J/A+A/550/A7 HST photometry of Sculptor group dwarf galaxies (Lianou+, 2013)
Population gradients and photometric metallicities in early- and transition-type
dwarf galaxies: clues from the Sculptor group.
Lianou S., Grebel E.K., Da Costa G.S., Rejkuba M., Jerjen H., Koch A.
<Astron. Astrophys., 550, A7 (2013)>
=2013A&A...550A...7L 2013A&A...550A...7L
ADC_Keywords: Galaxies, photometry ; Photometry, HST
Keywords: galaxies: dwarf - galaxies: evolution - galaxies: stellar content -
galaxies: groups: individual: Sculptor group
Abstract:
We focus on the resolved stellar populations of one early-type and
four transition-type dwarf galaxies in the Sculptor group, with the
aim to examine the potential presence of population gradients and
place constraints on their mean metallicities.
We use deep Hubble Space Telescope images to construct
color-magnitude diagrams, from which we select stellar populations
that trace different evolutionary phases in order to constrain their
range of ages and metallicities, as well as to examine their spatial
distribution. In addition, we use the resolved stars in the red giant
branch in order to derive photometric metallicities.
Description:
Position and photometry for the resolved stars of five dwarf galaxies
in the Sculptor Group. The dwarf galaxies are: ESO540-G030;
ESO540-G032; ESO294-G010; ESO410-G005; SCL-DE1. The catalogue includes
only those stars in which all selection criteria described in the
companion paper were applied.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 60 5 Log of observations
e540_030.dat 57 13439 Position and photometry of stars in ESO540-G030
e540_032.dat 57 16504 Position and photometry of stars in ESO540-G032
e294_010.dat 57 27605 Position and photometry of stars in ESO294-G010
e410_005.dat 57 34284 Position and photometry of stars in ESO410-G005
scl_de1.dat 57 8310 Position and photometry of stars in SCL-DE1
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See also:
J/A+A/549/A47 : Position and photometry of stars in SDIG (Lianou+, 2013)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Galaxy name
13- 14 I2 h RAh Right Ascension J2000
16- 17 I2 min RAm Right Ascension J2000
19- 23 F5.2 s RAs Right Ascension J2000
25 A1 --- DE- Declination sign J2000
26- 27 I2 deg DEd Declination J2000
29- 30 I2 arcmin DEm Declination J2000
32- 35 F4.1 arcsec DEs Declination J2000
37- 41 I5 s Exp606W Exposure time in F606W filter
43- 47 I5 s Exp814W Exposure time in F814W filter
49- 60 A12 --- FileName Name of the file with photometry
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Byte-by-byte Description of file: e*.dat s*.dat
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Bytes Format Units Label Explanations
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1- 8 F8.5 deg RAdeg Right Ascension J2000 (degrees)
10- 17 F8.4 deg DEdeg Declination J2000 (degrees)
19- 24 F6.3 mag F606W F606W magnitude (ACS filter system)
26- 31 F6.3 mag Vmag V magnitude (Johnson)
33- 37 F5.3 mag e_F606W F606W magnitude error (1)
39- 44 F6.3 mag F814W F814W magnitude (ACS filter system)
46- 51 F6.3 mag Imag I magnitude (Cousins)
53- 57 F5.3 mag e_F814W F814W magnitude error (1)
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Note (1): The photometric uncertainties are derived using the artificial
star tests.
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Acknowledgements:
Sophia Lianou, sophia.thl(at)gmail.com
(End) Sophia Lianou [IAASARS-NOA], Patricia Vannier [CDS] 13-May-2013