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 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:
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FileName Lrecl Records Explanations
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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
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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.
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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
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: atype.dat btype.dat
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Bytes Format Units Label Explanations
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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
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Jun-2004