Nucleosynthetic history of elements in the Galactic disk

Spina, L.; Meléndez, Jorge; Karakas, Amanda I.; Ramírez, Iván; Monroe, TalaWanda R.; Asplund, Martin; Yong, David

doi:10.1051/0004-6361/201628557

Cited by 133 publications

(273 citation statements)

References 120 publications

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“…In both cases, the reduced chi-square of the fit is 1.2, and the slope coefficients are similar to those determined for solar twins alone (Nissen 2016;Spina et al 2016a). …”

Section: [X/fe]-age Correlationssupporting

confidence: 72%

High-precision abundances of elements inKeplerLEGACY stars

Nissen

Aguirre

Christensen‐Dalsgaard

et al. 2017

A&A

100

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Context. A previous study of solar twin stars has revealed the existence of correlations between some abundance ratios and stellar age providing new knowledge about nucleosynthesis and Galactic chemical evolution. Aims. High-precision abundances of elements are determined for stars with asteroseismic ages in order to test the solar twin relations. Methods. HARPS-N spectra with signal-to-noise ratios S /N > ∼ 250 and MARCS model atmospheres were used to derive abundances of C, O, Na, Mg, Al, Si, Ca, Ti, Cr, Fe, Ni, Zn, and Y in ten stars from the Kepler LEGACY sample (including the binary pair 16 Cyg A and B) selected to have metallicities in the range −0.15 < [Fe/H] < +0.15 and ages between 1 and 7 Gyr. Stellar gravities were obtained from seismic data and effective temperatures were determined by comparing non-LTE iron abundances derived from Fe i and Fe ii lines. Available non-LTE corrections were also applied when deriving abundances of the other elements.

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“…In both cases, the reduced chi-square of the fit is 1.2, and the slope coefficients are similar to those determined for solar twins alone (Nissen 2016;Spina et al 2016a). …”

Section: [X/fe]-age Correlationssupporting

confidence: 72%

High-precision abundances of elements inKeplerLEGACY stars

Nissen

Aguirre

Christensen‐Dalsgaard

et al. 2017

A&A

100

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“…Recent spectroscopic surveys of solar twins have shown evidence of strong age-dependent trends in s-process elements (e.g. Tucci Maia et al 2016;Spina et al 2016;Reddy & Lambert 2017;Spina et al 2018). The star's high Barium abundance ([Ba/Fe] = +0.24) is typical for young solar twins, and would appear anomalously high if the star were >2 Gyr (see Fig.…”

Section: Discussionmentioning

confidence: 99%

From Scattered-light to Millimeter Emission: A Comprehensive View of the Gigayear-old System of HD 202628 and its Eccentric Debris Ring

Faramaz

Krist

Stapelfeldt

et al. 2019

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We present here new observations of the eccentric debris ring surrounding the Gyr-old solar-type star HD 202628: at millimeter wavelengths with ALMA, at far-infrared wavelengths with Herschel, and in scattered light with HST. The ring inner edge is found to be consistent between ALMA and HST data. As radiation pressure affects small grains seen in scattered-light, the ring appears broader at optical than at millimeter wavelengths. The best fit to the ring seen with ALMA has inner and outer edges at 143.1 ± 1.7 AU and 165.5 ± 1.4, respectively, and an inclination of 57.4 • ± 0.4 from face-on. The offset of the ring centre of symmetry from the star allows us to quantify its eccentricity to be e = 0.09 +0.02 −0.01 . This eccentric feature is also detected in low resolution Herschel /PACS observations, under the form of a pericenter-glow. Combining the infrared and millimeter photometry, we retrieve a disk grain size distribution index of ∼ −3.4, and therefore exclude in-situ formation of the inferred belt-shaping perturber, for which we provide new dynamical constraints. Finally, ALMA images show four point-like sources that exceed 100 µJy, one of them being just interior to the ring. Although the presence of a background object cannot be excluded, we cannot exclude either that this source is circumplanetary material surrounding the belt-shaper, in which case degeneracies between its mass and orbital parameters could be lifted, allowing us to fully characterize such a distant planet in this mass and age regime for the very first time.

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“…On the one hand, giant stars appear to be much more concentrated on the plane, thus likely belonging preferentially to a younger population than the dwarfs. On the other hand, Zn-poor giants appear to prevalently belong to the inner disk, and all display Spina et al (2016) in a study of 9 objects. The much more heterogeneous, and lower quality GES sample cannot detect such subtle variations, and lacks precise age estimates: in Fig.…”

Section: Zinc Over Ironmentioning

confidence: 98%

TheGaia-ESO Survey: Galactic evolution of sulphur and zinc

Duffau

Caffau

Sbordone

et al. 2017

A&A

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Context. Due to their volatile nature, when sulphur and zinc are observed in external galaxies, their determined abundances represent the gas-phase abundances in the interstellar medium. This implies that they can be used as tracers of the chemical enrichment of matter in the Universe at high redshift. Comparable observations in stars are more difficult and, until recently, plagued by small number statistics. Aims. We wish to exploit the Gaia ESO Survey (GES) data to study the behaviour of sulphur and zinc abundances of a large number of Galactic stars, in a homogeneous way. Methods. By using the UVES spectra of the GES sample, we are able to assemble a sample of 1301 Galactic stars, including stars in open and globular clusters in which both sulphur and zinc were measured. Results. We confirm the results from the literature that sulphur behaves as an α-element. We find a large scatter in [Zn/Fe] ratios among giant stars around solar metallicity. The lower ratios are observed in giant stars at Galactocentric distances less than 7.5 kpc. No such effect is observed among dwarf stars, since they do not extend to that radius. Conclusions. Given the sample selection, giants and dwarfs are observed at different Galactic locations, and it is plausible, and compatible with simple calculations, that Zn-poor giants trace a younger population more polluted by SN Ia yields. It is necessary to extend observations in order to observe both giants and dwarfs at the same Galactic location. Further theoretical work on the evolution of zinc is also necessary.

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Nucleosynthetic history of elements in the Galactic disk

Cited by 133 publications

References 120 publications

High-precision abundances of elements inKeplerLEGACY stars

High-precision abundances of elements inKeplerLEGACY stars

From Scattered-light to Millimeter Emission: A Comprehensive View of the Gigayear-old System of HD 202628 and its Eccentric Debris Ring

TheGaia-ESO Survey: Galactic evolution of sulphur and zinc

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