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J/MNRAS/349/1059    OGLE variables in Galactic bar           (Wray+, 2004)

OGLE small-amplitude variables in the Galactic bar. Wray J.J., Eyer L., Paczynski B. <Mon. Not. R. Astron. Soc., 349, 1059-1068 (2004)> =2004MNRAS.349.1059W
ADC_Keywords: Stars, variable ; Photometry Keywords: stars: variables: other - Galaxy: bulge Abstract: Among over 200000 Galactic bulge variable stars in the public domain Optical Gravitational Lensing Experiment (OGLE) catalogue, we found over 15000 red giant variables following two well-defined period-amplitude relations. The periods are in the range 10<P<100d, and amplitudes in the range 0.005<A<0.13mag in the I band. The variables cover a broad range of reddening-corrected colours, 1<(V-I)0<5, and a fairly narrow range of extinction-corrected apparent magnitudes, 10.5<I0<13. A subset of variables (type A) has an rms scatter of only 0.44mag. The average magnitudes for these stars are well correlated with the Galactic longitude, and vary from Ik,0=11.82 for l=+8° to Ik,0=12.07 for l=-5°, clearly indicating that they are located in the Galactic bar. Most variables have several oscillation periods. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file field.dat 48 49 OGLE-II bulge fields (from J/AcA/51/175) atype.dat 193 8970 *Table of all relevant parameters for a sample of type A stars btype.dat 193 6399 *Table of all relevant parameters for a sample of type B stars
Note on atype.dat and btype.dat: In the period-amplitude diagram, in I band, two sequences, separated by two segments of diagonal solid line, are clearly visible. We call the sequence above and to the left of the line type A, and the sequence below and to the right of the line type B. Amplitudes are defined as half of the peak-to-peak amplitude for a given mode.
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/AcA/52/217 : OGLE VI photometry of Galactic Bulge (Udalski+, 2002) J/AcA/52/129 : DIA OGLE2 cand. variable stars catalog (Wozniak+, 2002) Byte-by-byte Description of file: field.dat
Bytes Format Units Label Explanations
1- 6 A6 --- --- [bul_sc] 7- 8 I2 --- Field [01/49] Field number 10- 11 I2 h RAh Field center right ascension (J2000) 13- 14 I2 min RAm Field center right ascension (J2000) 16- 19 F4.1 s RAs Field center right ascension (J2000) 21 A1 --- DE- Field center declination sign (J2000) 22- 23 I2 deg DEd Field center declination (J2000) 25- 26 I2 arcmin DEm Field center declination (J2000) 28- 29 I2 arcsec DEs Field center declination (J2000) 31- 36 F6.2 deg GLON [-12/11] Galactic longitude 38- 42 F5.2 deg GLAT Galactic latitude 45- 47 I3 --- Nobs Number of observations
Byte-by-byte Description of file: atype.dat btype.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Field [1/49] Field number, BUL-SC 4- 7 I4 --- Vno Variable number in the field, OGLE BUL-SCNN VNNNN 9- 14 I6 --- Sno [1/948935] OGLE star number, OGLE BUL-SCNN NNNNNN in Simbad 16- 17 I2 h RAh Right ascension (J2000) 18 A1 --- --- [:] 19- 20 I2 min RAm Right ascension (J2000) 21 A1 --- --- [:] 22- 26 F5.2 s RAs Right ascension (J2000) 28 A1 --- DE- Declination sign (J2000) 29- 30 I2 deg DEd Declination (J2000) 31 A1 --- --- [:] 32- 33 I2 arcmin DEm Declination (J2000) 34 A1 --- --- [:] 35- 38 F4.1 arcsec DEs Declination (J2000) 40- 46 F7.2 pix Xpos X position 48- 54 F7.2 pix Ypos Y position 56- 61 F6.3 mag Vmag V magnitude 63- 67 F5.3 mag AV Absorption in V band 69- 73 F5.3 mag V-I V-I colour index 75- 79 F5.3 mag E(V-I) Extinction in (V-I) 81- 86 F6.3 mag Imag I magnitude 88- 92 F5.3 mag AI Absorption in I band 94- 99 F6.3 mag Jmag ?=-9.999 2MASS J magnitude 101-106 F6.3 mag Hmag ?=-9.999 2MASS H magnitude 108-113 F6.3 mag Kmag ?=-9.999 2MASS K magnitude 116-123 F8.4 d Per Dominant period 127-133 F7.5 mag Amp Amplitude of the dominant period 135-143 F9.4 d Per2 ?=-99.9999 Second period found 145-153 F9.5 mag Amp2 ?=-99.99999 Amplitude of the second period 155-163 F9.4 d Per3 ?=-99.9999 Third period found 165-173 F9.5 mag Amp3 ?=-99.99999 Amplitude of the third period 175-183 F9.4 d Per4 ?=-99.9999 Fourth period found 185-193 F9.5 mag Amp4 ?=-99.99999 Amplitude of the fourth period
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Jun-2004
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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