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J/MNRAS/474/2580   Temporal evolution of neutron-capture elements (Spina+, 2018)

The temporal evolution of neutron-capture elements in the Galactic discs. Spina L., Melendez J., Karakas A.I., dos Santos L., Bedell M., Asplund M., Ramirez I., Yong D., Alves-Brito A., Bean J.L., Dreizler S. <Mon. Not. R. Astron. Soc., 474, 2580-2593 (2018)> =2018MNRAS.474.2580S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, G-type ; Abundances Keywords: stars: abundances - Galaxy: abundances - Galaxy: disc - Galaxy: evolution Abstract: Important insights into the formation and evolution of the Galactic disc(s) are contained in the chemical compositions of stars. We analysed high-resolution and high signal-to-noise HARPS spectra of 79 solar twin stars in order to obtain precise determinations of their atmospheric parameters, ages (σ∼0.4Gyr) and chemical abundances (σ<0.01dex) of 12 neutron-capture elements (Sr, Y, Zr, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd and Dy). This valuable data set allows us to study the [X/Fe]-age relations over a time interval of ∼10Gyr and among stars belonging to the thin and thick discs. These relations show that (i) the s-process has been the main channel of nucleosynthesis of n-capture elements during the evolution of the thin disc; (ii) the thick disc is rich in r-process elements which suggests that its formation has been rapid and intensive. In addition, the heavy (Ba, La, Ce) and light (Sr, Y, Zr) s-process elements revealed details on the dependence between the yields of AGB stars and the stellar mass or metallicity. Finally, we confirmed that both [Y/Mg] and [Y/Al] ratios can be employed as stellar clocks, allowing ages of solar twin stars to be estimated with an average precision of ∼0.5Gyr. Description: Spectroscopic parameters and abundances for the 79 solar twin stars analysed in this paper. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 86 79 The list of the 79 solar twins stars analysed in this paper table2.dat 83 79 Atmospheric parameters determined through our analysis table3.dat 191 79 Chemical abundances of the n-capture elements determined for the sample of 79 solar twin stars table4.dat 105 79 Stellar ages and masses determined for the sample of 79 solar twins
See also: J/A+A/508/L17 : Abundances in solar analogs (Ramirez+, 2009) J/ApJ/790/L23 : Solar analogs & twins rotation by Kepler (do Nascimento+ 2014) J/A+A/574/A124 : Spectroscopy of solar twins and analogues (Datson+, 2015) J/A+A/587/A131 : Solar twins in the ELODIE archive (Mahdi+, 2016) J/A+A/592/A156 : The Solar Twin Planet Search. IV. (dos Santos+, 2016) J/ApJ/839/94 : Abundances of solar twins from Keck/HIRES (Bedell+, 2017) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HIP HIP identification number 8- 13 A6 --- HD HD name 15- 16 I2 h RAh Right ascension (J2000.0) 18- 19 I2 min RAm Right ascension (J2000.0) 21- 26 F6.3 s RAs Right ascension (J2000.0) 28 A1 --- DE- Declination sign (J2000.0) 29- 30 I2 deg DEd Declination (J2000.0) 32- 33 I2 arcmin DEm Declination (J2000.0) 35- 39 F5.2 arcsec DEs Declination (J2000.0) 41- 45 F5.3 mag Vmag V magnitude (Johnson) 47- 51 F5.3 mag e_Vmag Error V magnitude (Johnson) 53- 57 F5.2 mas plx Parallax 59- 62 F4.2 mas e_plx Error parallax 64- 72 A9 --- r_plx Reference parallax 74- 86 A13 --- Bin Binarity
