Observational constraints on potassium synthesis during the formation of stars of the Galactic disk

Shimansky, V. V.; Bikmaev, I.; Galeev, A.; Shimanskaya, N. N.; Ivanova, Desislava; Сахибуллин, Н. А.; Мусаев, Ф. А.; Галазутдинов, Г. А.

doi:10.1134/1.1611216

Cited by 18 publications

(19 citation statements)

References 13 publications

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“…We find two stars (HD 60319 and HD 208906) in our sample in common with Shimansky et al (2003). The agreement is good and differences between the NLTE abundances are 0.04 and 0.08 dex.…”

Section: Comparison With Other Nlte Worksupporting

confidence: 68%

“…Takeda et al (1996Takeda et al ( , 2002 predicted large NLTE corrections for the potassium abundance analysis of the Sun and metal-poor stars, however their effect on the [K/Fe] vs. [Fe/H] relation is not large, since these corrections do not show any significant dependance on the metal abundance. Ivanova & Shimansky (2000) and Shimansky et al (2003) also found large NLTE corrections of the potassium abundance, and their [K/Fe] NLTE of disk stars decreases systematically from 0.3 to −0.1 when the stellar metal abundance increases from [Fe/H] = −1.0 to 0.2; this is in agrement with the results of Galactic chemical evolution models. Zhang et al (2006, hereafter Paper I) investigated the formation of neutral potassium lines in the solar photosphere based on extensive statistical equilibrium calculations, and obtained a solar potassium abundance of log ε (K) = 5.12, which is close to the meteoritic abundance of 5.12 (Grevesse & Sauval 1998) or 5.09 (Lodders 2003).…”

Section: Introductionsupporting

confidence: 64%

“…As noticed in previous studies (Takeda et al 2002;Shimansky et al 2003), the model of Timmes et al (1995) based on yields and Salpeter's (1955) Initial Mass Function (IMF) apparently contradicts the supersolar [K/Fe] trend in metal-poor stars. Our observational data of thin disk and halo stars are consistent with the theoretical prediction of Goswami & Prantzos (2000) who used Kroupa et al's (1993) IMF.…”

Section: Nlte Effectsmentioning

confidence: 67%

“…Potassium abundances of metal-poor stars have been determined recently by Takeda et al (2002) and Shimansky et al (2003), both based on NLTE analysis. We find two stars (HD 60319 and HD 208906) in our sample in common with Shimansky et al (2003).…”

Section: Comparison With Other Nlte Workmentioning

confidence: 99%

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Potassium abundances in nearby metal-poor stars

Zhang

Gehren

Butler

et al. 2006

A&A

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Aims. The potassium abundances for 58 metal-poor stars are determined using high-resolution spectroscopy. The abundance trends in stars of different population are discussed. Methods. All abundance results have been derived from NLTE statistical equilibrium calculations and spectrum synthesis methods. Results. The NLTE corrections are significant (−0.20 to −0.55 dex) and they depend on the effective temperatures and surface gravities. The potassium abundances of thin disk, thick disk and halo stars show distinct trends, such as in the case of the α-elements.

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“…We find two stars (HD 60319 and HD 208906) in our sample in common with Shimansky et al (2003). The agreement is good and differences between the NLTE abundances are 0.04 and 0.08 dex.…”

Section: Comparison With Other Nlte Worksupporting

confidence: 68%

Section: Introductionsupporting

confidence: 64%

Section: Nlte Effectsmentioning

confidence: 67%

Section: Comparison With Other Nlte Workmentioning

confidence: 99%

See 2 more Smart Citations

Potassium abundances in nearby metal-poor stars

Zhang

Gehren

Butler

et al. 2006

A&A

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“…from chemical evolution models (Timmes et al 1995;Romano et al 2010) or optical (Shimansky et al 2003;Andrievsky et al 2010) or X-ray (Phillips et al 2015) line studies. Possible difference of…”

Section: Methodsmentioning

confidence: 99%

Checking the potassium origin of the new emission line at 3.5 keV using the K xix line complex at 3.7 keV

Iakubovskyi

2015

Mon. Not. R. Astron. Soc.

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Whether the new line at ∼3.5 keV, recently detected in different samples of galaxy clusters, Andromeda galaxy and central part of our Galaxy, is due to Potassium emission lines, is now unclear. By using the latest astrophysical atomic emission line database AtomDB v. 3.0.2, we show that the most prospective method to directly check its Potassium origin will be the study of K XIX emission line complex at ∼3.7 keV with future X-ray imaging spectrometers such as Soft X-ray spectometer on-board Astro-H mission or microcalorimeter on-board Micro-X sounding rocket experiment. To further reduce the remaining (factor ∼ 3 − 5) uncertainty of the 3.7/3.5 keV ratio one should perform more precise modeling including removal of significant spatial inhomogeneities, detailed treatment of background components, and further extension of the modeled energy range.

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Calculating solar equivalence ratios of the four major heat-producing radiogenic isotopes in the Earth's crust and mantle

Siegel

Brown

Vilbiss

et al. 2016

Ecological Modelling

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As part of the ongoing work in defining a consistent and unified geobiosphere emergy baseline (GEB) this paper considers the radiogenic component of the available energy from geothermal sources (one third of the global tripartite: solar radiation, dissipation of tidal momentum, and geothermal exergy). Recent literature suggests that Earth's geothermal energy results from two very different sources, decay of radioisotopes and primordial heat (heat left from Earth's accretion). In previous baseline computations, the radiogenic component of geothermal exergy was added to primordial heat, given various names like "deep earth heat", and a single transformity was computed for the combined sources. With the acknowledgment that the geothermal component of the GEB had two different sources, it became apparent that a single transformity may no longer be appropriate, thus a method of computing separate transformities was necessary. In a novel approach, this paper uses gravity as the primary input to both solar radiation and heavy radionuclides and computes gravitational transformities for both. Then solar equivalence ratios (SERs) are computed between solar radiation and the four major crustal radionuclides (238 U, 235 U, 232 Th, 40 K). The SERs are combined with published radiogenic geothermal exergy data to calculate the solar equivalent exergy of the radiogenic

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Observational constraints on potassium synthesis during the formation of stars of the Galactic disk

Cited by 18 publications

References 13 publications

Potassium abundances in nearby metal-poor stars

Potassium abundances in nearby metal-poor stars

Checking the potassium origin of the new emission line at 3.5 keV using the K xix line complex at 3.7 keV

Calculating solar equivalence ratios of the four major heat-producing radiogenic isotopes in the Earth's crust and mantle

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