Discovery of an extremely weak magnetic field in the white dwarf LTT 16093 = WD 2047+372
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...
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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...
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The discovery of a low luminosity common proper motion companion to the white dwarf GD392 at a wide separation of 46 is reported. BV RIJHK photometry strongly indicates suppressed flux at all near infrared wavelengths. Thus, GD392B is one of the few white dwarfs to show collision-induced absorption due to the presence of photospheric H2 and the first ultracool white dwarf detected as a companio...
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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...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2016
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201628488