Hydrogen atoms in arbitrary magnetic fields. II. Bound-bound transitions

Förster, Henry; Strupat, W.; Rosner, W.; Wunner, G.; Ruder, H.; Herold, H.

doi:10.1088/0022-3700/17/7/015

Cited by 88 publications

(60 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Wavelengths are determined using energy levels from Rösner et al (1984). The oscillator strengths of permitted ultraviolet and optical lines are from Kemic (1974), Forster et al (1984), Wunner et al (1985), , and Wunner, Geyer, & Ruder (1987) and follow our original compilation (Ferrario et al 1997). Figure 6 shows FUV spectroscopy resolved in 10 separate phases.…”

Section: Tablementioning

confidence: 82%

“…Table 3 summarizes the photospheric spectral line identifications. We considered all transitions between all levels tabulated in Rö sner et al (1984) and, in particular, transitions between levels coupled following selection rules in the presence of a magnetic field (Forster et al 1984). Zero-field states labelled with their usual quantum numbers nlm are described in the presence of a magnetic field by high-field states labelled by the numbers NMl, where M is the magnetic quantum number and l defines the z parity of the states [ ¼ ðÀ1Þ l ].…”

Section: Phase-resolved Fuv Spectroscopymentioning

confidence: 99%

See 1 more Smart Citation

A Multiwavelength Study of the High‐Field Magnetic White Dwarf EUVE J0317−85.5 (=RE J0317−853)

Vennes

Schmidt

Ferrario

et al. 2003

ApJ

View full text Add to dashboard Cite

We present optical and ultraviolet photometry and spectroscopy and optical circular spectropolarimetry of the ultramassive, rapidly rotating, high-field magnetic white dwarf EUVE J0317À85.5. From the combined data sets, we establish an ephemeris for the photometric, spectroscopic, and polarimetric variations with a spin period of 725.7277 s, the fastest yet measured for an isolated white dwarf. We build a series of far-ultraviolet (FUV) and optical flux spectra as well as optical polarization spectra that describe the atmospheric properties as a function of rotation phase. Twelve components of the Lyman line series are identified in the FUV: seven of them are forbidden lines enforced by the electric field that permeates the strongly magnetized photosphere. Attempts at modeling the FUV and optical data with two classes of models indicate an unusual field structure on the star. Both offset-dipole and multipolar expansion models fail to adequately reproduce the spectroscopic and polarimetric properties simultaneously, and we postulate that the surface of EUVE J0317À85.5 may be punctuated by a high-field magnetic spot. Subject headings: stars: individual (EUVE J0317À85.5) -stars: magnetic fields -ultraviolet: starswhite dwarfs On-line material: color figure

show abstract

Section: Tablementioning

confidence: 82%

Section: Phase-resolved Fuv Spectroscopymentioning

confidence: 99%

A Multiwavelength Study of the High‐Field Magnetic White Dwarf EUVE J0317−85.5 (=RE J0317−853)

Vennes

Schmidt

Ferrario

et al. 2003

ApJ

View full text Add to dashboard Cite

show abstract

“…As a first step of the analysis, we compare the positions and strengths of the most prominent features in the observed spectra with the expected field-dependent wavelengths of the hydrogen transitions λ H (B), henceforth referred to as λ-B curves (Forster et al 1984;Rösner et al 1984;Wunner et al 1985). In Fig.…”

Section: Qualitative Analysis Of the Magnetic Field Geometrymentioning

confidence: 99%

Zeeman tomography of magnetic white dwarfs

Euchner¹,

Jordan²,

Beuermann³

et al. 2006

A&A

View full text Add to dashboard Cite

Aims. We analyse the magnetic field geometry of the magnetic DA white dwarf PG 1015+014 with our Zeeman tomography method. Methods. This study is based on rotation-phase resolved optical flux and circular polarization spectra of PG 1015+014 obtained with FORS1 at the ESO VLT. Our tomographic code makes use of an extensive database of pre-computed Zeeman spectra. The general approach has been described in Papers I and II of this series. Results. The surface field strength distributions for all rotational phases of PG 1015+014 are characterised by a strong peak at 70 MG. A separate peak at 80 MG is seen for about one third of the rotation cycle. Significant contributions to the Zeeman features arise from regions with field strengths between 50 and 90 MG. We obtain equally good simultaneous fits to the observations, collected in five phase bins, for two different field parametrizations: (i) a superposition of individually tilted and off-centred zonal multipole components; and (ii) a truncated multipole expansion up to degree l = 4 including all zonal and tesseral components. The magnetic fields generated by both parametrizations exhibit a similar global structure of the absolute surface field values, but differ considerably in the topology of the field lines. An effective photospheric temperature of T eff = 10 000 ± 1000 K was found. Conclusions. Remaining discrepancies between the observations and our best-fit models suggest that additional small-scale structure of the magnetic field exists which our field models are unable to cover due to the restricted number of free parameters.

show abstract

“…The corresponding oscillator strengths have been computed and tabulated by Forster et al (1984). With an accuracy of 1-2%, at 0 ≤ γ ≤ 10 4 , they are reproduced by a single five-parameter formula…”

Section: Oscillator Strengthsmentioning

confidence: 99%

Hydrogen atom moving across a strong magnetic field: analytical approximations

Potekhin

1998

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

Abstract. Analytical approximations are constructed for binding energies, quantum-mechanical sizes and oscillator strengths of main radiative transitions of hydrogen atoms arbitrarily moving in magnetic fields ∼ 10 12 − 10 13 G. Examples of using the obtained approximations for determination of maximum transverse velocity of an atom and for evaluation of absorption spectra in magnetic neutron star atmospheres are presented.

show abstract

Hydrogen atoms in arbitrary magnetic fields. II. Bound-bound transitions

Cited by 88 publications

References 18 publications

A Multiwavelength Study of the High‐Field Magnetic White Dwarf EUVE J0317−85.5 (=RE J0317−853)

A Multiwavelength Study of the High‐Field Magnetic White Dwarf EUVE J0317−85.5 (=RE J0317−853)

Zeeman tomography of magnetic white dwarfs

Hydrogen atom moving across a strong magnetic field: analytical approximations

Contact Info

Product

Resources

About