J/A+A/622/L4 Carbon and oxygen in metal-poor halo stars (Amarsi+, 2019)
Carbon and oxygen in metal-poor halo stars.
Amarsi A.M., Nissen P.E., Asplund M., Lind K., Barklem P.S.
<Astron. Astrophys. 622, L4 (2019)>
=2019A&A...622L...4A 2019A&A...622L...4A (SIMBAD/NED BibCode)
ADC_Keywords: Stars, late-type ; Stars, metal-deficient ; Abundances ;
Equivalent widths
Keywords: radiative transfer - stars: abundances - stars: late-type -
stars: population II
Abstract:
Carbon and oxygen are key tracers of the Galactic chemical evolution;
in particular, a reported upturn in [C/O] towards decreasing [O/H] in
metal-poor halo stars could be a signature of nucleosynthesis by
massive Population III stars. We reanalyse carbon, oxygen, and iron
abundances in 39 metal-poor turn-off stars. For the first time, we
take into account 3D hydrodynamic effects together with departures
from local thermodynamic equilibrium (LTE) when determining both the
stellar parameters and the elemental abundances, by deriving effective
temperatures from 3D non-LTE Hβ profiles, surface gravities from
Gaia parallaxes, iron abundances from 3D LTE FeII equivalent widths,
and carbon and oxygen abundances from 3D non-LTE CI and OI equivalent
widths. We find that [C/Fe] stays flat with [Fe/H], whereas [O/Fe]
increases linearly up to 0.75dex with decreasing [Fe/H] down to
-3.0dex. Therefore [C/O] monotonically decreases towards decreasing
[C/H], in contrast to previous findings, mainly because the non-LTE
effects for OI at low [Fe/H] are weaker with our improved
calculations.
Description:
table1.dat contains stellar parameters and abundances.
table2.dat contains line-by-line equivalent widths and abundances for
The FeII lines used in this work.
table3.dat contains line-by-line equivalent widths and abundances for
the CI lines used in this work.
table4.dat contains line-by-line equivalent widths and abundances for
the OI lines used in this work.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 87 40 Stellar parameters/abundances
table2.dat 458 40 Line-by-line FeII widths/abundances
table3.dat 255 40 Line-by-line CI widths/abundances
table4.dat 115 40 Line-by-line OI widths/abundances
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See also:
J/A+A/425/671 : Equivalent widths of 10 metal-poor halo stars (Bai+, 2004)
J/ApJ/658/367 : Abundances of carbon stars in Galactic halo (Komiya+, 2007)
J/ApJ/711/573 : Detailed abundances in a halo stellar stream (Roederer+, 2010)
J/ApJ/762/26 : Most metal-poor stars. II. 190 Galactic halo stars (Yong+ 2013)
