scholarly journals An ionization pressure gauge with LaB6 emitter for long-term operation in strong magnetic fields

2018 ◽  
Vol 89 (3) ◽  
pp. 033503 ◽  
Author(s):  
U. Wenzel ◽  
T. S. Pedersen ◽  
M. Marquardt ◽  
M. Singer
Keyword(s):  
Magnetic Fields ◽  
Pressure Gauge ◽  
Strong Magnetic Fields ◽  
Term Operation

scholarly journals Long-term evolution of a magnetic massive merger product

2020 ◽  
Vol 495 (3) ◽  
pp. 2796-2812
Author(s):  
F R N Schneider ◽  
S T Ohlmann ◽  
Ph Podsiadlowski ◽  
F K Röpke ◽  
S A Balbus ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
White Dwarfs ◽  
Massive Stars ◽  
Thermal Relaxation ◽  
Long Term Evolution ◽  
Critical Surface ◽  
Single Star ◽  
Strong Magnetic Fields ◽  
Term Evolution

ABSTRACT About 10 per cent of stars more massive than ${\approx}1.5\, {\mathrm{M}}_{\odot }$ have strong, large-scale surface magnetic fields and are being discussed as progenitors of highly magnetic white dwarfs and magnetars. The origin of these fields remains uncertain. Recent three-dimensional (3D) magnetohydrodynamical simulations have shown that strong magnetic fields can be generated in the merger of two massive stars. Here, we follow the long-term evolution of such a 3D merger product in a 1D stellar evolution code. During a thermal relaxation phase after the coalescence, the merger product reaches critical surface rotation, sheds mass and then spins down primarily because of internal mass readjustments. The spin of the merger product after thermal relaxation is mainly set by the co-evolution of the star–torus structure left after coalescence. This evolution is still uncertain, so we also consider magnetic braking and other angular momentum-gain and -loss mechanisms that may influence the final spin of the merged star. Because of core compression and mixing of carbon and nitrogen in the merger, enhanced nuclear burning drives a transient convective core that greatly contributes to the rejuvenation of the star. Once the merger product relaxed back to the main sequence, it continues its evolution similar to that of a genuine single star of comparable mass. It is a slow rotator that matches the magnetic blue straggler τ Sco. Our results show that merging is a promising mechanism to explain some magnetic massive stars and it may also be key to understand the origin of the strong magnetic fields of highly magnetic white dwarfs and magnetars.

scholarly journals Wisconsin In Situ Penning (WISP) gauge: A versatile neutral pressure gauge to measure partial pressures in strong magnetic fields

2020 ◽  
Vol 91 (4) ◽  
pp. 043504
Author(s):  
T. Kremeyer ◽  
K. Flesch ◽  
O. Schmitz ◽  
G. Schlisio ◽  
U. Wenzel ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Pressure Gauge ◽  
Strong Magnetic Fields ◽  
Partial Pressures

Strong magnetic fields

1960 ◽  
Vol 70 (4) ◽  
pp. 693-714 ◽  
Author(s):  
G.M. Strakhovskii ◽  
N.V. Kravtsov
Keyword(s):  
Magnetic Fields ◽  
Strong Magnetic Fields

Magnetic molecular nanoclusters in strong magnetic fields

2002 ◽  
Vol 172 (11) ◽  
pp. 1303 ◽  
Author(s):  
Anatolii K. Zvezdin ◽  
Viktor V. Kostyuchenko ◽  
V.V. Platonov ◽  
V.I. Plis ◽  
A.I. Popov ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Strong Magnetic Fields
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