J/ApJ/705/328 Abundance measurements in Sculptor dSph (Kirby+, 2009)
Multi-element abundance measurements from medium-resolution spectra.
I. The Sculptor dwarf spheroidal galaxy.
Kirby E.N., Guhathakurta P., Bolte M., Sneden C., Geha M.C.
<Astrophys. J., 705, 328-346 (2009)>
=2009ApJ...705..328K 2009ApJ...705..328K
ADC_Keywords: Abundances, [Fe/H] ; Galaxies, nearby ; Photometry, CMT1T2V
Keywords: galaxies: abundances - galaxies: dwarf - galaxies: individual
(Sculptor dwarf) - Galaxy: evolution - Local Group
Abstract:
We present measurements of Fe, Mg, Si, Ca, and Ti abundances for 388
radial velocity member stars in the Sculptor dwarf spheroidal galaxy
(dSph), a satellite of the Milky Way (MW). This is the largest sample
of individual α element (Mg, Si, Ca, and Ti) abundance
measurements in any single dSph. The measurements are made from
Keck/Deep Imaging Multi-Object Spectrometer medium-resolution spectra
(6400-9000Å, R∼6500). Based on comparisons to published
high-resolution (R≳20000) spectroscopic measurements, our
measurements have uncertainties of α[Fe/H]=0.14 and
α[α/Fe]=0.13. We have discovered one star with
[Fe/H]=-3.80±0.28, which is the most metal-poor star known
anywhere except the MW halo, but high-resolution spectroscopy is
needed to measure this star's detailed abundances.
Description:
We selected targets from the Sculptor photometric catalog of Westfall
et al. (2006, Cat. J/AJ/131/375). DEIMOS observations were made in 2008
Aug 3,4,31 and Sep 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 116 388 Multi-element abundances in Sculptor
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See also:
J/ApJS/191/352 : Stars in Milky Way dwarf satellite galaxies (Kirby+, 2010)
J/ApJ/682/1217 : Abundances in red giants in 7 globular clusters (Kirby+,
2008)
J/AJ/131/375 : Exploring halo substructures. VIII. (Westfall+, 2006)
J/MNRAS/363/734 : Sculptor dSph variables metal abundances (Clementini+, 2005)
J/AJ/130/1065 : Members of the Sculptor dwarf spheroidal galaxy (Coleman+,
2005)
J/AJ/110/2747 : Stars in Sculptor dwarf spheroidal galaxy (Schweitzer+ 1995)
Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Hour of Right Ascension (J2000)
4- 5 I2 min RAm Minute of Right Ascension (J2000)
7- 10 F4.1 s RAs Second of Right Ascension (J2000)
12 A1 --- DE- Sign of the Declination (J2000)
13- 14 I2 deg DEd Degree of Declination (J2000)
16- 17 I2 arcmin DEm Arcminute of Declination (J2000)
19- 20 I2 arcsec DEs Arcsecond of Declination (J2000)
22- 27 F6.3 mag Mmag Washington M band magnitude
29- 33 F5.3 mag e_Mmag Uncertainty in Mmag
35- 40 F6.3 mag T2mag Washington T2 band magnitude
42- 46 F5.3 mag e_T2mag Uncertainty in T2mag
48- 51 I4 K Teff Effective temperature
53- 56 F4.2 [cm/s2] logg Log of surface gravity
58- 61 F4.2 km/s vt Microturbulent velocity
63- 67 F5.2 [Sun] [Fe/H] Iron abundance relative to the Sun
69- 72 F4.2 [Sun] e_[Fe/H] Uncertainty in [Fe/H]
74- 78 F5.2 [Sun] [Mg/Fe] ? Magnesium-to-iron ratio relative to the Sun
80- 83 F4.2 [Sun] e_[Mg/Fe] ? Uncertainty in [Mg/Fe]
85- 89 F5.2 [Sun] [Si/Fe] ? Silicon-to-iron ratio relative to the Sun
91- 94 F4.2 [Sun] e_[Si/Fe] ? Uncertainty in [Si/Fe]
96-100 F5.2 [Sun] [Ca/Fe] ? Calcium-to-iron ratio relative to the Sun
102-105 F4.2 [Sun] e_[Ca/Fe] ? Uncertainty in [Ca/Fe]
107-111 F5.2 [Sun] [Ti/Fe] ? Titanium-to-iron ratio relative to the Sun
113-116 F4.2 [Sun] e_[Ti/Fe] ? Uncertainty in [Ti/Fe]
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Nomenclature notes:
Stars are <[KGB2009] JHHMMSS.s+DDMMSS> in Simbad.
History:
From electronic version of the journal
References:
Kirby et al. Paper II. 2010ApJS..191..352K 2010ApJS..191..352K Cat J/ApJS/191/352
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 18-Jan-2011