Zobrazeno 1 - 10
of 58
pro vyhledávání: '"Landstreet, John D."'
Autor:
Hernandez, Mercedes S., Schreiber, Matthias R., Landstreet, John D., Bagnulo, Stefano, Parsons, Steven G., Chavarria, Martin, Toloza, Odette, Bell, Keaton J.
Recent surveys of close white dwarf binaries as well as single white dwarfs have provided evidence for the late appearance of magnetic fields in white dwarfs, and a possible generation mechanism a crystallization and rotation-driven dynamo has been s
Externí odkaz:
http://arxiv.org/abs/2401.15158
Autor:
Berdyugin, Andrei V., Piirola, Vilppu, Bagnulo, Stefano, Landstreet, John D., Berdyugina, Svetlana V.
About half of white dwarfs (WDs) evolve to the DC state as they cool; the others become DQ or (temporarily?) DZ WDs. The recent magnetic survey of the local 20 pc volume has established a high frequency of magnetic fields among WDs older than 2-3 Gyr
Externí odkaz:
http://arxiv.org/abs/2301.03959
Autor:
Bagnulo, Stefano, Landstreet, John D.
The presence of a strong magnetic field is a feature common to a significant fraction of degenerate stars, yet little is understood about field origin and evolution. New observational constraints from volume-limited surveys point to a more complex si
Externí odkaz:
http://arxiv.org/abs/2208.02655
Autor:
Berdyugin, Andrei V., Piirola, Vilppu, Bagnulo, Stefano, Landstreet, John D., Berdyugina, Svetlana V.
Publikováno v:
A&A 657, A105 (2022)
Circular polarisation measurements of white dwarfs of various ages and spectral types are useful to understand the origin and evolution of the magnetic field in degenerate stars. In the latest stages of white dwarf evolution, when stars are so cool t
Externí odkaz:
http://arxiv.org/abs/2111.11174
Autor:
Wilson, David J., Toloza, Odette, Landstreet, John D., Gaensicke, Boris T., Drake, Jeremy J., Hermes, J. J., Koester, Detlev
We present the discovery of a magnetic field on the white dwarf component in the detached post common envelope binary (PCEB) CC Cet. Magnetic white dwarfs in detached PCEBs are extremely rare, in contrast to the high incidence of magnetism in single
Externí odkaz:
http://arxiv.org/abs/2108.11414
Autor:
Landstreet, John D.
I was one of the six people most closely involved in the discovery of the first magnetic white dwarf in 1970, now 50 years ago. Thinking back on this event, I have realised that the discovery occurred when and how it did because of a series of lucky
Externí odkaz:
http://arxiv.org/abs/2008.01802
Publikováno v:
A&A 636, A6 (2020)
How magnetic fields contribute to the differentiation of the rotation rates of the Ap stars and affect the occurrence of non-radial pulsation in some of them are important open questions. Valuable insight can be gained into these questions by studyin
Externí odkaz:
http://arxiv.org/abs/2002.11689
Autor:
Landstreet, John D., Bagnulo, Stefano
We report the discovery of a new magnetic DA white dwarf (WD), WD0011-721, which is located within the very important 20pc volume-limited sample of the closest WDs to the Sun. This star has a mean field modulus <|B|> of 343 kG, and from the polarisat
Externí odkaz:
http://arxiv.org/abs/1907.01626
Autor:
Bagnulo, Stefano, Landstreet, John D.
Some of the white dwarfs exhibit among the strongest magnetic fields in the universe. Many of these degenerate magnetic stars are also rotating very slowly. Among these objects, Grw+70$^\circ$\,8247, with its century-long suspected rotation period an
Externí odkaz:
http://arxiv.org/abs/1904.08327
Autor:
Manser, Christopher J., Gänsicke, Boris T., Eggl, Siegfried, Hollands, Mark, Izquierdo, Paula, Koester, Detlev, Landstreet, John D., Lyra, Wladimir, Marsh, Thomas R., Meru, Farzana, Mustill, Alexander J., Rodríguez-Gil, Pablo, Toloza, Odette, Veras, Dimitri, Wilson, David J., Burleigh, Matthew R., Davies, Melvyn B., Farihi, Jay, Fusillo, Nicola Gentile, de Martino, Domitilla, Parsons, Steven G., Quirrenbach, Andreas, Raddi, Roberto, Reffert, Sabine, Del Santo, Melania, Schreiber, Matthias R., Silvotti, Roberto, Toonen, Silvia, Villaver, Eva, Wyatt, Mark, Xu, Siyi, Zwart, Simon Portegies
Many white dwarf stars show signs of having accreted smaller bodies, implying that they may host planetary systems. A small number of these systems contain gaseous debris discs, visible through emission lines. We report a stable 123.4min periodic var
Externí odkaz:
http://arxiv.org/abs/1904.02163