Late evolution of cataclysmic variables: the loss of AM Her systems |
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| Institution: | 1. European Space Astronomy Centre (ESA/ESAC), Operations Department, E-28692 Villanueva de la Cañada (Madrid), Spain;2. Quasar Science Resources S.L for ESA, European Space Astronomy Centre (ESA/ESAC), Operations Department, E-28692 Villanueva de la Cañada (Madrid), Spain;3. INAF – IASF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Via A. Corti 12, I-20133 Milano, Italy;4. Department of Astronomy, ISDC, University of Geneva, Chemin d’Ecogia 16, CH-1290 Versoix, Switzerland;5. Centro de Astrobiología – Departamento de Astrofísica (CSIC-INTA), E-28692 Villanueva de la Cañada (Madrid), Spain;6. Department of Chemistry, Physics and Astronomy, Georgia College and State University, Milledgeville, GA 31061, USA;7. AIM, CEA, CNRS, Université Paris-Saclay, Université de Paris, F-91191 Gif-sur-Yvette, France;8. Université de Paris, CNRS, Astroparticule et Cosmologie, F-75006 Paris, France;9. School of Physical Sciences and CfAR, Dublin City University, Dublin 9, Ireland;10. Dublin Institute for Advanced Studies, 31 Fitzwilliam Place, Dublin 2, Ireland;11. Department of Applied Physics & Astronomy, University of Sharjah, Sharjah, UAE;12. Sharjah Academy of Astronomy, Space Sciences, and Technology (SAASST), Sharjah, UAE;13. Department of Applied Physics, University of Alicante, E-03080 Alicante, Spain;14. Sternberg Astronomical Institute, Moscow State University, 119234, Moscow, Russia;15. Kazan Federal University, Kazan, Russia;p. Institute of Astrophysics, Foundation for Research and Technology-Hellas, 71110 Heraklion, Crete, Greece;q. University of Crete, Physics Department & Institute of Theoretical & Computational Physics, 70013 Heraklion, Crete, Greece;r. Department of Physics, Systems Engineering and Signal Theory, University of Alicante, E-03690 Alicante, Spain;s. University Institute of Physics Applied to Sciences and Technologies, University of Alicante, E-03690 Alicante, Spain;t. Department of Physics and Astronomy, FI-20014 University of Turku, Finland;u. Space Research Institute of the Russian Academy of Sciences, Profsoyuznaya Str. 84/32, Moscow 117997, Russia;v. School of Physics and Astronomy, Faculty of Physical Sciences and Engineering, University of Southampton, Southampton SO17 1BJ, UK;w. Erlangen Centre for Astroparticle Physics (ECAP), Erwin-Rommel-Strasse 1, 91058 Erlangen, Germany;x. Universidad Internacional de Valencia - VIU, C/Pintor Sorolla 21, 46002, Valencia, Spain;y. Aurora Technology B.V. for ESA, European Space Astronomy Centre (ESA/ESAC), Operations Department, E-28692 Villanueva de la Cañada (Madrid), Spain;z. Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany;1. International Space Science Institute (ISSI), Hallerstrasse 6, CH-3012 Bern;2. MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;3. Dr. Karl Remeis-Sternwarte, Friedrich-Alexander-Universität Erlangen-Nürnberg, Sternwartstr. 7, D-96049 Bamberg, Germany;4. Franz-Ludwig-Gymnasium, Franz-Ludwig-Strasse 13, 96047 Bamberg;5. Deutsches Elektronen Synchrotron DESY, D-15738 Zeuthen, Germany;6. Instituto de Física de Cantabria (CSIC-Universidad de Cantabria), E-39005, Santander, Spain;7. INAF – OAS, Osservatorio di Astrofisica e Scienza dello Spazio, via Gobetti 93/3, I-40129 Bologna, Italy;8. Departamento de Ciencias Físicas, Universidad Andrés Bello, Fernández Concha 700, Las Condes, Santiago, Chile;9. South African Astronomical Observatory, Observatory Road, Observatory, 7925, Cape Town, RSA;10. Inter-University Institute for Data-Intensive Astronomy, Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa;11. IAU-Office of Astronomy for Development, P.O. Box 9, 7935 Observatory, South Africa;12. CRESST, Department of Physics, and Center for Space Science and Technology, UMBC, Baltimore, MD 21250, USA;13. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA;14. INAF – Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate, Italy;15. Center for Astrophysics and Space Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 920093-0424, USA;P. Space Sciences Laboratory, 7 Gauss Way, University of California, Berkeley, CA 94720-7450, USA;Q. Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans s/n, E-08193 Barcelona, Spain; Institut d’Estudis Espacials de Catalunya (IEEC), Gran Capitá 2-4, E-08034 Barcelona, Spain;R. Institució Catalana de Recerca i Estudis Avançats (ICREA), E-08010 Barcelona, Spain;S. ST12 Astrophysics Branch, NASA Marshall Space Flight Center, Huntsville, AL 35812, USA;T. Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Shijingshan District, 100049, Beijing, China;1. Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650216, PR China;2. Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, PR China;3. Graduate University of Chinese Academy of sciences, Beijing, PR China |
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| Abstract: | The white dwarf in AM Her systems is strongly magnetic and keeps in synchronous rotation with the orbit by magnetic coupling to the secondary star. As the latter evolves through mass loss to a cool, degenerate brown dwarf it can no longer sustain its own magnetic field and coupling is lost. Angular momentum accreted then spins up the white dwarf and the system no longer appears as an AM Her system. Possible consequences are run-away mass transfer and mass ejection from the system. Some of the unusual cataclysmic variable systems at low orbital periods may be the outcome of this evolution. |
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