J/A+A/330/453 Sagittarius Dwarf Galaxy VI photometry (Marconi+, 1998)
The stellar content of the Sagittarius Dwarf Galaxy.
Marconi G., Buonanno R., Castellani M., Iannicola G., Molaro P.,
Pasquini L., Pulone L.
<Astron. Astrophys. 330, 453 (1998)>
=1998A&A...330..453M 1998A&A...330..453M
ADC_Keywords: Galaxies, photometry ; Photometry, CCD
Keywords: techniques: photometry - stars: HR-diagrams -
stars: luminosity function - galaxies: irregular -
galaxies: stellar content
Abstract:
We present V,I deep CCD photometry for three fields of the dwarf
galaxy in Sagittarius (Sgr), located at l=5.6°, b=-14.1°. One
of the fields is centered on the globular cluster NGC 6715 (M54),
which lies in one of the dense clumps of the Sgr galaxy. Comparing the
CMD of Sgr with those of globular clusters which are believed to be
kinematically associated with the dwarf galaxy (Da Costa & Armandroff,
1995AJ....109.2533D 1995AJ....109.2533D), we conclude that the stellar population of Sgr
presents a spread in metallicity of -0.71≤[Fe/H]≤-1.58, and that the
dominant population (≃10Gyr old) is extremely similar to the star
content of the associated globular cluster Terzan 7. The estimated
distance to Sgr is d≃24.55Kpc.
Objects:
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RA (2000) DE Designation(s)
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18 55 03.3 -30 28 43 M 54 = NGC 6715
18 53 44 -30 28 23 Sagittarius Dwarf Galaxy (field 1)
18 59 44 -30 59 45 Sagittarius Dwarf Galaxy (field 2)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
m54.dat 32 7928 M54 data (Fig. 4a of the paper)
sagit1.dat 32 9154 Sagittarius field 1 data (Fig. 2 of the paper)
sagit2.dat 32 6975 Sagittarius field 2 data (Fig. 3 of the paper)
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See also:
J/A+A/310/715 : Tucana dwarf galaxy VI photometry (Castellani+, 1996)
J/AJ/118/1671 : Fornax cluster 4 VI photometry (Buonanno+, 1999)
Byte-by-byte Description of file: *.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Star identification number
6- 12 F7.2 pix Xpos X position of the star (arbitrary origin) (1)
14- 20 F7.2 pix Ypos Y position (1)
22- 26 F5.2 mag Vmag V magnitude
28- 32 F5.2 mag V-I V-I color index
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Note (1): Centers are (J2000):
m54.dat: 18 55 03 -30 28 42
sagit1.dat: 18 53 44 -30 28 23
sagit2.dat: 18 59 44 -30 59 45
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Acknowledgements: Marco Castellani
(End) Patricia Bauer [CDS] 07-Nov-2000