TESS observations of the asynchronous polar CD Ind: mapping the changing accretion geometry
David A. H. Buckley; Graham Wynn; Gavin Ramsay; Pasi Hakala; Andrew Beardmore; Stephen B. Potter
TESS observations of the asynchronous polar CD Ind: mapping the changing accretion geometry
David A. H. Buckley
Graham Wynn
Gavin Ramsay
Pasi Hakala
Andrew Beardmore
Stephen B. Potter
OXFORD UNIV PRESS
Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2021042823109
https://urn.fi/URN:NBN:fi-fe2021042823109
Tiivistelmä
We present the results of near continuous TESS optical observations of the asynchronous polar CD Ind (RX J2115-5840). The 27.9 d long light curve, with 2 min resolution, reveals remarkable changes in the magnetic accretion geometry of the system over the 7.3 d beat period. We have modelled the changes in the optical spin period pulse shape using a cyclotron emission mapping technique. The resulting cyclotron emission maps of the magnetic white dwarf reveal how the accretion geometry changes from single- to two-pole accretion and back over the beat cycle. Finally, we present the results from particle-based numerical magnetic accretion simulations, which agree with our interpretation of the changing accretion scenario.
Kokoelmat
- Rinnakkaistallenteet [19207]