J/ApJ/788/180 : Very metal-poor stars in the Milky Way's halo (Carollo+, 2014)
J/A+A/593/A28 : Halo metal-poor stars chemical data (Fernandez-Alvar+, 2016)
J/A+A/608/A89 : Very metal poor stars in MW halo (Mashonkina+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Star Star name
12- 15 I4 K Teff Effective temperature
17- 21 F5.2 [cm/s2] logg Log10 surface gravity
23- 27 F5.2 [Sun] [Fe/H] Iron abundance wrt Sun
29- 33 F5.2 mag VMAG Absolute visual magnitude
35- 39 F5.2 Msun Mass Stellar mass
41- 45 F5.2 --- [C/Fe]3N 3D NLTE carbon to iron ratio
47- 51 F5.2 --- [O/Fe]3N 3D NLTE oxygen to iron ratio
53- 57 F5.2 --- [C/Fe]3L 3D LTE carbon to iron ratio
59- 63 F5.2 --- [O/Fe]3L 3D LTE carbon to iron ratio
65- 69 F5.2 --- [C/Fe]1N 1D NLTE carbon to iron ratio
71- 75 F5.2 --- [O/Fe]1N 1D NLTE oxygen to iron ratio
77- 81 F5.2 --- [C/Fe]1L 1D LTE carbon to iron ratio
83- 87 F5.2 --- [O/Fe]1L 1D LTE carbon to iron ratio
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Star Star name
12- 17 F6.2 pm EW412.87nm ?=- Equivalent width 412.87nm
19- 24 F6.2 [-] 3D412.87nm ?=- 3D LTE [Fe/H] 412.87nm
26- 31 F6.2 pm EW417.89nm ?=- Equivalent width 417.89nm
33- 38 F6.2 [-] 3D417.89nm ?=- 3D LTE [Fe/H] 417.89nm
40- 45 F6.2 pm EW423.32nm Equivalent width 423.32nm
47- 52 F6.2 [-] 3D423.32nm 3D LTE [Fe/H] 423.32nm
54- 59 F6.2 pm EW441.68nm ?=- Equivalent width 441.68nm
61- 66 F6.2 [-] 3D441.68nm ?=- 3D LTE [Fe/H] 441.68nm
68- 73 F6.2 pm EW448.92nm ?=- Equivalent width 448.92nm
75- 80 F6.2 [-] 3D448.92nm ?=- 3D LTE [Fe/H] 448.92nm
82- 87 F6.2 pm EW449.14nm ?=- Equivalent width 449.14nm
89- 94 F6.2 [-] 3D449.14nm ?=- 3D LTE [Fe/H] 449.14nm
96-101 F6.2 pm EW450.83nm ?=- Equivalent width 450.83nm
103-108 F6.2 [-] 3D450.83nm ?=- 3D LTE [Fe/H] 450.83nm
110-115 F6.2 pm EW451.53nm ?=- Equivalent width 451.53nm
117-122 F6.2 [-] 3D451.53nm ?=- 3D LTE [Fe/H] 451.53nm
124-129 F6.2 pm EW452.02nm ?=- Equivalent width 452.02nm
131-136 F6.2 [-] 3D452.02nm ?=- 3D LTE [Fe/H] 452.02nm
138-143 F6.2 pm EW452.26nm ?=- Equivalent width 452.26nm
145-150 F6.2 [-] 3D452.26nm ?=- 3D LTE [Fe/H] 452.26nm
152-157 F6.2 pm EW454.15nm ?=- Equivalent width 454.15nm
159-164 F6.2 [-] 3D454.15nm ?=- 3D LTE [Fe/H] 454.15nm
166-171 F6.2 pm EW455.59nm ?=- Equivalent width 455.59nm
173-178 F6.2 [-] 3D455.59nm ?=- 3D LTE [Fe/H] 455.59nm
180-185 F6.2 pm EW457.63nm ?=- Equivalent width 457.63nm
187-192 F6.2 [-] 3D457.63nm ?=- 3D LTE [Fe/H] 457.63nm
194-199 F6.2 pm EW458.28nm ?=- Equivalent width 458.28nm
