Publications (42)
K-shell photoabsorption and photoionization of trace elements. III. Isoelectronic sequences with electron number
C. Mendoza, M. A. Bautista, P. Palmeri +3
This is the final report of a three-paper series on the K-shell photoabsorption and photoionization of trace elements, namely F, Na, P, Cl, K, Sc, Ti, V, Cr, Mn, Co, Cu and Zn. K l…
Study of thorium in hypersonic gas jets: Ionization potentials of Th and Th
A. Claessens, F. Ivandikov, M. Brasseur +10
Laser ionization spectroscopy was performed on both neutral and singly ionized Th with the aim of identifying the nuclear-clock isomer in the singly charged ionic state of…
Radiative rates and opacity calculations in Ce II-IV Multiconfiguration Dirac-Hartree-Fock radiative parameters for emission lines in Ce II-IV ions and cerium opacity calculations for kilonovae
H. Carvajal Gallego, P. Palmeri, P. Quinet
Large-scale calculations of atomic structures and radiative properties have been carried out for singly, doubly- and trebly ionized cerium. For this purpose, the purely relativisti…
Plasma environment effects on K lines of astrophysical interest. II. Ionization potentials, K thresholds, radiative rates and Auger widths in Ne- through He-like iron ions (Fe xvii - Fe xxv)
J. Deprince, M. A. Bautista, S. Fritzsche +5
Aims. In the context of accretion disks around black holes, we estimate plasma-environment effects on the atomic parameters associated with the decay of K-vacancy states in highly…
Stellar laboratories III. New Ba V, Ba VI, and Ba VII oscillator strengths and the barium abundance in the hot white dwarfs G191-B2B and RE0503-289
T. Rauch, K. Werner, P. Quinet +1
For the spectral analysis of high-resolution and high-signal-to-noise (S/N) spectra of hot stars, state-of-the-art non-local thermodynamic equilibrium (NLTE) model atmospheres are…
Ab initio calculation of the 66 low lying electronic states of HeH: adiabatic and diabatic representations
J. Loreau, J. Lievin, P. Palmeri +2
We present an ab initio study of the HeH molecule. Using the quantum chemistry package MOLPRO and a large adapted basis set, we have calculated the adiabatic potential energy c…
Plasma-environment effects on K lines of astrophysical interest III. IPs, K thresholds, radiative rates, and Auger widths in Fe ix - Fe xvi
J. Deprince, M. A. Bautista, S. Fritzsche +5
Aims. In the context of black-hole accretion disks, we aim to compute the plasma-environment effects on the atomic parameters used to model the decay of K-vacancy states in moderat…
Experimental radiative lifetimes for highly excited states and calculated oscillator strengths for lines of astrophysical interest in singly ionized cobalt (Co II)
P. Quinet, V. Fivet, P. Palmeri +4
This work reports new experimental radiative lifetimes and calculated oscillator strengths for transitions of astrophysical interest in singly ionized cobalt. More precisely, ninet…
The spectrum of the roAp star HD 101065(Przybylski's star) in the Li I 6708 A spectral region
A. V. Shavrina, N. S. Polosukhina, Ya. V. Pavlenko +8
We carried out a detailed analysis of spectra of the unique roAp star HD 101065 (Przybylski's star) near the resonance doublet Li I 6708 A, using a most complete line list includin…
Stellar laboratories IV. New Ga IV, Ga V, and Ga VI oscillator strengths and the gallium abundance in the hot white dwarfs G191-B2B and RE0503-289
T. Rauch, K. Werner, P. Quinet +1
For the spectral analysis of high-resolution and high-signal-to-noise (S/N) spectra of hot stars, advanced non-local thermodynamic equilibrium (NLTE) model atmospheres are mandator…
K-shell photoionization of Nickel ions using R-matrix
M. C. Witthoeft, M. A. Bautista, J. Garcia +4
We present R-matrix calculations of photoabsorption and photoionization cross sections across the K edge of the Li-like to Ca-like ions stages of Ni. Level-resolved, Breit-Pauli ca…
K-shell photoabsorption and photoionization of trace elements. II. Isoelectronic sequences with electron number
C. Mendoza, M. A. Bautista, P. Palmeri +3
We are concerned with improving the diagnostic potential of the K lines and edges of elements with low cosmic abundances that are observed in the X-ray spectra of supernova remnant…
Radiative transition rates and collision strengths for Si II
M. A. Bautista, P. Quinet, P. Palmeri +3
Aims. This work reports radiative transition rates and electron impact excitation collision strengths for levels of the 3s23p, 3s3p2, 3s24s, and 3s23d configurations of Siii. Metho…
K-shell photoionization of Na-like to Cl-like ions of Mg, Si, S, Ar, and Ca
