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J/A+A/381/65        BVI photometry of NGC 2099               (Nilakshi+, 2002)

A comprehensive study of the rich open star cluster NGC 2099 based on deep BVI CCD observations Nilakshi N., Sagar R. <Astron. Astrophys. 381, 65 (2002)> =2002A&A...381...65N
ADC_Keywords: Clusters, open ; Photometry, CCD Keywords: open clusters and associations: individual: NGC 2099 - stars: HR diagram - evolution - formation Abstract: The CCD observations of the rich open star cluster NGC 2099 and its surrounding field region have been carried out up to a limiting magnitude of V∼22mag in B, V and I passbands for the first time. A total of ∼12000 stars have been observed in the area of about 24'x24' in the cluster region, as well as ∼2180 stars in the ∼ 12'x12' area of the field region located ∼45' away from the cluster center. The cluster parameters determined by fitting the convective core overshoot isochrones in the V, (B-V) and V, (V-I) diagrams are E(B-V)=0.30±0.40mag, distance=1360±100pc, age=400Myr and metallicity Z=0.008. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 05 52 17.6 +32 32 40 NGC 2099 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 74 14103 Relative positions and BVI magnitudes in NGC 2099
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1 A1 --- Region [CF] Cluster (C) or Field (F) region 3- 8 I6 --- Star Sequential star number 12- 18 F7.2 pix Xpos X position (1) 21- 27 F7.2 pix Ypos Y position (1) 30- 34 F5.2 mag Vmag V magnitude 37- 41 F5.2 mag B-V ? B-V colour index 44- 48 F5.2 mag V-I ? V-I colour index 52- 55 F4.2 mag e_Imag ? DAOPHOT error in I passband 59- 62 F4.2 mag e_Vmag DAOPHOT error in V passband 66- 69 F4.2 mag e_Bmag ? DAOPHOT error in B passband 73- 74 A2 --- Memb Membership proper motion (KM) and photometric (PM) membership
Note (1): The X and Y coordinates are accurate up to 0.5 pixel. The coordinates of the cluster center are RA = 05h 52m 17.6s, DE = +32° 32' 40" X values increase towards West while Y values increase towards south. One pixel along X and Y corresponds to 0.74 arcsec. Entire field corresponds to about 24 arcmin along X-axis and about 34 arcmin along Y axis.
Acknowledgements: Ram Sagar
(End) Patricia Bauer [CDS] 23-Nov-2001
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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