PLC and PL
relations.

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

The directory structure is as follows:

README             -- this file

README.PL          -- revised coefficients of PL and PLC relation for SMC.

subdirectory paper/ -- Paper: "The Optical Gravitational Lensing Experiment.
                       Cepheids in the Magellanic Clouds. V. Catalog of 
                       Cepheids from the Small Magellanic Cloud."
                       A. Udalski, I. Soszynski,  M. Szymanski, M. Kubiak,
                       G. Pietrzynski, P. Wozniak, and K. Zebrun, 
                       Acta Astron. 1999, 49, 437 (astro-ph/9912096),
                       describing the catalog (Postscript version).

subdirectory smc_sc1/ -- the catalog of Cepheids from the SMC_SC1 field.

subdirectory smc_sc2/ -- the catalog of Cepheids from the SMC_SC2 field.

subdirectory smc_sc3/ -- the catalog of Cepheids from the SMC_SC3 field.

subdirectory smc_sc4/ -- the catalog of Cepheids from the SMC_SC4 field.

subdirectory smc_sc5/ -- the catalog of Cepheids from the SMC_SC5 field.

subdirectory smc_sc6/ -- the catalog of Cepheids from the SMC_SC6 field.

subdirectory smc_sc7/ -- the catalog of Cepheids from the SMC_SC7 field.

subdirectory smc_sc8/ -- the catalog of Cepheids from the SMC_SC8 field.

subdirectory smc_sc9/ -- the catalog of Cepheids from the SMC_SC9 field.

subdirectory smc_sc10/ -- the catalog of Cepheids from the SMC_SC10 field.

subdirectory smc_sc11/ -- the catalog of Cepheids from the SMC_SC11 field.


smc_sc*.tar  --  tar archive containing entire distribution of the Catalog
                 of the SMC_SC* field.

table1.dat   --   names and equatorial coordinates of the OGLE-II fields in 
                  the SMC.

table2.dat   --   red clump stars E(B-V) reddening in the SMC fields.

table4.dat   --   cross-identification of the same objects in the Catalog.

table5.dat   --   number of Cepheids, all stars and stars with I_0 < 17.5 
                  detected in the SMC fields.

dmcep        --   directory with double-mode Cepheids data.

socep        --   directory with second overtone Cepheids data.

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Catalog of each field has the following structure (e.g. catalog of
the SMC_SC1 field):

subdirectory fcharts  -- finding charts of individual objects; gzipped  
                         Postscript version. The file name is: object_id.ps.gz
                         The finding chart is a 60"x60" part of the I-band 
                         frame, centered on the star. White cross marks the
                         star. North is up and East to the left.

subdirectory phot     -- photometry of individual objects:

    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.

cat_smc_sc1.ps.gz  -- Postscript version of the Catalog of Cepheids
                      of the field SMC_SC1.

smc_sc1.tab        -- Table with basic data for Cepheids in the field
                      SMC_SC1. The columns are:
                      ID number, RA(2000), DEC(2000), P(days), T_0 (HJD) -
                      2450000, log10(P), I, V, B, B-V, V-I, W_I, E(B-V), I_0,
                      V_0, B_0, (B-V)_0, (V-I)_0, R_21, \phi_21, Classification. 
                      T_0 corresponds to maximum brightness, magnitudes are
                      intensity means, colors are differences of mean 
                      magnitudes transformed independently to the standard
                      system. Magic numbers 9.999 or 99.999 mean "no data". 


Any presentation of the scientific analysis or usage of the data from
the Catalog of Cepheids from the SMC should include the appropriate
reference(s) to OGLE paper(s).