J/A+A/381/884 UBVI CCD photometry in NGC 2571 (Giorgi+, 2002)
NGC 2571: An intermediate-age open cluster with a white dwarf candidate.
Giorgi E.E., Vazquez R.A., Baume G., Seggewiss W., Will J.-M.
<Astron. Astrophys. 381, 884 (2002)>
=2002A&A...381..884G 2002A&A...381..884G
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI
Keywords: open clusters and associations: individual: NGC 2571 -
stars: luminosity function, mass function, H-R diagrams -
stars: chemically peculiar, stars: blue stragglers
Description:
CCD UBVI imaging photometry was carried out in the field of the open
cluster NGC 2571. From the analysis of our data we state the cluster
is at a distance of 1380±130pc and its age is 50±10x10^6yr. The
cluster mass function has a slope larger than a typical Salpeter's
law. There are two notorious features in NGC 2571: the cluster
contains a high proportion of stars located below the reference line
that are serious candidates to be metallic line stars (probably
Am-Fm), and shows also a sharp gap along its main sequence that cannot
be explained by a random process nor by a biased rejection of cluster
members. A striking blue object was detected in the cluster field that
could be a white dwarf candidate.
We carried out CCD imaging photometry in the Kron-Cousins UBVI system
on April 27 and 29, 1994 using a 1024x1024pix CCD with a scale of
0.37"/pix and a field of view of 6.3'x6.3' attached to the 1.54-m
Danish telescope at ESO, La Silla, Chile.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 77 1575 Photometric data, spectral types and coordinates
of all stars observed in the open cluster NGC 2571
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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- 4 I4 --- Seq Sequence number
6- 8 I3 --- Lind ? Number in Lindoff (1968ArA.....4..587L 1968ArA.....4..587L) notation
10- 12 I3 --- Clar ? Number in Claria (1976PASP...88..225C 1976PASP...88..225C) notation
14- 16 I3 --- Kil ? Number in Kilambi (1978PASP...90..721K 1978PASP...90..721K) notation
18- 21 A4 --- SpType Spectral Type
22 A1 --- --- [,]
23- 24 A2 --- SpType2 Spectral Type
26 I1 --- r_SpType ? Reference number for SpType (1)
27 A1 --- --- [,]
28 I1 --- r_SpType2 ? Reference number for SpType2 (1)
30- 37 A8 --- Com Comments
39- 45 F7.2 pix Xpos X position (2)
47- 53 F7.2 pix Ypos Y position (2)
55- 59 F5.2 mag Vmag V Kron-Cousins magnitude (3)
61- 65 F5.2 mag B-V B-V Kron-Cousins color index (3)
67- 71 F5.2 mag U-B ? U-B Kron-Cousins color index (3)
73- 77 F5.2 mag V-I ? V-I Kron-Cousins color index
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Note (1): 1 = Houk (1982, Cat. III/80)
2 = Lindoff (1968ArA.....4..587L 1968ArA.....4..587L)
3 = Cannon & Pickering (1918-1924, Cat. III/135)
Note (2): 1 pix = 0.37". East to the left, North to the top.
Note (3): Photometric differences in V, B-V and U-B with
Claria (1976PASP...88..225C 1976PASP...88..225C)
star 5: 0.09, -0.14, 0.09
star 21: 0.01, -0.10, 0.15
star 22: 0.10, -0.13, -0.07
star 24: 0.04, -0.13, 0.12
star 27: 0.12, -0.14, -0.04
star 30: 0.31, -0.07, 0.01
star 33: 0.00, -0.23, 0.09
star 38: 0.44, -0.18, 0.07
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Acknowledgements: Edgard Giorgi
(End) Patricia Bauer [CDS] 31-Jan-2002