ADC/CDS Standard Document for Catalog:/catalogs/2/2185/
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II/185 Photographic UBV Phot Star Cat Old Open Cluster NGC 188 (Frolov 1990
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Photographic UBV Photometry Star Catalogue of the Old Open Cluster NGC 188
Frolov V.N.
<Astron. Tsirk., 1544, 39 (1990)>
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ADC_Keywords: Magnitudes, photographic ; Photometry, UBV
Description:
The UBV magnitudes for 2171 stars within an 80'x 80' area centered on the
old open cluster NGC188 were determined using plates taken with the Schmidt
telescope of the Radio Astrophisical Observatory of the Latvian Academy of
Sciences (80/120/240cm).Three plates for each colour (limiting magnitudes
V=16.5) were measured with the help of the Pulkovo iris-photometer using
the photoelectric standards of A. Sandage (1962) and O. Eggen, A. Sandage
(1969). Characteristic curves were built separately for the bright (v<12.5)
and faint (12.5-16.5) stars for the sake of improving the quality. The
corrections to the magnitudes for colour equations were ignored because of
their minority. Standard errors of the star magnitudes are:
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| |sigma V | sigma B | sigma U
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Inter.er.| faint st. | 0.03 | 0.04 | 0.05
| bright st.| 0.03 | 0.02 | 0.02
Exter.er.| faint st. | 0.07 | 0.06 | 0.08
| bright st.| 0.06 | 0.05 | 0.08
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References:
Sandage A.R. 1962 ApJ, 135, 333
Eggen O.J., and Sandage A.R. 1969 ApJ, 158, 669
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
doc_01 80 87 Introduction
data_01.dat 96 2171 Catalog Data
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Byte-by-byte Description of file: data_01.dat
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Bytes Format Units Label Explanations
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1- n In --- --- ---
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(End) Gail L. Schneider [SSDOO/ADC] 25-Sep-1995