J/AcA/52/369 OGLE II SMC RR Lyrae stars (Soszynski+, 2002)
The optical gravitational lensign experiment.
Catalog of RR Lyr stars from the Small Magellanic Cloud.
Soszynski I., Udalski A., Szymanski M., Kubiak M., Pietrzynski G.,
Wozniak P., Zebrun K., Szewczyk O., Wyrzykowski L.
<Acta Astron., 52, 369-396 (2002)>
=2002AcA....52..369S 2002AcA....52..369S (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Stars, variable ; Photometry ; Optical
Keywords: stars: variables: RR Lyr - Magellanic Clouds - catalogs
Abstract:
We present the catalog of RR Lyrae stars from 2.4 square degrees of
central parts of the Small Magellanic Cloud (SMC). The photometric
data were collected during four years of the OGLE-II microlensing
survey. Photometry of each star was obtained using the Difference
Image Analysis (DIA) method. The catalog contains 571 objects,
including 458 RRab, 56 RRc variables, and 57 double mode RR Lyr stars
(RRd). Additionally we attach a list of variables with periods between
0.18-0.26 days, which are probably delta Sct stars. Period, BVI
photometry, astrometry, amplitude, and parameters of the Fourier
decomposition of the I-band light curve are provided for each object.
We also present the Petersen diagram for double mode pulsators. We
found that the SMC RR Lyr stars are fairly uniformly distributed over
the studied area, with no clear correlation to any location. The most
preferred periods for RRab and RRc stars are 0.589 and 0.357 days,
respectively. We noticed significant excess of stars with periods of
about 0.29 days, which might be second-overtone RR Lyr stars (RRe).
The mean extinction free magnitudes derived for RRab stars are 18.97,
19.45 and 19.73 mag for the I, V and B-band, respectively. All
presented data, including individual BVI observations, are available
from the OGLE Internet archive.
Description:
Observations of the SMC were collected between June 26, 1997 and
November 25, 2000. Eleven driftscan fields (SMCSC1-SMCSC11)
covering about 2.4 square degrees of central parts of the SMC were
observed. The majority of frames were taken in the I photometric band
(about 280-340 epochs depending on the field). Other images were
collected through the V-band (typically about 30 epochs) and B-band
(about 20 epochs) filters. The effective exposure time lasted 125, 174
and 237 seconds for the I , V and B-band, respectively. Themedian
seeing was about 1.3" for our dataset.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 72 478 ab-type RR Lyrae stars from the SMC
table3.dat 72 58 c-type RR Lyrae stars from the SMC
table4.dat 76 59 d-type RR Lyrae stars from the SMC
table5.dat 72 20 Other variable stars from the SMC
table6.dat 43 25 Cross-identification of stars detected in the
overlapping regions
table9.dat 69 21 RR Lyr stars close to the SMC clusters
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See also:
ftp://sirius.astrouw.edu.pl/ogle/ogle2/var_stars/smc/rrlyr : OGLE Home Page
Byte-by-byte Description of file: table2.dat table3.dat table5.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Field Field name (SMC_SCNN)
10- 31 A22 --- Star Star name (OGLEHHMMSS.ss+DDMMSS.s)
33- 40 F8.6 d Per Period
42- 54 F13.5 d T0 Reference epoch (HJD)
56- 60 F5.2 mag Imag I magnitude
62- 66 F5.2 mag Vmag ?=- V magnitude
68- 72 F5.2 mag Bmag ?=- B magnitude
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Field Field name (SMC_SCNN)
10- 31 A22 --- Star Star name (OGLEHHMMSS.ss+DDMMSS.s)
33- 40 F8.6 d P1 First-overtone period
42- 49 F8.6 d P0 Fundamental period
51- 58 F8.6 d P1/P0 Period ratio
60- 64 F5.2 mag Imag K magnitude
66- 70 F5.2 mag Vmag ?=- V magnitude
72- 76 F5.2 mag Bmag ?=- B magnitude
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 22 A22 --- Star Star name (OGLEHHMMSS.ss+DDMMSS.s)
26- 33 A8 --- Field1 Field 1 name
36- 43 A8 --- Field2 Field 2 name
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Field Field name (SMC_SCNN)
12- 33 A22 --- Star Star name (OGLEHHMMSS.ss+DDMMSS.s)
37- 43 A7 --- Cluster Cluster name SMCNNNN
47- 53 A7 --- ACluster Alternative cluster name
58- 60 I3 arcsec Rad Cluster radius
68- 69 I2 arcsec Dist Distance from the center
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Feb-2023