J/A+A/579/A28 Abundances of 3 CEMP stars (Bonifacio+, 2015)
TOPoS: II. On the bimodality of carbon abundance in CEMP stars.
Implications on the early chemical evolution of galaxies.
Bonifacio P., Caffau E., Spite M., Limongi M., Chieffi A., Klessen R.S.,
Francois P., Molaro P., Ludwig H.-G., Zaggia S., Spite F., Plez B.,
Cayrel R., Christlieb N., Clark P.C., Glover S.C.O., Hammer F., Koch A.,
Monaco L., Sbordone L., Steffen M.
<Astron. Astrophys. 579, A28 (2015)>
=2015A&A...579A..28B 2015A&A...579A..28B
ADC_Keywords: Stars, population II ; Stars, metal-deficient ;
Equivalent widths ; Abundances
Keywords: stars: Population II - stars: abundances - stars: Population III -
Galaxy: abundances - Galaxy: formation - Galaxy: halo
Abstract:
In the course of the TOPoS (Turn Off Primordial Stars) survey, aimed
at discovering the lowest metallicity stars, we have found several
carbon-enhanced metal-poor (CEMP) stars. These stars are very common
among the stars of extremely low metallicity and provide important
clues to the star formation processes. We here present our analysis of
six CEMP stars.
We want to provide the most complete chemical inventory for these six
stars in order to constrain the nucleosynthesis processes responsible
for the abundance patterns.
Description:
We analyse both X-Shooter and UVES spectra acquired at the VLT. We
used a traditional abundance analysis based on OSMARCS 1D Local
Thermodynamic Equilibrium (LTE) model atmospheres and the
TURBOSPECTRUM line formation code.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 101 3 Coordinates and magnitudes from SDSS
table4.dat 72 99 Line-by-line abundances of SDSS J0212+0137,
SDSS J1137+2553, and SDSS J1245-0738
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Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SDSS]
6- 15 A10 --- Name Abbreviated star name (JHHMM+DDMM)
17- 18 I2 h RAh Right ascension (J2000)
20- 21 I2 min RAm Right ascension (J2000)
23- 27 F5.2 s RAs Right ascension (J2000)
29 A1 --- DE- Declination sign (J2000)
30- 31 I2 deg DEd Declination (J2000)
33- 34 I2 arcmin DEm Declination (J2000)
36- 40 F5.2 arcsec DEs Declination (J2000)
42- 46 F5.2 mag umag SDSS u magnitude
48- 52 F5.2 mag gmag SDSS g magnitude
54- 58 F5.2 mag rmag SDSS r magnitude
60- 64 F5.2 mag imag SDSS i magnitude
66- 70 F5.2 mag zmag SDSS z magnitude
72- 76 F5.3 mag E(B-V) Colour excess
78- 81 A4 --- --- [SDSS]
83-101 A19 --- SDSS SDSS full name (JHHMMSS.ss+DDMMSS.s)
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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- 6 A6 --- Ion Ion (element and ionization stage)
9- 16 F8.4 nm lambda [375/867] Wavelength λ
18- 21 F4.2 eV chi [0/9.2] Lower energy of the transition χ
23- 28 F6.3 [-] loggf [-3/0.5]? Logarithm of the product of the
oscillator strength of the transition and the
statistical weight of the lower level
29- 31 A3 --- n_loggf [hfs] hfs for hyper-fine line
33- 37 F5.2 pm EW1 ? Equivalent width of the line for SDSS J0212+0137
38 A1 --- n_Ab1 [s] 's' if derived from synthetic spectrum
40- 44 F5.2 --- Ab1 ? Abundance of the element [log(X/H)+12] for
SDSS J0212+0137
47- 51 F5.2 pm EW2 ? Equivalent width of the line for SDSS J1137+2553
52 A1 --- n_Ab2 [s] 's' if derived from synthetic spectrum
54- 58 F5.2 --- Ab2 ? Abundance of the element [log(X/H)+12] for
SDSS J1137+2553
60- 64 F5.2 pm EW3 ? Equivalent width of the line for SDSS J1245-0738
65 A1 --- n_Ab3 [s] 's' if derived from synthetic spectrum
68- 72 F5.2 --- Ab3 ? Abundance of the element [log(X/H)+12] for
SDSS J1245-0738
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Acknowledgements:
Piercarlo Bonifacio, Piercarlo.Bonifacio(at)obspm.fr
References:
Caffau et al., Paper I 2013A&A...560A..71C 2013A&A...560A..71C
(End) Patricia Vannier [CDS] 19-Jun-2015