Hyperfine Structure Constants of Energetically High-Lying Levels of Odd Parity of Atomic Vanadium

Güzelçimen, Feyza; Yapıcı, B.; Demir, Gizem; Er, A.; Öztürk, I. K.; Başar, Günay; Kröger, S.; Tamanis, M.; Ferber, R.; Docenko, Dmitrijs; Başar, Gü.

doi:10.1088/0067-0049/214/1/9

Cited by 17 publications

(12 citation statements)

References 18 publications

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“…The value for level x D 6 3 2 has not previously been published and is new. Our new measurements of A hfs for levels y F 6 1 2 and y F 6 3 2 are compared with those recently published by Güzelçimen et al (2014) and are found to have reasonable agreement considering the given experiment uncertainties. Table 1 lists the energy levels of V I included in this study along with their lifetimes.…”

Section: The Use Of Hyperfine Structure Splitting In Blended Lines Tosupporting

confidence: 75%

“…Source column: source of published hyperfine structure splitting factors: CPGC, Childs et al (1979); PBAG, Palmeri et al (1995); "new," newly found in this work. a We note that Güzelçimen et al (2014) also report new values of A hfs of (27.9 ± 0.6) × 10 −3 cm −1 for the level at 24,789 cm −1 and (6.7 ± 0.1) × 10 −3 cm −1 for the level at 24830 cm −1 . Energy level values are from Thorne et al (2011).…”

Section: Resultsmentioning

confidence: 68%

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Experimentally Measured Radiative Lifetimes and Oscillator Strengths in Neutral Vanadium

Holmes

Pickering

Ruffoni

et al. 2016

ApJS

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We report a new study of the V I atom using a combination of time-resolved laser-induced fluorescence and Fourier transform spectroscopy that contains newly measured radiative lifetimes for 25 levels between 24,648 cm −1 and 37,518 cm −1 and oscillator strengths for 208 lines between 3040 and 20000 Å from 39 upper energy levels. Thirteen of these oscillator strengths have not been reported previously. This work was conducted independently of the recent studies of neutral vanadium lifetimes and oscillator strengths carried out by Den Hartog et al. and Lawler et al., and thus serves as a means to verify those measurements. Where our data overlap with their data, we generally find extremely good agreement in both level lifetimes and oscillator strengths. However, we also find evidence that Lawler et al. have systematically underestimated oscillator strengths for lines in the region of 9000 ± 100 Å. We suggest a correction of 0.18 ± 0.03 dex for these values to bring them into agreement with our results and those of Whaling et al. We also report new measurements of hyperfine structure splitting factors for three odd levels of V I lying between 24,700 and 28,400 cm −1 .

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Section: The Use Of Hyperfine Structure Splitting In Blended Lines Tosupporting

confidence: 75%

Section: Resultsmentioning

confidence: 68%

Experimentally Measured Radiative Lifetimes and Oscillator Strengths in Neutral Vanadium

Holmes

Pickering

Ruffoni

et al. 2016

ApJS

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“…The 94 lines selected in La14 were lines found to be useful in abundance determinations on the Sun and HD 84937. An article by Güzelçimen et al (2014) appeared while La14 was in the Galley Proof stage that confirmed all but one of the FTS measurements in La14 to a fraction of an error bar.…”

Section: Appendixmentioning

confidence: 79%

“…The additional publications employed herein to generate complete HFS line component patterns are Güzelçimen et al (2014), Güzelçimen et al (2015), Unkel et al (1989), and Ho16…”

Section: Acknowledgmentsmentioning

confidence: 99%

Vanadium Transitions in the Spectrum of Arcturus

Wood

Sneden

Lawler

et al. 2018

ApJS

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We derive a new abundance for vanadium in the bright, mildly metal-poor red giant Arcturus. This star has an excellent high-resolution spectral atlas and well-understood atmospheric parameters, and it displays a rich set of neutral vanadium lines that are available for abundance extraction. We employ a newly recorded set of laboratory FTS spectra to investigate any potential discrepancies in previously reported V I log(gf) values near 900 nm.These new spectra support our earlier laboratory transition data and the calibration method utilized in that study. We then perform a synthetic spectrum analysis of weak V I features in Arcturus, deriving log ε(V) = 3.54 ± 0.01 (σ = 0.04) from 55 lines. There are no significant abundance trends with wavelength, line strength, or lower excitation energy.

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“…The average result A(V) = +1.56 ± 0.11 is in good agreement with A(V) = 1.55 from Honda et al (2004a), derived in their analysis from three lines (see Table 3 in Siqueira-Mello et al 2012 for details). We adopted seven V I and eight V II lines, including HFS based on hyperfine coupling constants from Unkel et al (1989), Palmeri et al (1995), Armstrong et al (2011), Gyzelcimen et al (2014), and Wood et al (2014), with nuclear spin I = 7/2. We only used the major V isotope in the computations (see Table 4).…”

Section: α-Elements: Mg Si S and Camentioning

confidence: 99%

High-resolution abundance analysis of HD 140283

Siqueira-Mello

Andrievsky

Barbuy

et al. 2015

A&A

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Context. HD 140283 is a reference subgiant that is metal poor and confirmed to be a very old star. The element abundances of this type of old star can constrain the nature and nucleosynthesis processes that occurred in its (even older) progenitors. The present study may shed light on nucleosynthesis processes yielding heavy elements early in the Galaxy. Aims. A detailed analysis of a high-quality spectrum is carried out, with the intent of providing a reference on stellar lines and abundances of a very old, metal-poor subgiant. We aim to derive abundances from most available and measurable spectral lines. Methods. The analysis is carried out using high-resolution (R = 81 000) and high signal-to-noise ratio (800 < S /N/pixel < 3400) spectrum, in the wavelength range 3700 < λ(Å) < 10475, obtained with a seven-hour exposure time, using the Echelle SpectroPolarimetric Device for the Observation of Stars (ESPaDOnS) at the Canada-France-Hawaii Telescope (CFHT). The calculations in local thermodynamic equilibrium (LTE) were performed with a OSMARCS 1D atmospheric model and the spectrum synthesis code Turbospectrum, while the analysis in non-LTE (NLTE) is based on the MULTI code. We present LTE abundances for 26 elements, and NLTE calculations for the species C i, O i, Na i, Mg i, Al i, K i, Ca i, Sr ii, and Ba ii lines.Results. The abundance analysis provided an extensive line list suitable for metal-poor subgiant stars. The results for Li, CNO, α-, and iron peak elements are in good agreement with literature. The newly NLTE Ba abundance, along with a NLTE Eu correction and a 3D Ba correction from literature, leads to [Eu/Ba] = +0.59 ± 0.18. This result confirms a dominant r-process contribution, possibly together with a very small contribution from the main s-process, to the neutron-capture elements in HD 140283. Overabundances of the lighter heavy elements and the high abundances derived for Ba, La, and Ce favour the operation of the weak r-process in HD 140283.

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Hyperfine Structure Constants of Energetically High-Lying Levels of Odd Parity of Atomic Vanadium

Cited by 17 publications

References 18 publications

Experimentally Measured Radiative Lifetimes and Oscillator Strengths in Neutral Vanadium

Experimentally Measured Radiative Lifetimes and Oscillator Strengths in Neutral Vanadium

Vanadium Transitions in the Spectrum of Arcturus

High-resolution abundance analysis of HD 140283

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