J/A+A/310/715 Tucana dwarf galaxy VI photometry (Castellani+, 1996)
The Tucana dwarf Galaxy.
Castellani M., Marconi G., Buonanno R.
<Astron. Astrophys. 310, 715 (1996)>
=1996A&A...310..715C 1996A&A...310..715C
ADC_Keywords: Galaxies, photometry ; Photometry, CCD
Keywords: stars: HR-diagrams - stars: luminosity functions -
galaxies: elliptical - galaxies: stellar content -
galaxies: Tucana dwarf
Abstract:
We present deep CCD photometry for the dwarf galaxy in Tucana
(l=323, b=-47.4). The data indicate that the galaxy is dominated by an
intermediate/old stellar population with metallicity similar to that
of the galactic globular clusters NGC 6752 and NGC 7089 (M2) (we find
[Fe/H]≃-1.56). The distance modulus we derived,
(m-M)V≃24.72±0.2, makes clear that this galaxy belongs to the
Local Gro up. Tucana is clearly different from other dwarf galaxies,
such as Leo I (Lee et al., 1993AJ....106.1420L 1993AJ....106.1420L), or Phoenix (Ortolani
and Gratton, 1988PASP..100.1405O 1988PASP..100.1405O), because there is no evidence of a
young stellar population (t≤5Gyrs) We suggest that the Tucana Galaxy
is a genuine dwarf spheroidal in which no recent burst of star
formation occurred.
Objects:
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RA (2000) DE Designation(s)
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22 41 49.7 -64 25 10 Tucana dwarf galaxy
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tucana.dat 34 940 Tucana VI photometry
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See also:
J/A+A/330/453 : Sagittarius Dwarf Galaxy VI photometry (Marconi+, 1998)
J/AJ/118/1671 : Fornax cluster 4 VI photometry (Buonanno+, 1999)
Byte-by-byte Description of file: tucana.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/940] A progressive number
5- 11 F7.2 pix Xpos X coordinate in the frame (1)
13- 19 F7.2 pix Ypos Y coordinate in the frame (1)
21- 27 F7.4 mag Vmag magnitude in the V band
29- 34 F6.4 mag V-I (V-I) color index
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Note (1): Field centered on RA = 22 38 27.9, DE = -64 40 53 (B1950)
1 pix = 0.12"
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History:
Copied from http://www.mporzio.astro.it/~mkast/data.html
Acknowledgements: Marco Castellani
(End) Patricia Bauer [CDS] 07-Nov-2000