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J/A+A/240/262     UBVR photometry of the open cluster King 2    (Aparicio+ 1990)

CCD UBVR photometry of the old rich open cluster King 2: comparison with theoretical models. Aparicio A., Bertelli G., Chiosi C., Garcia-Pelayo J.M. <Astron. Astrophys. 240, 262 (1990)> =1990A&A...240..262A
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI Keywords: clusters: open - stars: H-R diagrams - stars: structure Abstract: In this paper we present the Johnson-Cousins UBVR CCD photometry of the stars in King 2, an old open cluster towards the galactic anticenter. We have obtained the colour-magnitude diagram, the colour excess, the reddening, an estimate of the metallicity, and the distance modulus. The comparison of the observational colour-magnitude diagram with the theoretical simulations based on stellar models with convective overshoot shows that a major revision of the model structure is required. To this aim, we explore the possibility that the formulation of convective overshoot for stars in the mass range 1 to 2M ought to be different from the one currently in use. The point of major uncertainty that we see to affect the stars in this domain is whether or not convective overshoot may erode the gradient in molecular weight in the regions surrounding the convective core. We find that models, in which this is not allowed to occur, better fit the overall morphology of the colour-magnitude diagram of King 2. In addition to this, analyzing the width of the main sequence band we suggest that a significant fraction of the stars are members of binary systems, and evaluate the range spanned by their mass ratios. Finally, we derive the luminosity function and the mass function for the main sequence stars of the cluster. Objects: -------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------- 00 51 00.0 +58 11 00 Cl King 2 = C 0048+579 -------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 61 748 Photometric data of King 2
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ABC Sequential number, Cl* King 2 ABC NNN in Simbad 5- 10 F6.2 pix Xpos X position (1) 12- 18 F7.2 pix Ypos Y position (1) 20- 24 F5.2 mag Vmag Johnson V magnitude 26- 29 F4.2 mag e_Vmag rms uncertainty on Vmag 31- 35 F5.2 mag U-B ?=- Johnson U-B colour index 37- 40 F4.2 mag e_U-B ?=- rms uncertainty on U-B 42- 45 F4.2 mag B-V ?=- Johnson B-V colour index 47- 50 F4.2 mag e_B-V ?=- rms uncertainty on B-V 52- 56 F5.2 mag V-Rc ?=- Johnson-Cousins V-R colour index 58- 61 F4.2 mag e_V-Rc ?=- rms uncertainty on V-Rc
Note (1): North at the left and east at the bottom. 1pix=15µm=0.254".
History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 27-Jun-2003
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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