J/A+A/606/A71 dSph RGB abundance and velocities (Skuladottir+, 2017)
Zinc abundances in the Sculptor dwarf spheroidal galaxy.
Skuladottir A., Tolstoy, E. Salvadori S., Hill V., Pettini M.
<Astron. Astrophys. 606, A71 (2017)>
=2017A&A...606A..71S 2017A&A...606A..71S (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Stars, giant ; Abundances
Keywords: stars: abundances - galaxies: abundances - galaxies: dwarf -
galaxies: evolution - galaxies: Local Group
Abstract:
From ESO VLT/FLAMES/GIRAFFE spectra, abundance measurements of Zn have
been made in ∼100 individual red giant branch (RGB) stars in the
Sculptor dwarf spheroidal galaxy. This is the largest sample of
individual Zn abundance measurements within a stellar system beyond
the Milky Way. In the observed metallicity range, -2.7≤[Fe/H]≤-0.9,
the general trend of Zn abundances in Sculptor is similar to that of
α-elements. That is, super-solar abundance ratios of [Zn/Fe] at
low metallicities, which decrease with increasing [Fe/H], eventually
reaching subsolar values. However, at the higher metallicities in
Sculptor, [Fe/H]≳-1.8, we find a significant scatter,
-0.8≲[Zn/Fe]≲+0.4, which is not seen in any α-element. Our
results are consistent with previous observations of a limited number
of stars in Sculptor and in other dwarf galaxies. These results
suggest that zinc has a complex nucleosynthetic origin, behaving
neither completely like an α- nor an iron-peak element.
Description:
Stellar parameters, abundances with errors and S/N of the stellar
sample. Velocity measurements for a subset of the sample over long
period. Atomic linelist.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 61 101 Stellar parameters, abundances and S/N
(corrected version, 02-Oct-2019)
table3.dat 45 87 Velocity measurements
table4.dat 28 135 Linelist
xtargets.dat 31 19 Positions for sources not in Skuladottir et al.,
2015, Cat J/A+A/574/A129
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See also:
J/MNRAS/383/183 : CaII triplet of RGB from VLT/FLAMES obs. (Battaglia+, 2008)
J/A+A/574/A129 : The First CEMP star in the Sculptor dSph (Skuladottir+, 2015)
J/A+A/580/A129 : Sulphur in the Sculptor dSph (Skuladottir+, 2015)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Star Star name (ETNNNN, [STS2015] ETNNNN in Simbad)
8- 12 F5.2 [-] [Fe/H] Iron abundance
14- 17 F4.2 [-] e_[Fe/H] Error on [Fe/H]
19- 20 I2 pix-1 S/Nblue Signal-to-noise ration for 4750-4850Å
22- 23 I2 pix-1 S/Nred Signal-to-noise ration for 4850=4950Å
25- 26 I2 --- nTi ?=- Number of Ti lines
28- 31 F4.2 [-] e_noise(Ti) ?=- Error on [Ti/H]
33- 37 F5.2 [-] [Ti/Fe] ?=- Abundance ratio of Ti over Fe
39- 42 F4.2 [-] e_[Ti/Fe] ?=- Error on [Ti/H]
44 I1 [-] nZn ?=- Number of Zn lines
46- 49 F4.2 --- e_noise(Zn) ?=- Error on [Zn/H]
51 A1 --- l_[Zn/Fe] Upper limit flag for [Zn/Fe]
52- 56 F5.2 [-] [Zn/Fe] ?=- Abundance ratio of Zn over Fe
58- 61 F4.2 [-] e_[Zn/Fe] ?=- Error on [Zn/Fe]
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Star Star name (ETNNNN, [STS2015] ETNNNN in Simbad)
8- 12 F5.1 km/s RV1 ?=- Velocity measurements in 2003 (1)
14- 18 F5.1 km/s RV2 ?=- Velocity measurements in 2004 (2)
20- 24 F5.1 km/s RV3 ?=- Velocity measurements in 2012 (3)
26- 30 F5.1 km/s RV4 ?=- Velocity measurements in 2013 (4)
32- 36 F5.1 km/s RV5 ?=- Velocity measurement in 2013 (1 star) (5)
38- 45 A8 --- Binary Comment if a star is a possible/likely binary
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Note (1): Hill et al. in prep.
Note (2): Battaglia et al., 2008, Cat. J/MNRAS/383/183
Note (3): Skuladottir et al., 2015a, Cat. J/A+A/580/A129
Note (4): This work
Note (5): Skuladottir et al. 2015b, Cat. J/A+A/574/129
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- El Element species
8- 15 F8.3 0.1nm lambda Wavelength
17- 21 F5.3 eV Chiex Excitation potential
23- 28 F6.3 [-] log(gf) Oscillator strength
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Byte-by-byte Description of file: xtargets.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Star Star name (ETNNNN, [STS2015] ETNNNN in Simbad)
8- 9 I2 h RAh Right ascension (J2000)
11- 12 I2 min RAm Right ascension (J2000)
14- 18 F5.2 s RAs Right ascension (J2000)
20 A1 --- DE- Declination sign (J2000)
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 31 F5.2 arcsec DEs Declination (J2000)
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Acknowledgements:
Asa Skuladottir, skuladottir(at)mpia.de
History:
* 12-Oct-2017: on-line version
* 02-Oct-2019: table2 corrected (from author)
(End) Asa Skuladottir [MPIA, Heidelberg], Patricia Vannier [CDS] 02-Aug-2017