J/A+A/361/929 IC 4651 uvby photometry (Meibom, 2000)
New Color-magnitude Diagram for the Open Cluster IC 4651.
Deep Stroemgren uvby CCD photometry in a large field.
Meibom S.
<Astron. Astrophys. 361, 929 (2000)>
=2000A&A...361..929M 2000A&A...361..929M
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, uvby
Keywords: Galaxy: open clusters and associations: individual: IC 4651 -
stars: Hertzsprung-Russel (HR) and C-M diagrams
Description:
New accurate CCD photometry in the u, v, b and y bands of the
Stroemgren system filters has been obtained for 17640 stars to
approximately. V=20mag in a approximately 21' x 21' field centered
on the intermediate-age open cluster IC 4651. The observations was
obtained with the Danish 1.5-m telescope at the European Southern
Observatory, La Silla, Chile.
Table 1 contains information about the Date, Night, Filter, Exposure
time, Airmass, CCD rotation angle, and RA- , DE-offsets for all 89
frames.
Table 2 gives cross-references between the MEI-system (this paper)
and the Lindoff (1972A&AS....7..231L 1972A&AS....7..231L, IC 4651 NNN), Eggen
(1971ApJ...166...87E 1971ApJ...166...87E, Cl* IC 4651 Egg NN), Anthony-Twarog & Twarog
(1987AJ.....94.1222A 1987AJ.....94.1222A, Cl* IC 4651 AT 1-NNN, Cl* IC 4651 AT 2-NN),
and Anthony-Twarog et al. (1988AJ.....95.1453A 1988AJ.....95.1453A, Cl* IC 4651 AMC I-NNN,
Cl* IC 4651 AMC NNNN) identification numbers.
Table 3 is the final catalogue of the new Stroemgren uvby photometry,
ordered by MEI identification number. For each star, it gives the MEI
number, Global CCD x- and y-coordinates, J2000 coordinates , the new
y, b, v, and u magnitudes on the standard system, number of detections
of the individual stars, and their mean errors.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 42 89 Observation log for IC 4651
table2.dat 27 506 Cross-references between the new numbering
system, Meibom 2000 (prefix MEI), and previous
identification numbers of the stars in IC 4651
table3.dat 128 17640 ubvy photometry
table1.tex 145 148 LaTeX version of table1
table2.tex 123 811 LaTeX version of table2
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See also:
J/A+A/299/53 : Red giants in NGC 3680 and IC 4651 (Mermilliod+, 1995)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Frame Frame identification
10- 17 A8 "DD/MM/YY" Date Observation date
19- 20 A2 --- Night Night number
22 A1 ---- Filter [ubvy] Filter
24- 26 I3 s ExpTime Exposure time
28- 32 F5.3 --- Airmass Airmass
34- 36 I3 deg Rot CCD rotation angle
38- 39 I2 arcmin oRA α offset
41- 42 I2 arcmin oDE δ offset
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- MEI Meibom number (this paper)
7- 9 I3 --- IC4651 ? Lindoff (1972A&AS....7..231L 1972A&AS....7..231L) number (1)
11- 13 I3 --- Eggen ? Eggen (1971ApJ...166...87E 1971ApJ...166...87E) number (1)
15- 18 I4 --- AT ? Anthony-Twarog & Twarog (1987AJ.....94.1222A 1987AJ.....94.1222A)
number (1)
20- 22 I3 --- AMCI ? Twarog et al. (1988AJ.....95.1453A 1988AJ.....95.1453A) number
from CCD photometry (1)
24- 27 I4 --- AMC ? Twarog et al. (1988AJ.....95.1453A 1988AJ.....95.1453A) number
from photographic photometry (1)
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Note (1): The identifications in Simbad are:
Lindoff (1972A&AS....7..231L 1972A&AS....7..231L) : IC 4651 NNN
Eggen (1971ApJ...166...87E 1971ApJ...166...87E) : Cl* IC 4651 Egg NN
Anthony-Twarog & Twarog (1987AJ.....94.1222A 1987AJ.....94.1222A) :
Cl* IC 4651 AT 1-NNN for numbers as 1NNN
and Cl* IC 4651 AT 2-NN for numbers as 20NN
Twarog et al. (1988AJ.....95.1453A 1988AJ.....95.1453A):
CCD: Cl* IC 4651 AMC I-NNN
photographic: Cl* IC 4651 AMC NNNN
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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- 5 I5 --- MEI New stellar ID (prefix MEI)
6 A1 --- f_MEI [*] indicates correspondances in table2.
7 I1 --- Flag [0/7] Code indicating type of star (1)
9- 17 F9.3 pix Xpos Global CCD x-coordinate (total field)
19- 27 F9.3 pix Ypos Global CCD y-coordinate (total field)
29- 30 I2 h RAh Right Ascension J2000 (hour)
32- 33 I2 min RAm Right Ascension J2000 (minutes)
35- 39 F5.2 s RAs Right Ascension J2000 (seconds)
41 A1 --- DE- Declination sign (J2000)
42- 43 I2 deg DEd Declination J2000 (degrees)
45- 46 I2 arcmin DEm Declination J2000 (arcminutes)
48- 52 F5.2 arcsec DEs Declination J2000 (arcseconds)
54- 60 F7.4 mag ymag Stroemgren y magnitude of star on standard system
62- 63 I2 --- o_ymag Number of detections in the y filter
65- 70 F6.4 mag e_ymag Standard error of the weighted mean y magnitude
73- 79 F7.4 mag bmag Stroemgren b magnitude of star on standard system
81- 82 I2 --- o_bmag Number of detections in the b filter
84- 89 F6.4 mag e_bmag Standard error of the weighted mean b magnitude
91- 97 F7.4 mag vmag Stroemgren v magnitude of star on standard system
99-100 I2 --- o_vmag Number of detections in the v filter
102-107 F6.4 mag e_vmag Standard error of the weighted mean v magnitude
109-115 F7.4 mag umag Stroemgren u magnitude of star on standard system
117-118 I2 --- o_umag Number of detections in the u filter
120-125 F6.4 mag e_umag Standard error of the weighted mean u magnitude
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Note (1): The analysis of membership and duplicity leading
to the 8 categories (0-7) of the stars in IC 4651, is based on the
present data and additional radial-velocity information, and will be
the subject of a forthcoming paper.
Flag-codes:
0 : Field stars
1 : Single red giant members (9 stars)
2 : Single main-sequence members (29)
3 : Binary red giant members (9)
4 : Binary main-sequence members (34)
5 : Field stars determined from color-magnitude diagram analysis (17)
6 : "new" (discovered) main-sequence stars (654)
7 : "new" (discovered) red giant star candidates (2)
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History: Lindoff numbers of table2.dat corrected on 16-May-2002
Acknowledgements: S. Meibom
(End) Patricia Bauer [CDS] 11-Aug-2000