======================================================================= The OGLE Collection of Variable Stars Classical Cepheids toward the Galactic bulge I. Soszynski, A. Udalski, M. K. Szymanski, L. Wyrzykowski, K. Ulaczyk, R. Poleski, P. Pietrukowicz, S. Kozlowski, D. M. Skowron, J. Skowron, P. Mroz, M. Pawlak, and A. Jacyszyn-Dobrzeniecka OGLE Collection of Galactic Cepheids A. Udalski, I. Soszynski, P. Pietrukowicz, M.K. Szymanski, D.M. Skowron, J. Skowron, P. Mroz, R. Poleski, S. Kozlowski, K. Ulaczyk, K. Rybicki, P. Iwanek and M. Wrona ======================================================================= soszynsk@astrouw.edu.pl udalski@astrouw.edu.pl This directory contains the OGLE collection of classical Cepheids toward the Galactic bulge. 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 cepF1O.dat - parameters of double-mode F/1O Cepheids cep1O2O.dat - parameters of double-mode 1O/2O Cepheids cep1O2O3O.dat - parameters of triple-mode 1O/2O/3O 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 pap1.pdf - PDF version of the paper Soszynski et al. (2017), Acta Astron. 67, 297 (arXiv:1712.01307), describing the collection. pap2.pdf - PDF version of the paper Udalski et al. (2018), Acta Astron. 68, 315 (arXiv:1810.09489), describing the extension of the collection to the outer Galactic bulge fields. pap3.pdf - PDF version of the paper Soszynski et al. (2020), Acta Astron. 70, 101 (arXiv:2007.07255), describing the extension of the collection. Format of the file ident.dat: -------------------------------------------------------------------------- Bytes Format Units Description -------------------------------------------------------------------------- 1- 16 A16 --- Star's ID 18- 25 A8 --- Mode(s) of pulsation 28- 29 I2 h Right ascension, equinox J2000.0 (hours) 31- 32 I2 m Right ascension, equinox J2000.0 (minutes) 34- 38 F5.2 s Right ascension, equinox J2000.0 (seconds) 40 A1 --- Declination, equinox J2000.0 (sign) 41- 42 I2 deg Declination, equinox J2000.0 (degrees) 44- 45 I2 arcmin Declination, equinox J2000.0 (arc minutes) 47- 50 F4.1 arcsec Declination, equinox J2000.0 (arc seconds) 53- 68 A16 --- OGLE-IV ID 70- 84 A15 --- OGLE-III ID 86-100 A15 --- OGLE-II ID 102- A --- Other designation (from VSX) -------------------------------------------------------------------------- Format of the files cepF.dat and cep1O.dat: -------------------------------------------------------------------------- Bytes Format Units Description -------------------------------------------------------------------------- 1- 16 A16 --- Star's ID 19- 24 F6.3 mag Intensity mean I-band magnitude 26- 31 F6.3 mag Intensity mean V-band magnitude 34- 43 F10.7 days Period 45- 53 F9.7 days Uncertainty of period 56- 66 F12.4 days Time of maximum brightness (HJD) 70- 74 F5.3 mag I-band amplitude (maximum-minimum) 77- 81 F5.3 --- Fourier coefficient R_21 83- 87 F5.3 --- Fourier coefficient phi_21 89- 94 F5.3 --- Fourier coefficient R_31 96-100 F5.3 --- Fourier coefficient phi_31 -------------------------------------------------------------------------- Format of the files cepF1O.dat and cep1O2O.dat: -------------------------------------------------------------------------- Bytes Format Units Description -------------------------------------------------------------------------- 1- 16 A16 --- Star's ID 19- 24 F6.3 mag Intensity mean I-band magnitude 26- 31 F6.3 mag Intensity mean V-band magnitude 34- 43 F10.7 days Longer period 45- 53 