J/A+A/603/A2 Gaia-ESO Survey abundances radial distribution (Magrini+, 2017)
The Gaia-ESO Survey: radial distribution of abundances in the Galactic
disc from open clusters and young field stars.
Magrini L., Randich S., Kordopatis G., Prantzos N., Romano D., Chieffi A.,
Limongi M., Francois P., Pancino E., Friel E., Bragaglia A.,
Tautvaisiene G., Spina L., Overbeek J., Cantat-Gaudin T., Donati P.,
Vallenari A., Sordo R., Jimenez-Esteban F.M., Tang B., Drazdauskas A.,
Sousa S., Duffau S., Jofre P., Gilmore G., Feltzing S., Alfaro E.,
Bensby T., Flaccomio E., Koposov S., Lanzafame A., Smiljanic R., Bayo A.,
Carraro G., Casey A.R., Costado M.T., Damiani F., Franciosini E.,
Hourihane A., Lardo C., Lewis J., Monaco L., Morbidelli L., Sacco G.,
Sbordone L., Worley C.C., Zaggia S.
<Astron. Astrophys. 603, A2 (2017)>
=2017A&A...603A...2M 2017A&A...603A...2M (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Photometry, CCD
Keywords: Galaxy: abundances - open clusters and associations: general
Abstract:
The spatial distribution of elemental abundances in the disc of our
Galaxy gives insights both on its assembly process and subsequent
evolution, and on the stellar nucleogenesis of the different elements.
Gradients can be traced using several types of objects as, for
instance, (young and old) stars, open clusters, HII regions, planetary
nebulae.
We aim to trace the radial distributions of abundances of elements
produced through different nucleosynthetic channels - the
α-elements O, Mg, Si, Ca and Ti, and the iron-peak elements Fe,
Cr, Ni and Sc - by use of the Gaia-ESO IDR4 results for open
clusters and young-field stars.
From the UVES spectra of member stars, we have determined the average
composition of clusters with ages >0.1Gyr. We derived
statistical ages and distances of field stars. We traced the abundance
gradients using the cluster and field populations and compared them
with a chemo-dynamical Galactic evolutionary model.
The adopted chemo-dynamical model, with the new generation of
metallicity-dependent stellar yields for massive stars, is able to
reproduce the observed spatial distributions of abundance ratios, in
particular the abundance ratios of [O/Fe] and [Mg/Fe] in the inner
disc (5kpc<RGC<7kpc), with their differences, that were usually
poorly explained by chemical evolution models.
Oxygen and magnesium are often considered to be equivalent in tracing
α-element abundances and in deducing, for example, the formation
timescales of different Galactic stellar populations. In addition,
often [α/Fe] is computed combining several α-elements. Our
results indicate, as expected, a complex and diverse nucleosynthesis
of the various α-elements, in particular in the high metallicity
regimes, pointing towards a different origin of these elements and
highlighting the risk of considering them as a single class with
common features.
Description:
We present the stellar parameters, distances, ages, heights, radial
velocities and abundances used in the present work.
In Table A.1 we present the stellar parameters and radial velocities
of the selected member stars in open clusters, while in Table A.2
their elemental abundances.
In Table A.3 we show the stellar parameters, ages, distances and
heights on the Galactic plane of the solar neighbourhood sample of
field stars and of the inner disc stars.
In Table A.4 we present their elemental abundances in the 12+log(X/H)
form.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 82 134 Stellar parameters and radial velocities of
clusters' member stars
tablea2.dat 116 134 Elemental abundances of clusters' member stars
tablea3.dat 95 59 Stellar parameters, ages, distances, heights of
field stars
tablea4.dat 106 59 Elemental abundances of field stars
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Cluster Cluster Name (1)
11- 26 A16 --- CName Star ID
30- 33 I4 K Teff Effective Temperature
35- 37 I3 K e_Teff Error on Effective Temperature
41- 44 F4.2 --- logg Surface gravity
46- 49 F4.2 --- e_logg Error on Surface gravity
53- 57 F5.2 --- [Fe/H] Iron abundances
59- 62 F4.2 --- e_[Fe/H] Error on Iron abundances
66- 69 F4.2 km/s xi Microturbolent velocity
71- 74 F4.2 km/s e_xi Error on Microturbolent velocity
78- 82 F5.1 km/s RV Radial velocity
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Note (1): Clusters studied:
Br25 (Cl* Berkeley 25), Br44 (Cl* Berkeley 44), Br81 (Cl* Berkeley 81),
NGC2243, NGC2516, NGC4815, NGC6005, NGC6633, NGC6705, NGC6802, Pis18
(Cl* Pisimis 18), Tr20 (Cl* Trumpler 20), Tr23 (Cl* Trumpler 23).
