======================================================================= The OGLE Collection of Variable Stars Type II Cepheids in the Small Magellanic Cloud I. Soszynski, A. Udalski, M. K. Szymanski, L. Wyrzykowski, K. Ulaczyk, R. Poleski, P. Pietrukowicz, S. Kozlowski, D. Skowron, J. Skowron, P. Mroz, K. Rybicki, and P. Iwanek ======================================================================= soszynsk@astrouw.edu.pl This directory contains the OGLE catalog type II Cepheids in the Small Magellanic Cloud. The directory structure is as follows: README - this file ident.dat - identification of stars t2cep.dat - parameters of type II Cepheids phot/I/ - I-band photometry of individual objects phot/V/ - V-band photometry of individual objects phot.tar.gz - gzipped phot/ directory fcharts/ - finding charts of individual objects remarks.txt - remarks on selected objects pap.pdf - PDF version of the paper Soszynski et al. (2018), Acta Astron. 68, 89, (arXiv:1807.00008) describing the collection. Format of the file ident.dat: -------------------------------------------------------------------------- Bytes Format Units Description -------------------------------------------------------------------------- 1- 17 A17 --- Star's ID 20- 24 A5 --- Subtype of type II Cepheids 27- 28 I2 h Right ascension, equinox J2000.0 (hours) 30- 31 I2 m Right ascension, equinox J2000.0 (minutes) 33- 37 F5.2 s Right ascension, equinox J2000.0 (seconds) 39 A1 --- Declination, equinox J2000.0 (sign) 40- 41 I2 deg Declination, equinox J2000.0 (degrees) 43- 44 I2 arcmin Declination, equinox J2000.0 (arc minutes) 46- 49 F4.1 arcsec Declination, equinox J2000.0 (arc seconds) 52- 67 A16 --- OGLE-IV ID 69- 83 A15 --- OGLE-III ID 85- 99 A15 --- OGLE-II ID 101- A --- Other designation (from GCVS) -------------------------------------------------------------------------- Format of the file t2cep.dat: -------------------------------------------------------------------------- Bytes Format Units Description -------------------------------------------------------------------------- 1- 17 A17 --- Star's ID 20- 25 F6.3 mag Intensity mean I-band magnitude 27- 32 F6.3 mag Intensity mean V-band magnitude 35- 44 F10.7 days Period 46- 54 F9.7 days Uncertainty of period 57- 66 F10.5 days Time of maximum brightness (HJD-2450000) 69- 73 F5.3 mag I-band amplitude (maximum-minimum) 76- 80 F5.3 --- Fourier coefficient R_21 82- 86 F5.3 --- Fourier coefficient phi_21 89- 93 F5.3 --- Fourier coefficient R_31 95- 99 F5.3 --- Fourier coefficient phi_31 -------------------------------------------------------------------------- Format of the files with photometry (phot/I/OGLE-SMC-T2CEP-NNN.dat, phot/V/OGLE-SMC-T2CEP-NNN.dat) -------------------------------------------------------------------------- Bytes Format Units Description -------------------------------------------------------------------------- 1- 10 F10.5 days Heliocentric Julian Day - 2450000 12- 17 F6.3 mag Magnitude 19- 23 F5.3 mag Uncertainty of magnitude -------------------------------------------------------------------------- Finding charts are gzipped Postscript images. The names of the files are in the form: ID.ps.gz. The finding charts are 60"x60" subframes of the I-band reference frames centered on the star. White cross marks the star. North is up and East to the left. Any presentation of the scientific analysis or usage of the data from the catalog of type II Cepheids in the Magellanic Clouds should include the appropriate reference(s) to OGLE paper(s).