Access to Astronomical Catalogues

← Click to display the menu
J/ApJ/483/826             BVI CCD photometry of Berkeley 17 (Phelps 1997)

Berkeley 17: the oldest open cluster? Phelps R.L. <Astrophys. J. 483, 826 (1997)> =1997ApJ...483..826P
ADC_Keywords: Clusters, open ; Photometry, CCD Keywords: Hertzsprung-Russell diagram - open clusters and associations: individual (Berkeley 17) - stars: abundances - stars: evolution Abstract: Faint magnitude BVI CCD photometry of the central region of the old open cluster Berkeley 17 (Be 17) has been undertaken to investigate the claim that it is the oldest open cluster yet discovered (Phelps, Janes, & Montgomery, 1994AJ....107.1079P). This study reveals Be 17 to have a metallicity -0.30≤[Fe/H]≤0.00; a reddening 0.52≤E(B-V)≤0.68 or 0.61≤E(V-I)≤0.71; a distance modulus, (m-M)0=12.15±0.10, corresponding to a distance of 2.7±0.1kpc; a diameter of ∼10pc; a minimum mass of 400 Msun; and an age of 10-13Gyr. With an adopted age of 12(+1)(-2)Gyr, these results suggest that Be 17 is indeed the oldest open cluster yet discovered. The inferred old age for Be 17 indicates that the cluster is an important one for studies of the differences between open and globular clusters, the transition from the halo/thick disk to the thin disk of the Galaxy, and even for establishing the minimum age of the universe. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 05 20.6 +30 36 Cl Berkeley 17 = C 0517+305 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file fig1a.dat 51 619 V, B-V color-magnitude diagram data for Be 17 fig1b.dat 51 797 V, V-I color-magnitude diagram data for Be 17 fig2.dat 51 448 V, V-I color magnitude diagram data for the Be 17 off-cluster control field
Byte-by-byte Description of file: fig1a.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ID Identification number 6- 12 F7.2 pix Xpos X coordinate (1) 15- 21 F7.2 pix Ypos Y coordinate (1) 24- 29 F6.3 mag Vmag V magnitude 32- 37 F6.3 mag B-V B-V color 40- 44 F5.3 mag e_Vmag Error in Vmag 47- 51 F5.3 mag e_B-V Error in B-V
Note (1): 1 pix = 0.30".
Byte-by-byte Description of file: fig1b.dat fig2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ID Identification number 6- 12 F7.2 pix Xpos X coordinate (1) 15- 21 F7.2 pix Ypos Y coordinate (1) 24- 29 F6.3 mag Vmag V magnitude 32- 37 F6.3 mag V-I V-I color 40- 44 F5.3 mag e_Vmag Error in Vmag 47- 51 F5.3 mag e_V-I Error in V-I
Note (1): 1 pix = 0.30".
Origin: AAS CD-ROM series, Volume 9, 1997 Lee E. Brotzman [ADS] 24-Jul-97
(End) [CDS] 05-Feb-1998
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

catalogue service

© UDS/CNRS

Contact