201-206 F6.2 [-] 3D458.28nm ?=- 3D LTE [Fe/H] 458.28nm
208-213 F6.2 pm EW458.38nm ?=- Equivalent width 458.38nm
215-220 F6.2 [-] 3D458.38nm ?=- 3D LTE [Fe/H] 458.38nm
222-227 F6.2 pm EW462.05nm ?=- Equivalent width 462.05nm
229-234 F6.2 [-] 3D462.05nm ?=- 3D LTE [Fe/H] 462.05nm
236-241 F6.2 pm EW465.70nm ?=- Equivalent width 465.70nm
243-248 F6.2 [-] 3D465.70nm ?=- 3D LTE [Fe/H] 465.70nm
250-255 F6.2 pm EW466.67nm ?=- Equivalent width 466.67nm
257-262 F6.2 [-] 3D466.67nm ?=- 3D LTE [Fe/H] 466.67nm
264-269 F6.2 pm EW492.39nm ?=- Equivalent width 492.39nm
271-276 F6.2 [-] 3D492.39nm ?=- 3D LTE [Fe/H] 492.39nm
278-283 F6.2 pm EW499.33nm ?=- Equivalent width 499.33nm
285-290 F6.2 [-] 3D499.33nm ?=- 3D LTE [Fe/H] 499.33nm
292-297 F6.2 pm EW510.07nm ?=- Equivalent width 510.07nm
299-304 F6.2 [-] 3D510.07nm ?=- 3D LTE [Fe/H] 510.07nm
306-311 F6.2 pm EW519.76nm ?=- Equivalent width 519.76nm
313-318 F6.2 [-] 3D519.76nm ?=- 3D LTE [Fe/H] 519.76nm
320-325 F6.2 pm EW523.46nm ?=- Equivalent width 523.46nm
327-332 F6.2 [-] 3D523.46nm ?=- 3D LTE [Fe/H] 523.46nm
334-339 F6.2 pm EW532.56nm ?=- Equivalent width 532.56nm
341-346 F6.2 [-] 3D532.56nm ?=- 3D LTE [Fe/H] 532.56nm
348-353 F6.2 pm EW541.41nm ?=- Equivalent width 541.41nm
355-360 F6.2 [-] 3D541.41nm ?=- 3D LTE [Fe/H] 541.41nm
362-367 F6.2 pm EW542.52nm ?=- Equivalent width 542.52nm
369-374 F6.2 [-] 3D542.52nm ?=- 3D LTE [Fe/H] 542.52nm
376-381 F6.2 pm EW608.41nm ?=- Equivalent width 608.41nm
383-388 F6.2 [-] 3D608.41nm ?=- 3D LTE [Fe/H] 608.41nm
390-395 F6.2 pm EW614.92nm ?=- Equivalent width 614.92nm
397-402 F6.2 [-] 3D614.92nm ?=- 3D LTE [Fe/H] 614.92nm
404-409 F6.2 pm EW624.76nm ?=- Equivalent width 624.76nm
411-416 F6.2 [-] 3D624.76nm ?=- 3D LTE [Fe/H] 624.76nm
418-423 F6.2 pm EW641.69nm ?=- Equivalent width 641.69nm
425-430 F6.2 [-] 3D641.69nm ?=- 3D LTE [Fe/H] 641.69nm
432-437 F6.2 pm EW643.27nm ?=- Equivalent width 643.27nm
439-444 F6.2 [-] 3D643.27nm ?=- 3D LTE [Fe/H] 643.27nm
446-451 F6.2 pm EW645.64nm ?=- Equivalent width 645.64nm
453-458 F6.2 [-] 3D645.64nm ?=- 3D LTE [Fe/H] 645.64nm
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Star Star name
12- 17 F6.2 pm EW906.1nm ?=- Equivalent width 906.1nm
19- 24 F6.2 [-] 3N906.1nm ?=- 3D NLTE [C/Fe] 906.1nm
26- 31 F6.2 [-] 3L906.1nm ?=- 3D LTE [C/Fe] 906.1nm
33- 38 F6.2 [-] 1N906.1nm ?=- 1D NLTE [C/Fe] 906.1nm
40- 45 F6.2 [-] 1L906.1nm ?=- 1D LTE [C/Fe] 906.1nm
47- 52 F6.2 pm EW906.2nm ?=- Equivalent width 906.2nm
54- 59 F6.2 [-] 3N906.2nm ?=- 3D NLTE [C/Fe] 906.2nm
61- 66 F6.2 [-] 3L906.2nm ?=- 3D LTE [C/Fe] 906.2nm
