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J/A+A/542/A68       NGC 3231, 7055 and 7127 BVRI photometry    (Paunzen+, 2012)

BVRI photometry of NGC 3231, NGC 7055, and NGC 7127. Paunzen E., Hermansson L., Holmstroem P. <Astron. Astrophys. 542, A68 (2012)> =2012A&A...542A..68P
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI Keywords: open clusters and associations: general - open clusters and associations: individual: NGC 3231 - open clusters and associations: individual: NGC 7055 - open clusters and associations: individual: NGC 7127 Abstract: Open clusters are often used as tracers for the formation and evolution of the Milky Way. But they can also be used to study distinct "local stellar populations" and all kind of stellar groups. All these studies crucially depend on their unambiguous detection and classification separating them from the fore- and background field population. Still more than one third of the catalogued galactic open clusters are unstudied to date. We have chosen three northern open cluster fields, namely NGC 3231, NGC 7055, and NGC 7127 which have been never studied before to shed more light on their true nature. We present Johnson-Cousins BVRI photometry down to V=19mag. After the transformation to the standard systems, colour-magnitude diagrams were generated. These diagrams were used to fit solar abundant isochrones to determine the distance modulus, reddening and apparent age of the main sequences. From the analysis of the colour-magnitude diagrams and the available proper motions we conclude that NGC 7055 and NGC 7127 are young, real, open clusters. NGC 3231, on the other hand, is probably a high galactic latitude open cluster remnant. Description: Photometric CCD BVRI measurements of objects within the open cluster candidates NGC 3231, NGC 7055, and NGC 7127 were obtained at the Sandvreten Observatory (Uppsala, Sweden). Objects: -------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------- 10 27 29 +66 47 54 NGC 3231 = NGC 3231 21 19 30 +57 36 00 NGC 7055 21 43 41 +54 37 48 NGC 7127 = C 2142+543 -------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 69 39 Observed program stars of NGC 3231 table2.dat 69 251 Observed program stars of NGC 7055 table3.dat 69 288 Observed program stars of NGC 7127
Byte-by-byte Description of file: table1.dat table2.dat table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Stars number sorted after X and Y, within the cluster 5- 10 F6.2 pix Xpos X coordinate (scale 0.9"/pix) 12- 17 F6.2 pix Ypos Y coordinate (scale 0.9"/pix) 19- 24 F6.3 mag Bmag ?=- Johnson-Cousins B magnitude 26- 30 F5.3 mag e_Bmag ?=- Error in B magnitude 32- 37 F6.3 mag Vmag ?=- Johnson-Cousins V magnitude 39- 43 F5.3 mag e_Vmag ?=- Error in V magnitude 45- 50 F6.3 mag Rcmag ?=- Johnson-Cousins R magnitude 52- 56 F5.3 mag e_Rcmag ?=- Error in R magnitude 58- 63 F6.3 mag Icmag ?=- Johnson-Cousins I magnitude 65- 69 F5.3 mag e_Icmag ?=- Error in I magnitude
Acknowledgements: Ernst Paunzen, epaunzen(at)physics.muni.cz
(End) Patricia Vannier [CDS] 04-Jun-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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