======================================================================= The OGLE Collection of Variable Stars RR Lyrae Stars 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, and M. Pawlak ======================================================================= soszynsk@astrouw.edu.pl This directory contains the OGLE catalog of RR Lyrae stars in the fields toward the Small Magellanic Cloud. The directory structure is as follows: README - this file ident.dat - identification of stars RRab.dat - parameters of RRab stars RRc.dat - parameters of RRc stars RRd.dat - parameters of RRd stars aRRd.dat - parameters of anomalous RRd stars phot/I/ - I-band OGLE-IV photometry of individual objects phot/V/ - V-band OGLE-IV photometry of individual objects phot.tar.gz - gzipped phot/ directory fcharts/ - finding charts of individual objects remarks.txt - remarks on selected objects paper.pdf - PDF version of the paper Soszynski et al. (2016), Acta Astron. 66, 131, (arXiv:1606.02727) describing the catalog. Format of the file ident.dat: -------------------------------------------------------------------------- Bytes Format Units Description -------------------------------------------------------------------------- 1- 19 A19 --- Star's ID 22- 25 A4 --- Subtype of RR Lyr star (RRab, RRc, RRd, aRRd) 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 GCVS and VSX) -------------------------------------------------------------------------- Format of the files RRab.dat and RRc.dat: -------------------------------------------------------------------------- Bytes Format Units Description -------------------------------------------------------------------------- 1- 19 A19 --- Star's ID 22- 27 F6.3 mag Intensity mean I-band magnitude 29- 34 F6.3 mag Intensity mean V-band magnitude 37- 45 F9.7 days Period 47- 55 F9.7 days Uncertainty of period 58- 67 F10.5 days Time of maximum brightness (HJD-2450000) 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 -------------------------------------------------------------------------- Format of the files RRd.dat and aRRd.dat: -------------------------------------------------------------------------- Bytes Format Units Description -------------------------------------------------------------------------- 1- 19 A19 --- Star's ID 22- 27 F6.3 mag Intensity mean I-band magnitude 29- 34 F6.3 mag Intensity mean V-band magnitude 37- 45 F9.7 days First-overtone period 47- 55 F9.7 days Uncertainty of first-overtone period 58- 67 F10.5 days Time of maximum brightness (HJD-2450000) 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_31 103-111 F9.7 days Fundamental-mode period 113-121 F9.7 days Uncertainty of fundamental-mode period 124-133 F10.5 days Time of maximum brightness (HJD-2450000) 136-139 F5.3 mag I-band amplitude (maximum-minimum) 143-147 F5.3 --- Fourier coefficient R_21 149-153 F5.3 --- Fourier coefficient phi_21 156-160 F5.3 --- Fourier coefficient R_31 162-166 F5.3 --- Fourier coefficient phi_31 -------------------------------------------------------------------------- Format of the files with photometry (phot/I/OGLE-SMC-RRLYR-NNNN.dat, phot/V/OGLE-SMC-RRLYR-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: OGLE-SMC-RRLYR-NNNN.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 RR Lyrae stars in the Galactic bulge should include the appropriate reference(s) to OGLE paper(s). Updates: 2017-06-30 The collection extended with objects from OGLE-SMC-RRLYR-6372 to OGLE-SMC-RRLYR-6574 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 61 objects. 2018-07-12 Corrected erroneous calibration of the I-band photometry for 358 objects. 2019-07-04 The collection extended with 140 RR Lyr stars from OGLE-SMC-RRLYR-6575 to OGLE-SMC-RRLYR-6714 detected in the OGLE-IV outer fields and discovered by the Gaia team. For details see: Soszynski et al. (2019), Acta Astron. 69, 87 (arXiv:1907.02073). 2022-08-20 74 additional RR Lyrae stars from the Gaia DR3 catalog (from OGLE-SMC-RRLYR-6715 to OGLE-SMC-RRLYR-6788) 2023-01-10 49 additional RR Lyrae stars (from OGLE-SMC-RRLYR-6789 to OGLE-SMC-RRLYR-6837)