J/AJ/104/1765 Faint Stroemgren photometry (von Hippel 1992)
Galactic structure from faint Stroemgren photometry: the catalog
of observations
von Hippel T.A.
<Astron. J. 104, 1765 (1992)>
=1992AJ....104.1765V 1992AJ....104.1765V
ADC_Keywords: Photometry, uvby
Abstract:
We have initiated a faint photometric survey in the Stroemgren system
covering ∼1 square degree and including 1238 objects in order to develop
samples which best probe the thick disk population. The catalog of
observations are presented here. They were acquired without kinematic
or metallicity biases and are complete to V=17.3-18.5, depending on
the field, for 810 early to relatively late type (K0 V or G5 III)
stars. Photometric metallicities were derived for 508 stars and
indicate a metal-poor stellar population, consistent with a mixture of
thick disk and halo stars. While the Stroemgren u-band was not part of
the survey, follow-up u-band observations of 32 survey objects
indicate that intermediate color survey stars (0.3≤b-y≤0.5) are
main-sequence or slightly evolved stars, while redder survey stars
(b-y≥0.5) are giants. The survey catalog is available in electronic
form upon request.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 75 1175 Stroemgren survey photometry
table5.dat 56 32 uvby observations
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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- 4 F4.1 --- Field Field number
6- 8 I3 --- Id Identification number in the field
10- 11 I2 h RAh Right ascension (1950)
13- 14 I2 min RAm Right ascension (1950)
16- 19 F4.1 s RAs Right ascension (1950)
21 A1 --- DE- Declination sign
22- 23 I2 deg DEd Declination (1950)
25- 26 I2 arcmin DEm Declination (1950)
28- 29 I2 arcsec DEs Declination (1950)
31- 35 F5.2 mag Vmag Apparent V magnitude
37- 41 F5.2 mag b-y b-y colour index
43- 47 F5.2 mag v-b v-b colour index
49- 53 F5.3 mag e_vmag rms uncertainty on v magnitude
55- 56 I2 --- o_vmag Number of observations in v magnitude
58- 63 F6.3 mag e_bmag rms uncertainty on b magnitude
65- 66 I2 --- o_bmag Number of observations in b magnitude
68- 72 F5.3 mag e_ymag rms uncertainty on y magnitude
74- 75 I2 --- o_ymag Number of observations in y magnitude
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 4 F4.1 --- Field Field number
5 A1 --- --- [-]
6- 8 I3 --- Id Identification number in the field
11- 15 F5.2 mag Vmag V magnitude
17- 21 F5.2 mag b-y b-y colour index
23- 27 F5.2 mag v-b v-b colour index
29- 32 F4.2 mag u-v u-v colour index
36- 39 F4.2 mag e_ymag rms uncertainty on ymag
41- 44 F4.2 mag e_bmag rms uncertainty on bmag
47- 50 F4.2 mag e_vmag rms uncertainty on vmag
53- 56 F4.2 mag e_umag rms uncertainty on umag
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History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 16-May-1997