J/AcA/74/1 OGLE II-III-IV Galactic bulge rotating variables (Iwanek+, 2024)
The OGLE Collection of Variable Stars:
Over 18 000 Rotating Variables toward the Galactic Bulge.
Iwanek P., Soszynski I., Stepien K., Kozlowski S., Skowron J., Udalski A.,
Szymanski M.K., Wrona M., Pietrukowicz P., Poleski R., Mroz P., Ulaczyk K.,
Skowron D.M., Gromadzki M., Rybicki K., Mroz M.J., Ratajczak M.
<Acta Astron. 74, 1 (2024)>
=2024AcA....74....1I 2024AcA....74....1I (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way; Stars, variable ; Photometry ; Optical
Keywords: stars: activity - starspots - stars: flare - stars: rotation
Abstract:
Stellar rotation, a key factor influencing stellar structure and
evolution, also drives magnetic activity, which is manifested as spots
or flares on stellar surface. Here, we present a collection of 18443
rotating variables located toward the Galactic bulge, identified in
the photometric database of the Optical Gravitational Lensing
Experiment (OGLE) project. These stars exhibit distinct magnetic
activity, including starspots and flares. With this collection, we
provide long-term, time-series photometry in Cousins I- and Johnson
V-band obtained by OGLE since 1997, and basic observational
parameters, i.e., equatorial coordinates, rotation periods, mean
brightness, and brightness amplitudes in both bands. This is a unique
dataset for studying stellar magnetic activity, including activity
cycles.
Description:
We presented the collection of over 18000 rotating variables with
clear magnetic field manifestation, i.e., spots or flares. With this
paper, we provide long-term, time-series photometry in the Cousins I-
and Johnson V-band obtained from the second phase (since 1997) to the
current fourth phase of the OGLE project,
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ident.dat 122 18443 Identification of stars
rot.dat 57 18443 Parameters of rotating variables
remarks.dat 46 110 Remarks
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Byte-by-byte Description of file: ident.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Star's ID, OGLE-BLG-ROT-NNNNNN
21- 22 I2 h RAh Right ascension (J2000.0)
24- 25 I2 min RAm Right ascension (J2000.0)
27- 31 F5.2 s RAs Right ascension (J2000.0)
33 A1 --- DE- Declination sign (J2000.0)
34- 35 I2 deg DEd Declination (J2000.0)
37- 38 I2 arcmin DEm Declination (J2000.0)
40- 43 F4.1 arcsec DEs Declination (J2000.0)
45- 60 A16 --- OGLE-IV OGLE-IV ID
62- 76 A15 --- OGLE-III OGLE-III ID
78- 93 A16 --- OGLE-II OGLE-II ID
95-122 A28 --- OName Other designation (from VSX)
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Byte-by-byte Description of file: rot.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Star's ID, OGLE-BLG-ROT-NNNNNN
21- 26 F6.3 mag Vmag ?=- Intensity mean V-band magnitude
28- 32 F5.3 mag Vampl ?=- V-band amplitude of the primary period
34- 39 F6.3 mag Imag Intensity mean I-band magnitude
41- 45 F5.3 mag Iampl I-band amplitude of the primary period
47- 57 F11.6 d Period Primary period
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Byte-by-byte Description of file: remarks.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Star Star's ID, OGLE-BLG-ROT-NNNNNN
21- 46 A26 --- Rem Remark
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History:
Copied at https://www.astrouw.edu.pl/ogle/ogle4/OCVS/blg/rot/
(End) Patricia Vannier [CDS] 27-Aug-2025