M. C. Witthoeft, J. GarcÃa, T. R. Kallman +4
We present -matrix calculations of photoabsorption and photoionization cross sections across the K-edge of Mg, Si, S, Ar, and Ca ions with more than 10 electrons. The calculatio…
K-vacancy levels in Ne, Mg, Si, S, Ar, and Ca
P. Palmeri, P. Quinet, C. Mendoza +3
The HFR and AUTOSTRUCTURE atomic structure codes are used to compute complete data sets of level energies, wavelengths, A-values, and radiative and Auger widths for K-vacancy state…
Complete spectral energy distribution of the hot, helium-rich white dwarf RX J0503.9-2854
D. Hoyer, T. Rauch, K. Werner +2
In the line-of-sight toward the DO-type white dwarf RX J0503.9-2854, the density of the interstellar medium (ISM) is very low, and thus the contamination of the stellar spectrum al…
Detection of forbidden line components of lithium-like carbon in stellar spectra
K. Werner, T. Rauch, D. Hoyer +1
We report the first identification of forbidden line components from an element heavier than helium in the spectrum of astrophysical plasmas. As yet, these components were identifi…
Stellar laboratories II. New Zn IV and Zn V oscillator strengths and their validation in the hot white dwarfs G191-B2B and RE0503-289
T. Rauch, K. Werner, P. Quinet +1
For the spectral analysis of high-resolution and high-signal-to-noise spectra of hot stars, state-of-the-art non-local thermodynamic equilibrium (NLTE) model-atmospheres are mandat…
A Quantitative Comparison of Opacities Calculated Using the Distorted- Wave and -Matrix Methods
F. Delahaye, N. R. Badnell, C. P. Ballance +7
The present debate on the reliability of astrophysical opacities has reached a new climax with the recent measurements of Fe opacities on the Z-machine at the Sandia National Labor…
Stellar laboratories. VI. New Mo IV - VII oscillator strengths and the molybdenum abundance in the hot white dwarfs G191-B2B and RE0503-289
T. Rauch, P. Quinet, D. Hoyer +3
For the spectral analysis of high-resolution and high-signal-to-noise (S/N) spectra of hot stars, state-of-the-art non-local thermodynamic equilibrium (NLTE) model atmospheres are…
Evidence for neutron capture in heavy-metal hot subdwarfs: Far-UV spectroscopy of EC22536-5304 and LSIV-14 116
M. Dorsch, C. S. Jeffery, J. Deprince +8
Most hot subdwarfs (sdO/B) are low-mass core-helium-burning stars formed through binary interaction. A subgroup of intermediate He-rich sdOBs shows extreme heavy-metal (Z>30) enric…
Radiative data for highly excited 3d8 4d levels in Ni II from laboratory measurements and atomic calculations
H. Hartman, L. Engstrom, H. Lundberg +6
This work reports new experimental radiative lifetimes and calculated oscillator strengths for transitions from 3d8 4d levels of astrophysical interest in singly ionized nickel. Ra…
Stellar laboratories. X. New Cu IV - VII oscillator strengths and the first detection of copper and indium in hot white dwarfs
T. Rauch, S. Gamrath, P. Quinet +4
Accurate atomic data is an essential ingredient for the calculation of reliable non-local thermodynamic equilibrium (NLTE) model atmospheres that are mandatory for the spectral ana…
Radiative and Auger decay data for modelling nickel K lines
P. Palmeri, P. Quinet, C. Mendoza +4
Radiative and Auger decay data have been calculated for modelling the K lines in ions of the nickel isonuclear sequence, from Ni up to Ni. Level energies, transition wa…
Nitrogen K-shell photoabsorption
J. Garcia, T. R. Kallman, M. Witthoeft +6
Reliable atomic data have been computed for the spectral modeling of the nitrogen K lines, which may lead to useful astrophysical diagnostics. Data sets comprise valence and K-vaca…
Stellar laboratories. V. The Xe VI ultraviolet spectrum and the xenon abundance in the hot DO-type white dwarf RE0503-289
T. Rauch, D. Hoyer, P. Quinet +2
For the spectral analysis of spectra of hot stars with a high resolution and high signal-to-noise ratio (S/N), advanced non-local thermodynamic equilibrium (NLTE) model atmospheres…
3D NLTE modelling of Y and Eu. Centre-to-limb variation and solar abundances
N. Storm, P. S. Barklem, S. A. Yakovleva +6
Context. Abundances of s- and r-process elements in Sun-like stars constrain nucleosynthesis in extreme astrophysical events, such as compact binary mergers and explosions of highl…
Lifetime measurements and oscillator strengths in singly ionised scandium and the solar abundance of scandium
A. Pehlivan Rhodin, M. T. Belmonte, L. Engstrom +8
The lifetimes of 17 even-parity levels (3d5s, 3d4d, 3d6s, and 4p) in the region 57743-77837 cm of singly ionised scandium (\ion{Sc}{ii}) were measured by two-step time-r…