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Cluster Cluster Name
11- 26 A16 --- CName Star ID
28- 31 F4.2 --- O/H ?=- Oxygen abundance 12+log(O/H)
33- 36 F4.2 --- e_O/H ?=- Error on oxygen abundance 12+log(O/H)
38- 41 F4.2 --- Mg/H Magnesium abundance 12+log(Mg/H)
43- 46 F4.2 --- e_Mg/H Error on magnesium abundance 12+log(Mg/H)
48- 51 F4.2 --- Si/H Silcon abundance 12+log(Si/H)
53- 56 F4.2 --- e_Si/H Error on silicon abundance 12+log(Si/H)
58- 61 F4.2 --- Ca/H Calcium abundance 12+log(Ca/H)
63- 66 F4.2 --- e_Ca/H Error on calcium abundance 12+log(Ca/H)
68- 71 F4.2 --- Ti/H Titanium abundance 12+log(Ti/H)
73- 76 F4.2 --- e_Ti/H Error on titanium abundance 12+log(Ti/H)
78- 81 F4.2 --- Sc/H Scandium abundance 12+log(Sc/H)
83- 86 F4.2 --- e_Sc/H Error on scandium abundance 12+log(Sc/H)
88- 91 F4.2 --- V/H Vanadium abundance 12+log(V/H)
93- 96 F4.2 --- e_V/H Error on vanadium abundance 12+log(V/H)
98-101 F4.2 --- Cr/H Chromum abundance 12+log(Cr/H)
103-106 F4.2 --- e_Cr/H Error on chromum abundance 12+log(Ni/H)
108-111 F4.2 --- Ni/H Nichel abundance 12+log(Ni/H)
113-116 F4.2 --- e_Ni/H Error on nichel abundance 12+log(Ni/H)
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- CName Star ID
18- 21 I4 K Teff Effective Temperature
23- 25 I3 K e_Teff Error on Effective Temperature
28- 31 F4.2 --- logg Surface gravity
33- 36 F4.2 --- e_logg Error on Surface gravity
40- 44 F5.2 --- [Fe/H] Iron abundances
46- 49 F4.2 --- e_[Fe/H] Error on Iron abundances
52- 55 F4.2 km/s xi Microturbolent velocity
57- 60 F4.2 km/s e_xi Error on Microturbolent velocity
64- 67 F4.2 Gyr Age Age
68- 71 F4.2 Gyr e_Age Error on Age
75- 78 F4.2 kpc Rgc Galactocentric distance
80- 83 F4.2 kpc e_Rgc Error on Galactocentric distance
86- 90 F5.2 kpc z Height above the plane
92- 95 F4.2 kpc e_z Error on Height above the plane
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Byte-by-byte Description of file: tablea4.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- CName Star ID
18- 21 F4.2 --- O/H ?=- Oxygen abundance 12+log(O/H)
23- 26 F4.2 --- e_O/H ?=- Error on oxygen abundance 12+log(O/H)
28- 31 F4.2 --- Mg/H Magnesium abundance 12+log(Mg/H)
33- 36 F4.2 --- e_Mg/H Error on magnesium abundance 12+log(Mg/H)
38- 41 F4.2 --- Si/H Silcon abundance 12+log(Si/H)
43- 46 F4.2 --- e_Si/H Error on silicon abundance 12+log(Si/H)
48- 51 F4.2 --- Ca/H Calcium abundance 12+log(Ca/H)
53- 56 F4.2 --- e_Ca/H Error on calcium abundance 12+log(Ca/H)
58- 61 F4.2 --- Ti/H Titanium abundance 12+log(Ti/H)
63- 66 F4.2 --- e_Ti/H Error on titanium abundance 12+log(Ti/H)
68- 71 F4.2 --- Sc/H Scandium abundance 12+log(Sc/H)
73- 76 F4.2 --- e_Sc/H Error on scandium abundance 12+log(Sc/H)
78- 81 F4.2 --- V/H Vanadium abundance 12+log(V/H)
83- 86 F4.2 --- e_V/H Error on vanadium abundance 12+log(V/H)
88- 91 F4.2 --- Cr/H Chromum abundance 12+log(Cr/H)
93- 96 F4.2 --- e_Cr/H Error on chromum abundance 12+log(Ni/H)
98-101 F4.2 --- Ni/H Nichel abundance 12+log(Ni/H)
103-106 F4.2 --- e_Ni/H Error on nichel abundance 12+log(Ni/H)
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Acknowledgements:
Laura Magrini, laura(at)arcetri.astro.it
(End) Laura Magrini [Arcetri], Patricia Vannier [CDS] 13-Apr-2017