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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 (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:
FileName Lrecl Records Explanations
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
Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
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
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).
Byte-by-byte Description of file: tablea2.dat
Bytes Format Units Label Explanations
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)
Byte-by-byte Description of file: tablea3.dat
Bytes Format Units Label Explanations
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
Byte-by-byte Description of file: tablea4.dat
Bytes Format Units Label Explanations
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)
Acknowledgements: Laura Magrini, laura(at)arcetri.astro.it
(End) Laura Magrini [Arcetri], Patricia Vannier [CDS] 13-Apr-2017
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