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [HIP] 4- 9 I6 --- HIP HIP identification number 11- 12 I2 h RAh Right ascension (J2000.0) 14- 15 I2 min RAm Right ascension (J2000.0) 17- 22 F6.3 s RAs Right ascension (J2000.0) 24 A1 --- DE- Declination sign (J2000.0) 25- 26 I2 deg DEd Declination (J2000.0) 28- 29 I2 arcmin DEm Declination (J2000.0) 31- 35 F5.2 arcsec DEs Declination (J2000.0) 37- 40 I4 pix-1 SNR Signal-to-noise ratio 42- 45 I4 K Teff Effective temperature 47- 48 I2 K e_Teff Error of effective temperature 50- 54 F5.3 [cm/s2] logg Surface gravity 56- 60 F5.3 [cm/s2] e_logg Error of Surface gravity 62- 67 F6.3 --- [Fe/H] Iron abundance 69- 73 F5.3 --- e_[Fe/H] Error of iron abundance 75- 78 F4.2 km/s Xi Microturbulence 80- 83 F4.2 km/s e_Xi Error of microturbulence
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [HIP] 4- 9 I6 --- HIP HIP identification number 11- 12 I2 h RAh Right ascension (J2000.0) 14- 15 I2 min RAm Right ascension (J2000.0) 17- 22 F6.3 s RAs Right ascension (J2000.0) 24 A1 --- DE- Declination sign (J2000.0) 25- 26 I2 deg DEd Declination (J2000.0) 28- 29 I2 arcmin DEm Declination (J2000.0) 31- 35 F5.2 arcsec DEs Declination (J2000.0) 37- 42 F6.3 --- [SrI/H] SrI abundance 44- 48 F5.3 --- e_[SrI/H] Error on [SrI/H] 50- 55 F6.3 --- [YII/H] YII abundance 57- 61 F5.3 --- e_[YII/H] Error on [YII/H] 63- 68 F6.3 --- [ZrII/H] ZrII abundance 70- 74 F5.3 --- e_[ZrII/H] Error on [ZrII/H] 76- 81 F6.3 --- [BaII/H] BaII abundance 83- 87 F5.3 --- e_[BaII/H] Error on [BaII/H] 89- 94 F6.3 --- [LaII/H] LaII abundance 96-100 F5.3 --- e_[LaII/H] Error on [LaII/H] 102-107 F6.3 --- [CeII/H] CeII abundance 109-113 F5.3 --- e_[CeII/H] Error on [CeII/H] 115-120 F6.3 --- [PrII/H] PrII abundance 122-126 F5.3 --- e_[PrII/H] Error on [PrII/H] 128-133 F6.3 --- [NdII/H] NdII abundance 135-139 F5.3 --- e_[NdII/H] Error on [NdII/H] 141-146 F6.3 --- [SmII/H] SmII abundance 148-152 F5.3 --- e_[SmII/H] Error on [SmII/H] 154-159 F6.3 --- [EuII/H] EuII abundance 161-165 F5.3 --- e_[EuII/H] Error on [EuII/H] 167-172 F6.3 --- [GdII/H] GdII abundance 174-178 F5.3 --- e_[GdII/H] Error on [GdII/H] 180-185 F6.3 --- [DyII/H] DyII abundance 187-191 F5.3 --- e_[DyII/H] Error on [DyII/H]
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [HIP] 4- 9 I6 --- HIP HIP identification number 11- 12 I2 h RAh Right ascension (J2000.0) 14- 15 I2 min RAm Right ascension (J2000.0) 17- 22 F6.3 s RAs Right ascension (J2000.0) 24 A1 --- DE- Declination sign (J2000.0) 25- 26 I2 deg DEd Declination (J2000.0) 28- 29 I2 arcmin DEm Declination (J2000.0) 31- 35 F5.2 arcsec DEs Declination (J2000.0) 37- 39 F3.1 Gyr Agemp Peak of age probability distribution 41- 43 F3.1 Gyr AgeLL1s Lower limit of the 68% confidence interval in the age probability distribution 45- 47 F3.1 Gyr AgeUL1s Upper limit of the 68% confidence interval in the age probability distribution 49- 51 F3.1 Gyr AgeLL2s Lower limit of the 95% confidence interval in the age probability distribution 53- 55 F3.1 Gyr AgeUL2s Upper limit of the 95% confidence interval in the age probability distribution 57- 59 F3.1 Gyr Agemean Mean age 61- 63 F3.1 Gyr Agestd Standard deviation 65- 69 F5.3 Msun Massmp Peak of mass probability distribution 71- 75 F5.3 Msun MassLL1s Lower limit of the 68% confidence interval in the mass probability distribution 77- 81 F5.3 Msun MassUL1s Upper limit of the 68% confidence interval in the mass probability distribution 83- 87 F5.3 Msun MassLL2s Lower limit of the 95% confidence interval in the mass probability distribution 89- 93 F5.3 Msun MassUL2s Upper limit of the 95% confidence interval in the mass probability distribution 95- 99 F5.3 Msun MassMean Mean mass 101-105 F5.3 Msun MassStd Standard deviation
Acknowledgements: Lorenzo Spina, lorenzo.spina(at)monash.edu
(End) Lorenzo Spina [Monash University], Patricia Vannier [CDS] 28-Mar-2018
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