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J/AJ/109/1086      VI Photometry in M54 and Sgr Dwarf Galaxy  (Sarajedini+ 1995)

A Photometric Study of the Globular Cluster M54 and the Sagittarius Dwarf Galaxy: Evidence for Three Distinct Populations Sarajedini A., Layden A.C. <Astron. J. 109, 1086 (1995)> =1995AJ....109.1086S
ADC_Keywords: Photometry, CCD ; Clusters, globular Abstract: We present VI CCD color-magnitude diagrams for the globular cluster M54 and the Sagittarius dwarf galaxy. These are used to derive the following quantities: [Fe/H] = -1.79 ± 0.08 for M54 and [Fe/H] = -0.52 ± 0.09 for Sagittarius. We find a metallicity dispersion of ± 0.16 dex in M54, and we infer the possible existence of a [Fe/H] ∼ -1.3 component in Sagittarius, which may have a metallicity dispersion as well. The mean reddening in the direction of M54 is E(B-V) = 0.13 ± 0.02. The distances to M54 and Sagittarius, determined using their horizontal branch magnitudes, are identical to within the uncertainties of existing RR Lyrae luminosity-abundance relations. This, together with positional and radial velocity arguments, suggests that M54 is physically associated with Sagittarius. We note that M54 is substantially brighter than the globular cluster members of the Fornax dwarf spheroidal galaxy, and that the metal abundance of Sagittarius is quite high for its estimated absolute magnitude. Objects: ----------------------------------------------- RA (2000) DE Designation(s) ----------------------------------------------- 18 55.1 -30 28 M 54 = NGC 6715 = C 1851-305 19 30.0 -17 41 ESO 594- 4 = Sgr Dwarf Galaxy ----------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 63 3214 CCD photometry for M54. table2.dat 63 1638 CCD photometry for Sgr.
See also: J/AJ/119/1760 : M54 and Sgr dSph VI photometry (Layden+, 2000) Byte-by-byte Description of file: table1.dat table2.dat
Bytes Format Units Label Explanations
1- 6 I6 --- Star Star number 7- 15 F9.2 pix Xpos X pixel position 16- 24 F9.2 pix Ypos Y pixel position 25- 33 F9.2 mag Vmag V magnitude 34- 42 F9.3 mag e_Vmag V magnitude error 43- 51 F9.2 mag V-I V-I color 52- 60 F9.3 mag e_V-I V-I color error 61- 63 I3 --- Det Number of detections
Origin: AAS CD-ROM series, Volume 5, 1995 Lee Brotzman [ADS] 17-Jul-1995
(End) [CDS] 09-Jan-1996
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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