J/A+A/509/A93 Carbon-enhanced metal-poor stars (Masseron+, 2010)
A holistic approach to carbon-enhanced metal-poor stars.
Masseron T., Johnson J.A., Plez B., Van Eck S., Primas F., Goriely S.,
Jorissen A.
<Astron. Astrophys., 509, A93 (2010)>
=2010A&A...509A..93M 2010A&A...509A..93M
ADC_Keywords: Stars, population II ; Stars, metal-deficient ; Abundances
Keywords: stars: abundances - stars: AGB and post-AGB - stars: population II
Abstract:
Carbon-enhanced metal-poor (CEMP) stars are known to have properties
that reflect the nucleosynthesis of the first low- and intermediate-
mass stars, because most have been polluted by a now-extinct AGB star.
By considering abundances in the various CEMP subclasses separately,
we try to derive parameters (such as metallicity, mass, temperature,
and neutron source) characterising AGB nucleosynthesis from the
specific signatures imprinted on the abundances, and separate them
from the impact of thermohaline mixing, first dredge-up, and dilution
associated with the mass transfer from the companion.
To place CEMP stars in a broader context, we collect abundances for
about 180 stars of various metallicities (from solar to [Fe/H]=-4),
luminosity classes (dwarfs and giants), and abundance patterns (e.g.
C-rich and poor, Ba-rich and poor), from both our own sample and the
literature.
Description:
We compiled abundances from analyses of high-resolution spectra
(R>40000) of CEMP stars (Tables 1 and 2), Ba stars, and non-C-enhanced
metal-poor stars (Tables 3 and 4). C-rich stars are defined as stars
with [C/Fe]>0.9. In this paper, all plots are compiled exclusively of
data from these tables, including our own data from Paper II (Masseron
et al., in prep.). All these data are renormalised by the Asplund
(2005ARA&A..43..481A 2005ARA&A..43..481A) solar abundances.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 106 149 Abundances of light elements in carbon-enhanced
metal-poor stars from literature
table2.dat 102 149 Abundances of neutron-capture elements in carbon
enhanced metal-poor stars from literature
table3.dat 106 76 Abundances of light elements in non-carbon-enhanced
metal-poor stars ([C/Fe]<0.9)
table4.dat 102 76 Abundances of neutron-capture elements in non-carbon
enhanced metal-poor stars ([C/Fe]<0.9)
refs.dat 100 51 References
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See also:
J/A+A/290/885 : Abundances of very metal-poor stars (Primas+, 1994)
J/A+A/300/751 : Metal-poor stars spectroscopy. II (Axer+, 1995)
J/A+A/314/191 : Atmospheric parameters in metal-poor stars I (Gratton+, 1996)
J/A+A/350/955 : Atmospheric parameters in metal-poor stars II (Gratton+, 1999)
J/A+A/356/238 : Atmospheric parameters in metal-poor stars III (Carretta+ 2000)
J/A+A/354/169 : Metal-poor field stars abundances (Gratton+, 2000)
J/A+A/440/321 : Chemical abundances in 43 metal-poor stars (Jonsell+, 2005)
J/A+A/449/127 : Chemical abundances of 32 mildly metal-poor stars (Zhang+ 2006)
Byte-by-byte Description of file: table[13].dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Type [Ba rI rII] Star type (G1)
5- 19 A15 --- Name Object name
21- 24 I4 K Teff Effective temperature
26- 30 F5.2 [cm/s2] logg Gravity surface
32- 36 F5.2 [Sun] [Fe/H] Metallicity, preferentially from FeI
38- 41 F4.2 [Sun] e_[Fe/H] ?=- rms uncertainty on [Fe/H]
43- 47 F5.2 [Sun] [C/Fe] ?=- Carbon abundances from preferencially
CH determination
49- 52 F4.2 [Sun] e_[C/Fe] ?=- rms uncertainty on [C/Fe]
54 A1 --- l_12C/13C Limit flag on 12C/13C
55- 56 I2 [Sun] 12C/13C ?=- 12C/13C carbon isotope ratio
58- 61 F4.1 [Sun] e_12C/13C ?=- rms uncertainty on 12C/13C
62 A1 --- n_12C/13C [us]
64- 68 F5.2 [Sun] [N/Fe] ?=- Nitrogen abundance preferentially from CN
70- 73 F4.2 [Sun] e_[N/Fe] ?=- rms uncertainty on [N/Fe]
75- 76 A2 --- n_[O/Fe] Measurements from OI triplet (OI) or
OH lines (OH)
78 A1 --- l_[O/Fe] Limit flag on [O/Fe]
79- 83 F5.2 [Sun] [O/Fe] ?=- Oxygen abundance (1)
85- 88 F4.2 [Sun] e_[O/Fe] ?=- rms uncertainty on [O/Fe]
90- 94 F5.2 [Sun] [O/Fe]n ?=- Non-LTE corrections of OI triplet
measurement according to Takeda et al.,
2003, Cat. J/A+A/402/343 (when applicable)
95 A1 --- n_[O/Fe]n [N] N for NaN
97-101 F5.2 [Sun] [Mg/Fe] ?=- Magnesium abundance
103-106 F4.2 [Sun] e_[Mg/Fe] ?=- rms uncertainty on [Mg/Fe]
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Note (1): By default, the oxygen measurement comes from the [OI] line at 630nm.