Photoionization modeling of oxygen K absorption in the interstellar medium:the Chandra grating spectra of XTE J1817-330
E. Gatuzz, J. GarcÃa, C. Mendoza +6
We present detailed analyses of oxygen K absorption in the interstellar medium (ISM) using four high-resolution Chandra spectra towards the X-ray low-mass binary XTE J1817-330. The…
Stellar laboratories. VII. New Kr IV - VII oscillator strengths and an improved spectral analysis of the hot, hydrogen-deficient DO-type white dwarf RE0503-289
T. Rauch, P. Quinet, D. Hoyer +4
For the spectral analysis of high-resolution and high-signal-to-noise (S/N) spectra of hot stars, state-of-the-art non-local thermodynamic equilibrium (NLTE) model atmospheres are…
Plasma environment effects on K lines of astrophysical interest. V. Universal formulae for ionization potential and K-threshold shifts
P. Palmeri, J. Deprince, M. A. Bautista +5
Aims. We calculate the plasma environment effects on the ionization potentials (IPs) and K-thresholds used in the modeling of K lines for all the ions belonging to the isonuclear s…
Photoionization Models for High Density Gas
T. Kallman, M. Bautista, J. Deprince +5
Relativistically broadened and redshifted 6.4 -- 6.9 keV iron K lines are observed from many accretion powered objects, including X-ray binaries and active galactic nuclei (AGN). E…
Ipopv2: Photoionization of Ni XIV -- a test case
F. Delahaye, P. Palmeri, P. Quinet +1
Several years ago, M. Asplund and coauthors (2004) proposed a revision of the Solar composition. The use of this new prescription for Solar abundances in standard stellar models ge…
Opacities of Singly and Doubly Ionised Neodymium and Uranium for Kilonova Emission Modeling
A. Flörs, R. F. Silva, J. Deprince +10
Even though the electromagnetic counterpart AT2017gfo to the binary neutron star merger GW170817 is powered by the radioactive decay of r-process nuclei, only few tentative identif…
Modeling the oxygen K absorption in the interstellar medium: an {\it XMM}-Newton view of Sco X-1
J. GarcÃa, J. M. RamÃrez, T. R. Kallman +5
We investigate the absorption structure of the oxygen in the interstellar medium by analyzing {\it XMM}-Newton observations of the low mass X-ray binary Sco X-1. We use simple mode…
The Problem of the High Iron Abundance in Accretion Disks around Black Holes
J. A. GarcÃa, T. R. Kallman, M. Bautista +4
In most accreting black-hole systems the copious X-rays commonly observed from the inner-most regions are accompanied by a reflection spectrum. The latter is the signature of energ…
Stellar laboratories. VIII. New Zr IV - VII, Xe IV - V, and Xe VII oscillator strengths and the Al, Zr, and Xe abundances in the hot white dwarfs G191-B2B and RE0503-289
T. Rauch, S. Gamrath, P. Quinet +5
For the spectral analysis of high-resolution and high-signal-to-noise spectra of hot stars, state-of-the-art non-local thermodynamic equilibrium (NLTE) model atmospheres are mandat…
Stellar laboratories. IX. New Se V, Sr IV - VII, Te VI, and I VI oscillator strengths and the Se, Sr, Te, and I abundances in the hot white dwarfs G191-B2B and RE 0503-289
T. Rauch, P. Quinet, M. Knoerzer +4
To analyze spectra of hot stars, advanced non-local thermodynamic equilibrium (NLTE) model-atmosphere techniques are mandatory. Reliable atomic data is for the calculation of such…
Stellar laboratories: new Ge V and Ge VI oscillator strengths and their validation in the hot white dwarf RE 0503-289
T. Rauch, K. Werner, E. Biemont +2
State-of-the-art spectral analysis of hot stars by means of non-LTE model-atmosphere techniques has arrived at a high level of sophistication. The analysis of high-resolution and h…
First discovery of trans-iron elements in a DAO-type white dwarf (BD)
L. Löbling, M. A. Maney, T. Rauch +4
We have identified 484 lines of the trans-iron elements (TIEs) Zn, Ga, Ge, Se, Br, Kr, Sr, Zr, Mo, In, Te, I, Xe, and Ba, for the first time in the ultraviolet spectrum of a DAO-ty…
HD 65949: Rosetta Stone or Red Herring
C. R. Cowley, S. Hubrig, P. Palmeri +5
HD 65949 is a late B star with exceptionally strong Hg II at 3984[A], but it is not a typical HgMn star. The Re II spectrum is of extraordinary strength. Abundances, or upper limit…
Lithium and its isotopic ratio 6Li/7Li in the atmospheres of some sharp-lined roAp star
A. Shavrina, N. Polosukhina, S. Khan +10
The lines of lithium at 6708 A, and 6103 A, are analyzed in high resolution spectra of some sharp-lined and slowly rotating roAp stars. Three spectral synthesis codes - STARSP, ZEE…