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J/AJ/112/1054         VI photometry of NGC 6426 (Zinn+ 1996)

The horizontal branches of globular clusters. I. The color-magnitude diagram of NGC 6426 Zinn R., Barnes S. <Astron. J. 112, 1054 (1996)> =1996AJ....112.1054Z
ADC_Keywords: Stars, horizontal branch ; Clusters, globular ; Photometry Abstract: A color-magnitude diagram of the globular cluster NGC 6426 has been constructed from photometry in the V and I passbands. The cluster has the steep giant branch indicative of a very metal-poor composition. Following the technique of Sarajedini (1994AJ....107..618S), we derive [Fe/H]=-2.31±0.10 and E(V-I)=0.54±0.03 [E(B-V)=0.40±0.02] from a comparison with the giant branches of other globular clusters. These values are very close to the ones obtained from photometry of the cluster's integrated light, and the weighted means of our results and the previous ones are [Fe/H]=-2.28±0.09 and E(B-V)=0.41±0.02. The mean V magnitude of the horizontal branch (HB) at the instability strip is 18.12±0.05, from which we estimate that NGC 6426 lies 17.4kpc from the Sun, 11.5kpc from the galactic center, and 4.9kpc from the galactic plane. NGC 6426 resembles NGC 5466 and M68 in both [Fe/H] and HB morphology. The HB of NGC 6426 overlaps the one in M15 from the red HB to M15's gap in the blue HB, but there is no evidence of significant numbers of faint blue HB stars in NGC 6426 that are analogous to the ones constituting the "extended HB" in M15. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 17 44.9 +03 11 NGC 6426 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 50 1807 Photometry of NGC 6426
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Star Star number in cluster 6- 13 F8.3 pix Xpos X coordinate on the master frame (1) 15- 22 F8.3 pix Ypos Y coordinate on the master frame (1) 24- 29 F6.3 mag Vmag V magnitude 32- 36 F5.3 mag e_Vmag Error in V as given by DAOPHOT 39- 43 F5.3 mag V-I V-I color index 46- 50 F5.3 mag e_V-I Error in V-I as given by DAOPHOT
Note (1): The origin of the pixel numbers is at lower left corner. North is at the left, and east is at the bottom.
Origin: AAS CD-ROM series, Volume 7, 1996 Lee Brotzman [ADS] 25-Sep-1996
(End) [CDS] 30-Jan-1997
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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