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. =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: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table3.dat 77 1575 Photometric data, spectral types and coordinates of all stars observed in the open cluster NGC 2571 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 --- Seq Sequence number 6- 8 I3 --- Lind ? Number in Lindoff (1968ArA.....4..587L) notation 10- 12 I3 --- Clar ? Number in Claria (1976PASP...88..225C) notation 14- 16 I3 --- Kil ? Number in Kilambi (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 -------------------------------------------------------------------------------- Note (1): 1 = Houk (1982, Cat. ) 2 = Lindoff (1968ArA.....4..587L) 3 = Cannon & Pickering (1918-1924, Cat. ) 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) 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 ------------------------------------------------------------------------------- Acknowledgements: Edgard Giorgi ================================================================================ (End) Patricia Bauer [CDS] 31-Jan-2002