======================================================================= The OGLE Collection of Variable Stars Classical Cepheids in the Small Magellanic Cloud I. Soszynski, A. Udalski, M. K. Szymanski, D. Skowron, G. Pietrzynski, R. Poleski, P. Pietrukowicz, J. Skowron, P. Mroz, S. Kozlowski, L. Wyrzykowski, K. Ulaczyk, and M. Pawlak ======================================================================= soszynsk@astrouw.edu.pl This directory contains the OGLE catalog classical Cepheids in the Small Magellanic Cloud. The directory structure is as follows: README - this file ident.dat - identification of stars cepF.dat - parameters of fundamental-mode (F) Cepheids cep1O.dat - parameters of first-overtone (1O) Cepheids cep2O.dat - parameters of second-overtone (2O) Cepheids cepF1O.dat - parameters of double-mode F/1O Cepheids cep1O2O.dat - parameters of double-mode 1O/2O Cepheids cep1O2O3O.dat - parameters of a triple-mode 1O/2O/3O Cepheid 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. (2015), Acta Astron. 65, 297, (arXiv:1601.01318) describing the catalog. Format of the file ident.dat: -------------------------------------------------------------------------- Bytes Format Units Description -------------------------------------------------------------------------- 1- 17 A17 --- Star's ID 19- 26 A8 --- Mode(s) of pulsation 29- 30 I2 h Right ascension, equinox J2000.0 (hours) 32- 33 I2 m Right ascension, equinox J2000.0 (minutes) 35- 39 F5.2 s Right ascension, equinox J2000.0 (seconds) 41 A1 --- Declination, equinox J2000.0 (sign) 42- 43 I2 deg Declination, equinox J2000.0 (degrees) 45- 46 I2 arcmin Declination, equinox J2000.0 (arc minutes) 48- 51 F4.1 arcsec Declination, equinox J2000.0 (arc seconds) 54- 69 A16 --- OGLE-IV ID 71- 85 A15 --- OGLE-III ID 87-101 A15 --- OGLE-II ID 103- A --- Other designation (from GCVS) -------------------------------------------------------------------------- Format of files cepF.dat, cep1O.dat, and cep2O.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 34- 44 F11.7 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 files cepF1O.dat and cep1O2O.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 34- 44 F11.7 days Longer period 46- 54 F9.7 days Uncertainty of the longer 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_31 101-110 F10.7 days Shorter period 112-120 F9.7 days Uncertainty of the shorter period 123-132 F10.5 days Time of maximum brightness (HJD-2450000) 135-139 F5.3 mag I-band amplitude (maximum-minimum) 142-146 F5.3 --- Fourier coefficient R_21 148-152 F5.3 --- Fourier coefficient phi_21 155-159 F5.3 --- Fourier coefficient R_31 161-165 F5.3 --- Fourier coefficient phi_31 -------------------------------------------------------------------------- Format of the file cep1O2O3O.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 34- 44 F11.7 days Longest period 46- 54 F9.7 days Uncertainty of the longest 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_31 101-110 F10.7 days Medium period 112-120 F9.7 days Uncertainty of the medium period 123-132 F10.5 days Time of maximum brightness (HJD-2450000) 135-139 F5.3 mag I-band amplitude (maximum-minimum) 142-146 F5.3 --- Fourier coefficient R_21 148-152 F5.3 --- Fourier coefficient phi_21 155-159 F5.3 --- Fourier coefficient R_31 161-165 F5.3 --- Fourier coefficient phi_31 167-176 F10.7 days Shortest period 178-186 F9.7 days Uncertainty of the shortest period 189-198 F10.5 days Time of maximum brightness (HJD-2450000) 201-205 F5.3 mag I-band amplitude (maximum-minimum) 208-212 F5.3 --- Fourier coefficient R_21 214-218 F5.3 --- Fourier coefficient phi_21 221-225 F5.3 --- Fourier coefficient R_31 227-231 F5.3 --- Fourier coefficient phi_31 -------------------------------------------------------------------------- Format of the files with photometry (phot/I/OGLE-SMC-CEP-NNNN.dat, phot/V/OGLE-SMC-CEP-NNNN.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 classical Cepheids in the Magellanic Clouds should include the appropriate reference(s) to OGLE paper(s). Updates: 2017-06-30 The collection extended with Cepheids from OGLE-SMC-CEP-4625 to OGLE-SMC-CEP-4987 detected in the OGLE-IV auxiliary photometric databases. Light curves of other objects supplemented with new observations. For details see: Soszynski et al. (2017), Acta Astron. 67, 103 (arXiv:1706.09452). 2018-06-04 Corrected erroneous calibration of the V-band photometry for 139 objects. 2018-07-12 Corrected erroneous calibration of the I-band photometry for 336 objects. 2019-07-04 The collection extended with Cepheid OGLE-SMC-CEP-4988 discovered by the Gaia team. For details see: Soszynski et al. (2019), Acta Astron. 69, 87 (arXiv:1907.02073). OGLE-SMC-CEP-4954 and OGLE-SMC-CEP-4957 reclassified as anomalous Cepheids and removed from this collection. OGLE-SMC-CEP-4952 reclassified from 1O to F. 2021-11-24 The collection extended with blended Cepheid OGLE-SMC-CEP-4989. 2022-08-20 6 additional classical Cepheids from the Gaia DR3 catalog (from OGLE-SMC-CEP-4990 to OGLE-SMC-CEP-4995) 2023-01-10 3 additional classical Cepheids (from OGLE-SMC-CEP-4996 to OGLE-SMC-CEP-4998)