68- 73 F6.2 [-] 1N906.2nm ?=- 1D NLTE [C/Fe] 906.2nm
75- 80 F6.2 [-] 1L906.2nm ?=- 1D LTE [C/Fe] 906.2nm
82- 87 F6.2 pm EW907.8nm ?=- Equivalent width 907.8nm
89- 94 F6.2 [-] 3N907.8nm ?=- 3D NLTE [C/Fe] 907.8nm
96-101 F6.2 [-] 3L907.8nm ?=- 3D LTE [C/Fe] 907.8nm
103-108 F6.2 [-] 1N907.8nm ?=- 1D NLTE [C/Fe] 907.8nm
110-115 F6.2 [-] 1L907.8nm ?=- 1D LTE [C/Fe] 907.8nm
117-122 F6.2 pm EW908.9nm ?=- Equivalent width 908.9nm
124-129 F6.2 [-] 3N908.9nm ?=- 3D NLTE [C/Fe] 908.9nm
131-136 F6.2 [-] 3L908.9nm ?=- 3D LTE [C/Fe] 908.9nm
138-143 F6.2 [-] 1N908.9nm ?=- 1D NLTE [C/Fe] 908.9nm
145-150 F6.2 [-] 1L908.9nm ?=- 1D LTE [C/Fe] 908.9nm
152-157 F6.2 pm EW909.5nm ?=- Equivalent width 909.5nm
159-164 F6.2 [-] 3N909.5nm ?=- 3D NLTE [C/Fe] 909.5nm
166-171 F6.2 [-] 3L909.5nm ?=- 3D LTE [C/Fe] 909.5nm
173-178 F6.2 [-] 1N909.5nm ?=- 1D NLTE [C/Fe] 909.5nm
180-185 F6.2 [-] 1L909.5nm ?=- 1D LTE [C/Fe] 909.5nm
187-192 F6.2 pm EW911.2nm ?=- Equivalent width 911.2nm
194-199 F6.2 [-] 3N911.2nm ?=- 3D NLTE [C/Fe] 911.2nm
201-206 F6.2 [-] 3L911.2nm ?=- 3D LTE [C/Fe] 911.2nm
208-213 F6.2 [-] 1N911.2nm ?=- 1D NLTE [C/Fe] 911.2nm
215-220 F6.2 [-] 1L911.2nm ?=- 1D LTE [C/Fe] 911.2nm
222-227 F6.2 pm EW940.6nm ?=- Equivalent width 940.6nm
229-234 F6.2 [-] 3N940.6nm ?=- 3D NLTE [C/Fe] 940.6nm
236-241 F6.2 [-] 3L940.6nm ?=- 3D LTE [C/Fe] 940.6nm
243-248 F6.2 [-] 1N940.6nm ?=- 1D NLTE [C/Fe] 940.6nm
250-255 F6.2 [-] 1L940.6nm ?=- 1D LTE [C/Fe] 940.6nm
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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- 10 A10 --- Star Star name
12- 17 F6.2 pm EW777.2nm ?=- Equivalent width 777.2nm
19- 24 F6.2 [-] 3N777.2nm ?=- 3D NLTE [O/Fe] 777.2nm
26- 31 F6.2 [-] 3L777.2nm ?=- 3D LTE [O/Fe] 777.2nm
33- 38 F6.2 [-] 1N777.2nm ?=- 1D NLTE [O/Fe] 777.2nm
40- 45 F6.2 [-] 1L777.2nm ?=- 1D LTE [O/Fe] 777.2nm
47- 52 F6.2 pm EW777.4nm ?=- Equivalent width 777.4nm
54- 59 F6.2 [-] 3N777.4nm ?=- 3D NLTE [O/Fe] 777.4nm
61- 66 F6.2 [-] 3L777.4nm ?=- 3D LTE [O/Fe] 777.4nm
68- 73 F6.2 [-] 1N777.4nm ?=- 1D NLTE [O/Fe] 777.4nm
75- 80 F6.2 [-] 1L777.4nm ?=- 1D LTE [O/Fe] 777.4nm
82- 87 F6.2 pm EW777.5nm ?=- Equivalent width 777.5nm
89- 94 F6.2 [-] 3N777.5nm ?=- 3D NLTE [O/Fe] 777.5nm
96-101 F6.2 [-] 3L777.5nm ?=- 3D LTE [O/Fe] 777.5nm
103-108 F6.2 [-] 1N777.5nm ?=- 1D NLTE [O/Fe] 777.5nm
110-115 F6.2 [-] 1L777.5nm ?=- 1D LTE [O/Fe] 777.5nm
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Acknowledgements:
Anish Mayur Amarsi, amarsi(at)mpia.de
(End) Patricia Vannier [CDS] 15-Jan-2019