Atoms in high magnetic fields (white dwarfs)

Garstang, Roy H.

doi:10.1088/0034-4885/40/2/001

Cited by 380 publications

(155 citation statements)

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“…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 ]. Applicable selection rules in the presence of a strong but finite field are DM ¼ AE1 if the z parity remains unchanged, i.e., Dl is even, and DM ¼ 0 if the z parity changes, i.e., Dl is odd (Garstang 1977).…”

Section: Phase-resolved Fuv Spectroscopymentioning

confidence: 99%

“…Note that the line H 2s0-4 f0 is forbidden at zero field where electric dipole selection rules apply but is allowed in the presence of a strong magnetic field where selection rules based on the parity and the magnetic quantum number apply. We shall refer to such lines as '' permitted '' under the circumstances (see a review by Garstang 1977).…”

Section: Introductionmentioning

confidence: 99%

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

Vennes

Schmidt

Ferrario

et al. 2003

ApJ

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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

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Section: Phase-resolved Fuv Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

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

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“…It is obvious that the phenomenon of quasi-one-dimensionality enhances the stability of standard atomic and molecular systems from the electrostatic point of view. In particular, molecules become elongated along the magnetic line forming a type of linear molecular polymer (for details see the review articles [4,5]). It also hints at the occurrence of exotic atomic and molecular systems which do not exist in the absence of a magnetic field.…”

Section: Introductionmentioning

confidence: 99%

“…It remains so in the presence of a constant magnetic field unless B 10 13 G, where the exotic ion H 2+ 3 appears to be the most bound (see [7]). The ion H + 2 has been widely studied, both with and without the presence of a magnetic field, due to its importance in astrophysics, atomic and molecular physics, solid state and plasma physics (see [4]- [30] and references therein). The majority of the previous studies were focused on the case of the parallel configuration, where the angle between the molecular axis and the magnetic field direction is zero, θ = 0 o .…”

Section: Introductionmentioning

confidence: 99%

H2+molecular ion in a strong magnetic field: Ground state

Turbiner

Vieyra

2003

Phys. Rev. A

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A detailed quantitative analysis of the system (ppe) placed in magnetic field ranging from 0 − 4.414 × 10 13 G is presented. The present study is focused on the question of the existence of the molecular ion H + 2 in a magnetic field. As a tool, a variational method with an optimization of the form of the vector potential (optimal gauge fixing) is used. It is shown that in the domain of applicability of the non-relativistic approximation the system (ppe) in the Born-Oppenheimer approximation has a well-pronounced minimum in the total energy at a finite interproton distance for B 10 11 G, thus manifesting the existence of H + 2 . For B 10 11 G and large inclinations (of the molecular axis with respect to the magnetic line) the minimum disappears and hence the molecular ion H + 2 does not exist. It is shown that the most stable configuration of H + 2 always corresponds to protons situated along the magnetic line. With magnetic field growth the ion H + 2 becomes more and more tightly bound and compact, and the electronic distribution evolves from a two-peak to a one-peak pattern. The domain of inclinations where the H + 2 ion exists reduces with magnetic field increase and finally becomes 0 o − 25 o at B = 4.414 × 10 13 G. Phase transition type behavior of variational parameters for some interproton distances related to the beginning of the chemical reaction H +

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“…The area has been reviewed by Garstang. 19 Very accurate calculations have been reported by Rösner et al 20 The results of Makado and McGill 21 include energies for a large number of states at a large number of magnetic fields. The uncertainty in these calculated results is much less than that in the experimental data.…”

Section: Theorymentioning

confidence: 93%