Kafka, S. and Tappert, C. and Ribeiro, T. and Honeycutt, R. K. and Hoard, D. W. and Saar, S. (2010) Low-state Magnetic Structures in Polars: Nature or Nurture? Astrophysical Journal, 721 (2). pp. 1714-1724. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20101022-142644101
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We present an orbit-resolved study of the magnetic cataclysmic variable (MCV) BL Hyi in its low state, and we explore the origin of its Hα emission line components, their properties, and their possible formation mechanism. We tentatively associate one of the line components with a high-velocity component also seen in the high state. We propose a scenario in which streaming prominence-like magnetic loops (super-prominences) are kept in place by magnetic field interactions between the white dwarf and the donor star and are responsible for the high-velocity line components in the Balmer lines. We also discuss how this is in accord with the standard scenario of the secular evolution for MCVs. Finally, we offer an observational test of our ideas and present challenges for future theoretical studies.
|Additional Information:||© 2010 The American Astronomical Society. Received 2010 March 8; accepted 2010 July 17; published 2010 September 14.|
|Subject Keywords:||novae, cataclysmic variables – stars: individual (BL Hyi, AM Her, ST LMi, VV Pup, EF Eri) – stars: magnetic field|
|Classification Code:||PACS: 97.30.Qt; 97.20.Rp; 97.10.Ld; 95.30.Ky; 97.20.Jg|
|Official Citation:||S. Kafka et al 2010 ApJ 721 1714. doi: 10.1088/0004-637X/721/2/1714|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||12 Nov 2010 00:20|
|Last Modified:||26 Dec 2012 12:32|
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