J/AcA/49/319 OGLE UBVI phot. in Baade's Window (Paczynski+, 1999)
The Optical Lensing Experiment. UBVI photometry of stars in Baade's Window
Paczynski B., Udalski A., Szymanski M., Kubiak M., Pietrzynski G.,
Soszynski I., Wozniak P., Zebrun K.
<Acta Astron., 49, 319 (1999)>
=1999AcA....49..319P 1999AcA....49..319P
ADC_Keywords: Photometry, UBVRI
Keywords: galaxy: center - Hertzsprung-Russel (HR) diagram - stars: abundances -
stars: fundamental parameters
Abstract:
We present UBVI photometry for 8530 stars in Baade's Window obtained
during the OGLE-II microlensing survey. Among these are over one
thousand red clump giants. 1391 of them have photometry with errors
smaller than 0.04, 0.06, 0.12, and 0.20 mag in the I, V, B, and
U-band, respectively. We constructed a map of interstellar reddening.
The corrected colors of the red clump giants: (U-B)0, (B-V)0, and
(V-I)0 are very well correlated, indicating that a single parameter
determines the observed spread of their values, reaching almost 2mag
in the (U-B)0. It seems most likely that heavy element content is
the dominant parameter, but it is possible that another parameter: the
age (or mass) of a star moves it along the same trajectory in the
color-color diagram as the metallicity. The current ambiguity can be
resolved with spectral analysis, and our catalog may be useful as a
finding list of red clump giants. We point out that these K giants are
more suitable for a fair determination of the distribution of
metallicity than brighter M giants. We also present a compilation of
UBVI data for 308 red clump giants near the Sun, for which Hipparcos
parallaxes are more accurate than 10%. Spectral analysis of their
metallicity may provide information about the local metallicity
distribution as well as the extent to which mass (age) of these stars
affects their colors.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 110 8530 UBVI photometry of 8530 stars in Baade's Window
table2.dat 110 1391 UBVI photometry of 1391 red clump giants in
Baade's Window
table3.dat 77 308 Hipparcos red clump giants
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/244 : OGLE General Catalog of Stars. I. (Szymanski+ 1996)
I/221 : The Magellanic Catalogue of Stars - MACS (Tucholke+ 1996)
II/213 : OGLE Galactic Bulge periodic variables (Udalski+ 1996)
J/A+AS/112/407 : OGLE variables in Sculptor dwarf galaxy (Kaluzny+, 1995)
J/A+AS/125/343 : OGLE RR Lyr stars in omega Cen (Kaluzny+ 1997)
J/AcA/46/389 : OGLE miscellaneous variable stars (Olech 1996)
J/AcA/48/147 : OGLE SMC BVI photometry (Udalski+ 1998)
J/AcA/48/175 : OGLE LMC clusters (Pietrzynski+ 1998)
J/AcA/48/289 : OGLE-I long-period & non-periodic variables (Zebrun 1998)
Byte-by-byte Description of file: table[12].dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- BUL-SC45 Identification number (1)
8- 9 I2 h RAh Right ascension (J2000)
11- 12 I2 min RAm Right ascension (J2000)
14- 18 F5.2 s RAs Right ascension (J2000)
20 A1 --- DE- Declination sign (J2000)
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 30 F4.1 arcsec DEs Declination (J2000)
32- 37 F6.3 mag Umag U magnitude
39- 43 F5.3 mag e_Umag rms uncertainty on Umag
45- 50 F6.3 mag Bmag B magnitude
52- 56 F5.3 mag e_Bmag rms uncertainty on Bmag
58- 63 F6.3 mag Vmag V magnitude
65- 69 F5.3 mag e_Vmag rms uncertainty on Vmag
71- 76 F6.3 mag Imag I magnitude
78- 82 F5.3 mag e_Imag rms uncertainty on Imag
84- 89 F6.3 mag U0mag Dereddened U magnitude
91- 96 F6.3 mag B0mag Dereddened B magnitude
98-103 F6.3 mag V0mag Dereddened V magnitude
105-110 F6.3 mag I0mag Dereddened I magnitude
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Note (1): OGLE BUL-SC45 NNNNNN in Simbad
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP Hipparcos (Cat. I/239) number
9- 10 I2 h RAh Right ascension (J2000)
12- 13 I2 min RAm Right ascension (J2000)
15- 19 F5.2 s RAs Right ascension (J2000)
21 A1 --- DE- Declination sign (J2000)
22- 23 I2 deg DEd Declination (J2000)
25- 26 I2 arcmin DEm Declination (J2000)
28- 32 F5.2 arcsec DEs Declination (J2000)
33- 37 F5.3 mag V-I V-I colour index
39- 43 F5.3 mag B-V B-V colour index
45- 49 F5.3 mag U-B U-B colour index
51- 55 F5.3 mag Vmag V magnitude
57- 61 F5.3 mag VMAG Absolute V magnitude
64- 69 F6.3 mag IMAG Absolute I magnitude
72- 77 F6.2 pc Dist Distance
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History:
Copied at ftp://sirius.astrouw.edu.pl/ogle/ogle2/baades_win/UBVI
(End) James Marcout, Patricia Bauer [CDS] 31-Jan-2000