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Byte-by-byte Description of file: table[24].dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Type [Ba rI rII] Star type (G1)
5- 19 A15 --- Name Object name
21 A1 --- l_[Ba/Fe] Limit flag on [Ba/Fe]
22- 26 F5.2 [Sun] [Ba/Fe] ?=- Barium (Z=56) abundance
28- 31 F4.2 [Sun] e_[Ba/Fe] ?=- rms uncertainty on [Ba/Fe]
33 A1 --- l_[La/Fe] Limit flag on [La/Fe]
34- 38 F5.2 [Sun] [La/Fe] ?=- Lanthane (Z=57) abundances
40- 43 F4.2 [Sun] e_[La/Fe] ?=- rms uncertainty on [La/Fe]
45 A1 --- l_[Ce/Fe] Limit flag on [Ce/Fe]
46- 50 F5.2 [Sun] [Ce/Fe] ?=- Cerium (Z=58) abundance
52- 55 F4.2 [Sun] e_[Ce/Fe] ?=- rms uncertainty on [Ce/Fe]
57 A1 --- l_[Eu/Fe] Limit flag on [Eu/Fe]
58- 62 F5.2 [Sun] [Eu/Fe] ?=- Europium (Z=63) abundance
64- 67 F4.2 [Sun] e_[Eu/Fe] ?=- rms uncertainty on [Eu/Fe]
69 A1 --- l_[Pb/Fe] Limit flag on [Pb/Fe]
70- 74 F5.2 [Sun] [Pb/Fe] ?=- Lead (Z=82) abundance
76- 79 F4.2 [Sun] e_[Pb/Fe] ?=- rms uncertainty on [Pb/Fe]
81- 85 A5 --- Class Classification from Fig. (2)
87- 90 A4 --- rSun Solar abundances reference (1)
92-102 A11 --- Ref References, in refs.dat file
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Note (1): Solar abundances reference adopted in the original reference
source as follows::
An89 = Anders & Grevesse, 1989, Geochim. Cosmochim. Acta, 53, 197
Gr96 = Grevesse et al., 1996, SP Conf. Ser., 99, 117
Gr98 = Grevesse & Dauval, 1998, Space Sci. Rev., 85, 161
Gr20 = Grevesse et al., 2000, Solar Abundances
As05 = Asplund, 2005ARA&A..43..481A 2005ARA&A..43..481A
Note (2): classes adopted in the paper for C-enhanced stars, as follows:
r = [Ba/Eu]<0
rI = [Ba/Eu]<0 and [Eu/Fe]<1
rII = [Ba/Eu]<0 and [Eu/Fe]>1
s = [Ba/Eu]>0 and [Ba/Fe]>1
low-s = [Ba/Eu]>0 and [Ba/Fe]<1
rs = [Ba/Eu]>0 and [Eu/Fe]<1
no = [Ba/Fe]<1
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 40 A17 --- Aut Author's name
42-100 A59 --- Com Comments
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Global notes:
Note (G1): For non-Carbon enhanced stars, the type is as follows:
Ba = Ba star (metal-rich counterparts of CEMP-s stars)
rI = Metal-poor star with 0.3≤[Eu/Fe]≤+1.0 and [Ba/Eu]<0
rII = Metal-poor star with [Eu/Fe]>+1.0 and [Ba/Eu]<0
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Apr-2010