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Medientyp:
E-Artikel
Titel:
Angle-action variables for orbits trapped at a Lindblad resonance
Beteiligte:
Binney, James
Erschienen:
Oxford University Press (OUP), 2020
Erschienen in:
Monthly Notices of the Royal Astronomical Society, 495 (2020) 1, Seite 886-894
Sprache:
Englisch
DOI:
10.1093/mnras/staa092
ISSN:
0035-8711;
1365-2966
Entstehung:
Anmerkungen:
Beschreibung:
<jats:title>ABSTRACT</jats:title>
<jats:p>The conventional approach to orbit trapping at Lindblad resonances via a pendulum equation fails when the parent of the trapped orbits is too circular. The problem is explained and resolved in the context of the Torus Mapper and a realistic Galaxy model. Tori are computed for orbits trapped at both the inner and outer Lindblad resonances of our Galaxy. At the outer Lindblad resonance, orbits are quasi-periodic and can be accurately fitted by torus mapping. At the inner Lindblad resonance, orbits are significantly chaotic although far from ergodic, and each orbit explores a small range of tori obtained by torus mapping.</jats:p>