Erratum: “Oscillator Strengths of Transitions in Ti
                    <scp>ii</scp>
                    in the Visible and Ultraviolet Regions” (ApJS, 132, 403 [2001])

Pickering, J. C.; Thorne, Anne P.; Pérez, Ramón Pino

doi:10.1086/323910

Cited by 71 publications

(92 citation statements)

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“…4 shows the good agreement between our calculated log gf values and the values from Pickering et al (2001), particularly when they used experimental lifetimes (filled circles). Table 4 gives a more detailed comparison between our calculated log gf values and those obtained by combining the new experimental lifetimes in Table 3 with the branching fractions measured by Pickering et al (2001). A very good agreement is observed, in particular for the strongest transitions for which both sets of results agree within 10-20 per cent.…”

Section: R E S U Lt S a N D Discussionsupporting

confidence: 66%

“…In the same table, we list the most recent oscillator strengths published by Pickering et al (2001), Kurucz (2011), Wood et al (2013), and Ruczkowski et al (2014). In the work of Pickering et al (2001), the relative intensities of Ti II emission lines between 187 and 602 nm from 89 levels were measured by high-resolution Fourier transform spectrometry, using a hollow cathode lamp as light source.…”

Section: R E S U Lt S a N D Discussionmentioning

confidence: 99%

“…In the work of Pickering et al (2001), the relative intensities of Ti II emission lines between 187 and 602 nm from 89 levels were measured by high-resolution Fourier transform spectrometry, using a hollow cathode lamp as light source. The branching fractions were then combined with 39 measured and 44 computed lifetimes to give absolute transition probabilities for 624 lines.…”

Section: R E S U Lt S a N D Discussionmentioning

confidence: 99%

“…The results are obtained by combining our experimental lifetimes in Table 3 with experimental branching fractions reported by Pickering et al (2001).…”

Section: E X P E R I M E N Tmentioning

confidence: 99%

“…Various methods and spectral sources have been employed. These include absorption measurements (Wiese, Fedchak & Lawler 2001), emission studies from a shock tube (Boni 1968;Wolnik & Berthel 1973), from arc- (Tatum 1961;Roberts, Voigt & Czernichowski 1975) and spark-sources (Wobig 1962), hook method (Danzmann & Kock 1980) and Fourier transform spectroscopy (Pickering, Thorne & Perez 2001;Wood et al 2013).…”

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confidence: 99%

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Oscillator strengths for high-excitation Ti ii from laboratory measurements and calculations

Lundberg

Hartman

Engström

et al. 2016

Mon. Not. R. Astron. Soc.

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This work reports new experimental radiative lifetimes of six 3d 2 ( 3 F)5s levels in singly ionized titanium, with an energy around 63 000 cm −1 and four 3d 2 ( 3 F)4p odd parity levels where we confirm previous investigations. Combining the new 5s lifetimes with branching fractions measured previously by Pickering et al., we report 57 experimental log gf values for transitions from the 5s levels. The lifetime measurements are performed using time-resolved laser-induced fluorescence on ions produced by laser ablation. One-and two-step photon excitation is employed to reach the 4p and 5s levels, respectively. Theoretical calculations of the radiative lifetimes of the measured levels as well as of oscillator strengths for 3336 transitions from these levels are reported. The calculations are carried out by a pseudorelativistic Hartree-Fock method taking into account core-polarization effects. The theoretical results are in a good agreement with the experiments and are needed for accurate abundance determinations in astronomical objects.

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Section: R E S U Lt S a N D Discussionsupporting

confidence: 66%

Section: R E S U Lt S a N D Discussionmentioning

confidence: 99%

Section: R E S U Lt S a N D Discussionmentioning

confidence: 99%

“…The results are obtained by combining our experimental lifetimes in Table 3 with experimental branching fractions reported by Pickering et al (2001).…”

Section: E X P E R I M E N Tmentioning

confidence: 99%

mentioning

confidence: 99%

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Oscillator strengths for high-excitation Ti ii from laboratory measurements and calculations

Lundberg

Hartman

Engström

et al. 2016

Mon. Not. R. Astron. Soc.

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Energy levels of the singly ionized titanium: Ti II ion

et al. 2021

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In this work, energy levels, oscillator strengths, and transition probabilities for the Ti II ion are calculated by the Hartree-Fock pseudo-Relativistic method using the Cowan (CW) atomic structure code and by the Thomas-Fermi-Dirac-Amaldi method using the AUTOSTRUCTURE (AS) atomic structure code. We used the terms and levels generated by the 12 configurations: 3d 2 ns (n = 4-6), 3d 2 np (n = 4,5), 3d 2 nd (n = 4,5), 3d 2 4f, 3d 4s np (n = 4,5), 3d 4s 2 , 3d 3 . We improved our ab initio calculated data by using the semi-empirical methods in the CW and AS atomic structure codes. We also compared them with other theoretical and experimental results and obtained new data for this ion.

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The nature of the late B-type stars HD 67044 and HD 42035

Monier

Gebran

Royer

2016

Astrophys Space Sci

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While monitoring a sample of apparently slowly rotating superficially normal bright late B and early A stars in the northern hemisphere, we have discovered that HD 67044 and HD 42035, hitherto classified as normal late B-type stars, are actually respectively a new chemically peculiar star and a new spectroscopic binary containing a very slow rotator HD 42035 S with ultra-sharp lines (vsini = 3.7 km/s) and a fast rotator HD 42035 B with broad lines. The lines of Ti, Cr, Mn, Sr, Y, Zr and Ba are conspicuous features in the high resolution SOPHIE spectrum of HD 67044. The HgII line at 3983.93 A is also present as a weak feature. The composite spectrum of HD 42035 is characterised by very sharp lines formed in HD 42035 S superimposed onto the shallow and broad lines of HD 42035 B. These very sharp lines are mostly due to light elements from C to Ni, the only heavy species definitely present are Sr and Ba. Selected lines of 21 chemical elements from He up to Hg have been synthesized using model atmospheres computed with ATLAS9 and the spectrum synthesis code SYNSPEC48 including hyperfine structure of various isotopes when relevant. Abundances of these key elements have been derived HD 67044 and HD 42035 S. HD 67044 is found to have distinct enhancements of Ti, Cr, Mn, Sr, Y, Zr, Ba and Hg and underabundances in He, C, O, Ca and Sc which shows that this star is not a superficially normal late B-type star, but actually is a new CP star most likely of the HgMn type. HD 42035 S has provisional underabundances of the light elements from C to Ti and overabundances of heavier elements up to barium. More accurate fundamental parameters and abundances for HD 42035 S and HD 42035 B will be derived if we manage to disentangle their spectra. They will help clarify the status of the two components in this interesting new spectroscopic binary.Comment: 30 pages, 4 figures, 2 tables, accepted in APSS. arXiv admin note: text overlap with arXiv:1504.0272

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Erratum: “Oscillator Strengths of Transitions in Ti ii in the Visible and Ultraviolet Regions” (ApJS, 132, 403 [2001])

Cited by 71 publications

References 0 publications

Oscillator strengths for high-excitation Ti ii from laboratory measurements and calculations

Oscillator strengths for high-excitation Ti ii from laboratory measurements and calculations

Energy levels of the singly ionized titanium: Ti II ion

The nature of the late B-type stars HD 67044 and HD 42035

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