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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table6.dat 83 1197 Derived properties of member stars in Carina
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
Bytes Format Units Label Explanations
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) 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.
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), Rutledge, Hesser & Stetson (1997, Cat. J/PASP/109/883).
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
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