J/AJ/131/895 Stars in the Carina dwarf spheroidal galaxy (Koch+, 2006)
Complexity on small scales: the metallicity distribution of the Carina dwarf
spheroidal galaxy.
Koch A., Grebel E.K., Wyse R.F.G., Kleyna J.T., Wilkinson M.I.,
Harbeck D.R., Gilmore G.F., Evans N.W.
<Astron. J., 131, 895-911 (2006)>
=2006AJ....131..895K 2006AJ....131..895K
ADC_Keywords: Abundances, [Fe/H] ; Galaxies, nearby
Keywords: abundances - galaxies: dwarf - galaxies: evolution -
galaxies: individual (Carina) - galaxies: stellar content -
galaxies: structure - Local Group
Abstract:
The Carina dwarf spheroidal galaxy is the only galaxy of this type
that shows clearly episodic star formation separated by long pauses.
Here we present metallicities for 437 radial velocity members of this
Galactic satellite. The metallicities and radial velocities were
measured as part of a Large Programme with the Very Large Telescope
at the European Southern Observatory, Chile. We obtained
medium-resolution spectroscopy with the multiobject spectrograph
FLAMES. Our target red giants cover the entire projected surface area
of Carina. Our spectra are centered at the near-infrared CaII triplet,
which is a well-established metallicity indicator for old and
intermediate-age red giants. The resulting data sample provides the
largest collection of spectroscopically derived metallicities for a
Local Group dwarf spheroidal galaxy to date.
Description:
Our observations were performed in visitor mode with the FLAMES (Fibre
Large Array Multi Element Spectrograph) facility at the Very Large
Telescope (VLT) UT2 of the European Southern Observatory on Cerro
Paranal in Chile. We observed during 22 nights spread over two
semesters in 2003 and 2004.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 83 1197 Derived properties of member stars in Carina
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See also:
J/AJ/114/1458 : The Carina Dwarf (Mighell 1997)
J/AJ/130/2677 : Stars in the Carina dSph galaxy field (Majewski+, 2005)
J/PASP/109/883 : Globular metallicity scale. I. (Rutledge+ 1997)
J/A+AS/121/95 : Atmospheric parameters for 24 clusters (Carreta+ 1997)
Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- [KGW2006] Star designation (1)
14 I1 h RAh Hour of Right Ascension (J2000)
16- 17 I2 min RAm Minute of Right Ascension (J2000)
19- 23 F5.2 s RAs Second of Right Ascension (J2000)
25 A1 --- DE- Sign of the Declination (J2000)
26- 27 I2 deg DEd Degree of Declination (J2000)
29- 30 I2 arcmin DEm Arcminute of Declination (J2000)
32- 36 F5.2 arcsec DEs Arcsecond of Declination (J2000)
38- 41 F4.1 arcmin Rad Elliptical radius
43- 47 F5.2 mag Vmag The V band magnitude
49- 52 F4.2 mag B-V The (B-V) color index
54- 58 F5.2 0.1nm W(Ca) ? Ca triplet line strength in Angstroms (2)
60- 64 F5.2 [Sun] Fe/H(ZW) ? [Fe/H] metallicity on the
Zinn & West (1984ApJS...55...45Z 1984ApJS...55...45Z) scale (3)
66- 70 F5.2 [Sun] Fe/H(CG) ? The [Fe/H] metallicity on the Carretta &
Gratton (1984, Cat. J/A+AS/121/95) scale (3)
72- 75 F4.2 [Sun] e_Fe/H ? Uncertainty in the [Fe/H] metallicity
77- 83 F7.2 [-] logPr Log of the membership probability.
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Note (1): The nomenclature is such that LG04a-d designates the EIS-fields
targeting Carina (EIS-team, priv. comm.) followed by the number in the
respective input catalog.
Note (2): The Ca line strength is defined as ΣW=EW8542+EW8662.
Note (3): Based on calibrations to the comprehensive catalog of CaT data
from Rutledge et al. (1997PASP..109..907R 1997PASP..109..907R), Rutledge, Hesser & Stetson
(1997, Cat. J/PASP/109/883).
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History:
* 04-Apr-2007: From electronic version of the journal
* 03-Apr-2009: More precise positions (from author)
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 15-Jan-2007