F9.7 days Uncertainty of the longer period 56- 67 F12.4 days Time of maximum brightness (HJD) 70- 74 F5.3 mag I-band amplitude (maximum-minimum) 77- 81 F5.3 --- Fourier coefficient R_21 83- 87 F5.3 --- Fourier coefficient phi_21 90- 94 F5.3 --- Fourier coefficient R_31 96-100 F5.3 --- Fourier coefficient phi_31 102-111 F10.7 days Shorter period 113-121 F9.7 days Uncertainty of the shorter period 124-135 F10.5 days Time of maximum brightness (HJD) 138-142 F5.3 mag I-band amplitude (maximum-minimum) 145-149 F5.3 --- Fourier coefficient R_21 151-155 F5.3 --- Fourier coefficient phi_21 158-162 F5.3 --- Fourier coefficient R_31 164-168 F5.3 --- Fourier coefficient phi_31 -------------------------------------------------------------------------- Format of the file cep1O2O3O.dat: -------------------------------------------------------------------------- Bytes Format Units Description -------------------------------------------------------------------------- 1- 16 A16 --- Star's ID 19- 24 F6.3 mag Intensity mean I-band magnitude 26- 31 F6.3 mag Intensity mean V-band magnitude 34- 43 F10.7 days Longest period 45- 53 F9.7 days Uncertainty of the longest period 56- 67 F12.4 days Time of maximum brightness (HJD) 70- 74 F5.3 mag I-band amplitude (maximum-minimum) 77- 81 F5.3 --- Fourier coefficient R_21 83- 87 F5.3 --- Fourier coefficient phi_21 90- 94 F5.3 --- Fourier coefficient R_31 96-100 F5.3 --- Fourier coefficient phi_31 102-111 F10.7 days Medium period 113-121 F9.7 days Uncertainty of the medium period 124-135 F10.5 days Time of maximum brightness (HJD) 138-142 F5.3 mag I-band amplitude (maximum-minimum) 145-149 F5.3 --- Fourier coefficient R_21 151-155 F5.3 --- Fourier coefficient phi_21 158-162 F5.3 --- Fourier coefficient R_31 164-168 F5.3 --- Fourier coefficient phi_31 170-179 F10.7 days Shortest period 181-189 F9.7 days Uncertainty of the shortest period 192-203 F10.5 days Time of maximum brightness (HJD) 206-210 F5.3 mag I-band amplitude (maximum-minimum) 213-217 F5.3 --- Fourier coefficient R_21 219-223 F5.3 --- Fourier coefficient phi_21 226-230 F5.3 --- Fourier coefficient R_31 232-236 F5.3 --- Fourier coefficient phi_31 -------------------------------------------------------------------------- Format of the files with photometry (phot/I/OGLE-BLG-CEP-NNN.dat, phot/V/OGLE-BLG-CEP-NNN.dat) -------------------------------------------------------------------------- Bytes Format Units Description -------------------------------------------------------------------------- 1- 13 F13.5 days Heliocentric Julian Day 15- 20 F6.3 mag Magnitude 22- 26 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 Galactic bulge should include the appropriate reference(s) to OGLE paper(s). Updates: 2020-07-16 37 additional classical Cepheids (from OGLE-BLG-CEP-169 to OGLE-BLG-CEP-205; Soszynski et al. 2020, Acta Astron. 70, 101) 2022-08-20 3 additional classical Cepheids from the Gaia DR3 catalog (from OGLE-BLG-CEP-206 to OGLE-BLG-CEP-208) 2024-03-26 - Update of the OGLE-IV light curves with new data points collected until February 2024. - Re-reduced OGLE-IV photometry in some fields. - The observation epochs are now provided in the format of full Heliocentric Julian Days. - OGLE-BLG-CEP-095 has been reclassified as an RR Lyrae star and moved to the OGLE Collection of RR Lyrae stars in the bulge (new designation: OGLE-BLG-RRLYR-09254) - OGLE-BLG-CEP-188 has been reclassified as a spotted variable star and removed from the Collection.