WD 1953-011: a magnetic white dwarf with peculiar field structure
نویسندگان
چکیده
منابع مشابه
WD 1953 − 011 – a magnetic white dwarf with peculiar field structure
We present Hα spectra of the magnetic white dwarf star WD1953−011 which confirm the presence of the broad Zeeman components corresponding to a field strength ∼ 500 kG found by Maxted & Marsh (1999). We also find that the line profile is variable over a timescale of a day or less. The core of the Hα line also shows a narrow Zeeman triplet corresponding to a field strength of ∼ 100 kG which appea...
متن کاملThe pecular magnetic field morphology of the white dwarf WD 1953 - 011 : evidence for a large - scale magnetic flux tube ?
We present and interpret new spectropolarimetric observations of the magnetic white dwarf WD1953-011. Circular polarization and intensity spectra of the Hα spectral line demonstrate the presence of two-component magnetic field in the photosphere of this star. The geometry consists of a weak, large scale component, and a strong, localized component. Analyzing the rotationally modulated low-field...
متن کاملThe Halo White Dwarf WD 0346+246 Revisited
The extreme helium-rich atmospheric composition determined for the halo white dwarf WD 0346+246 is reexamined. This solution is shown to be improbable from an astrophysical point of view when accretion of hydrogen and metals from the interstellar medium is taken into account. An alternate solution is proposed where hydrogen and helium are present in the atmospheric regions in equal amounts. The...
متن کاملHE 0241 - 0155 - Evidence for a large scale homogeneous field in a highly magnetic white dwarf ⋆
In the course of the Hamburg/ESO survey we have discovered a white dwarf whose spectrum exhibits many similarities with the prototype of magnetic white dwarfs Grw+70◦8247. In particular several stationary line components indicative for magnetic fields between about 150 and 400 MG are found in both objects. However, the features between 5000 and 5500 Å in the spectrum of HE0241-0155 cannot be ex...
متن کاملSi:P as a laboratory analogue for hydrogen on high magnetic field white dwarf stars.
Laboratory spectroscopy of atomic hydrogen in a magnetic flux density of 10(5) T (1 gigagauss), the maximum observed on high-field magnetic white dwarfs, is impossible because practically available fields are about a thousand times less. In this regime, the cyclotron and binding energies become equal. Here we demonstrate Lyman series spectra for phosphorus impurities in silicon up to the equiva...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2000
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.2000.03636.x