Supersoft X-Ray Source CAL 83: A Possible AE Aqr-like System
CAL83 is a close binary supersoft X-ray source in the Large Magellanic Cloud. A ~67 s periodicity detected in supersoft X-rays is most probably associated with the spin period of a highly spun-up white dwarf (WD). The variability in the period is ascribed to the obscuration of the WD by the hydrogen...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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CTU Central Library
2015-02-01
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| Series: | Acta Polytechnica CTU Proceedings |
| Online Access: | https://ojs.cvut.cz/ojs/index.php/APP/article/view/2844 |
| _version_ | 1818205987024142336 |
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| author | A. Odendaal P. J. Meintjes P. A. Charles A. F. Rajoelimanana |
| author_facet | A. Odendaal P. J. Meintjes P. A. Charles A. F. Rajoelimanana |
| author_sort | A. Odendaal |
| collection | DOAJ |
| description | CAL83 is a close binary supersoft X-ray source in the Large Magellanic Cloud. A ~67 s periodicity detected in supersoft X-rays is most probably associated with the spin period of a highly spun-up white dwarf (WD). The variability in the period is ascribed to the obscuration of the WD by the hydrogen burning envelope surrounding it, rotating with a period that is close to, but not quite synchronized with, the WD rotation period. Optical spectra obtained with SALT exhibit accretion disc emission lines with broad wing structures and P Cyg profiles, indicating mass outflows. Timing analysis of photometrical observations performed at the South African Astronomical Observatory (SAAO) revealed variable signals at ≤1 mHz which are thought to be associated with quasi-periodic oscillations from an accretion disc. The short spin period inferred for CAL83 can be the result of spin-up by accretion disc torques during a long mass transfer history, placing this source on a similar evolutionary track as the cataclysmic variable AE Aqr. |
| first_indexed | 2024-12-12T04:05:51Z |
| format | Article |
| id | doaj.art-3286d567e296465694f1eeaea2aa424e |
| institution | Directory Open Access Journal |
| issn | 2336-5382 |
| language | English |
| last_indexed | 2024-12-12T04:05:51Z |
| publishDate | 2015-02-01 |
| publisher | CTU Central Library |
| record_format | Article |
| series | Acta Polytechnica CTU Proceedings |
| spelling | doaj.art-3286d567e296465694f1eeaea2aa424e2022-12-22T00:38:46ZengCTU Central LibraryActa Polytechnica CTU Proceedings2336-53822015-02-0121949810.14311/APP.2015.02.00942612Supersoft X-Ray Source CAL 83: A Possible AE Aqr-like SystemA. Odendaal0P. J. Meintjes1P. A. Charles2A. F. Rajoelimanana3Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South AfricaDepartment of Physics, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South AfricaSchool of Physics and Astronomy, Southampton University, Southampton SO17 1BJDepartment of Physics, North-West University, Private Bag X2046, Mmabatho 2735, South AfricaCAL83 is a close binary supersoft X-ray source in the Large Magellanic Cloud. A ~67 s periodicity detected in supersoft X-rays is most probably associated with the spin period of a highly spun-up white dwarf (WD). The variability in the period is ascribed to the obscuration of the WD by the hydrogen burning envelope surrounding it, rotating with a period that is close to, but not quite synchronized with, the WD rotation period. Optical spectra obtained with SALT exhibit accretion disc emission lines with broad wing structures and P Cyg profiles, indicating mass outflows. Timing analysis of photometrical observations performed at the South African Astronomical Observatory (SAAO) revealed variable signals at ≤1 mHz which are thought to be associated with quasi-periodic oscillations from an accretion disc. The short spin period inferred for CAL83 can be the result of spin-up by accretion disc torques during a long mass transfer history, placing this source on a similar evolutionary track as the cataclysmic variable AE Aqr.https://ojs.cvut.cz/ojs/index.php/APP/article/view/2844 |
| spellingShingle | A. Odendaal P. J. Meintjes P. A. Charles A. F. Rajoelimanana Supersoft X-Ray Source CAL 83: A Possible AE Aqr-like System Acta Polytechnica CTU Proceedings |
| title | Supersoft X-Ray Source CAL 83: A Possible AE Aqr-like System |
| title_full | Supersoft X-Ray Source CAL 83: A Possible AE Aqr-like System |
| title_fullStr | Supersoft X-Ray Source CAL 83: A Possible AE Aqr-like System |
| title_full_unstemmed | Supersoft X-Ray Source CAL 83: A Possible AE Aqr-like System |
| title_short | Supersoft X-Ray Source CAL 83: A Possible AE Aqr-like System |
| title_sort | supersoft x ray source cal 83 a possible ae aqr like system |
| url | https://ojs.cvut.cz/ojs/index.php/APP/article/view/2844 |
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