X-Ray Observations of VY Scl-Type Nova-Like Binaries in the High and Low State
Four VY Scl-type nova-like systems were observed in X-rays both during the low and the high optical states. They are BZ Cam, MV Lyr, TT Ari, and V794 Aql. Using archival ROSAT, <em>Swift</em> and <em>SUZAKU</em> observations we found that the X-ray flux for BZ Cam is higher d...
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Czech Technical University in Prague
2015-02-01
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| Series: | Acta Polytechnica CTU Proceedings |
| Online Access: | https://ojs.cvut.cz/ojs/index.php/APP/article/view/2920 |
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| author | P. Zemko M. Orio |
| author_facet | P. Zemko M. Orio |
| author_sort | P. Zemko |
| collection | DOAJ |
| description | Four VY Scl-type nova-like systems were observed in X-rays both during the low and the high optical states. They are BZ Cam, MV Lyr, TT Ari, and V794 Aql. Using archival ROSAT, <em>Swift</em> and <em>SUZAKU</em> observations we found that the X-ray flux for BZ Cam is higher during the low state, but there is no supersoft X-ray source (SSS) that would indicate the thermonuclear burning predicted in a previous article. The X-ray flux is lower by a factor 2–10 in the low than the high state in other systems, and does not reflect the drop in <em>˙M</em> inferred from optical and UV data. The best fit model for the X-ray spectra is a collisionally ionized plasma model. The X-ray flux may originate in a shocked wind or in accretion onto polar caps in intermediate polar systems that continues even during the low state. |
| format | Article |
| id | doaj-art-cc3225cd07b640a099601d27096ff4fa |
| institution | Kabale University |
| issn | 2336-5382 |
| language | English |
| publishDate | 2015-02-01 |
| publisher | Czech Technical University in Prague |
| record_format | Article |
| series | Acta Polytechnica CTU Proceedings |
| spelling | doaj-art-cc3225cd07b640a099601d27096ff4fa2025-08-20T03:38:48ZengCzech Technical University in PragueActa Polytechnica CTU Proceedings2336-53822015-02-012126927210.14311/APP.2015.02.02692680X-Ray Observations of VY Scl-Type Nova-Like Binaries in the High and Low StateP. Zemko0M. Orio1Sternberg Astronomical Institute, Moscow State University, 13, Universitetskij ave., Moscow, 119991, Russia INAF - Osservatorio di Padova, vicolo dell’ Osservatorio 5, I-35122 Padova, ItalyINAF - Osservatorio di Padova, vicolo dell’ Osservatorio 5, I-35122 Padova, Italy Department of Astronomy, University of Wisconsin, 475 N. Charter Str., Madison, WI 53704, USAFour VY Scl-type nova-like systems were observed in X-rays both during the low and the high optical states. They are BZ Cam, MV Lyr, TT Ari, and V794 Aql. Using archival ROSAT, <em>Swift</em> and <em>SUZAKU</em> observations we found that the X-ray flux for BZ Cam is higher during the low state, but there is no supersoft X-ray source (SSS) that would indicate the thermonuclear burning predicted in a previous article. The X-ray flux is lower by a factor 2–10 in the low than the high state in other systems, and does not reflect the drop in <em>˙M</em> inferred from optical and UV data. The best fit model for the X-ray spectra is a collisionally ionized plasma model. The X-ray flux may originate in a shocked wind or in accretion onto polar caps in intermediate polar systems that continues even during the low state.https://ojs.cvut.cz/ojs/index.php/APP/article/view/2920 |
| spellingShingle | P. Zemko M. Orio X-Ray Observations of VY Scl-Type Nova-Like Binaries in the High and Low State Acta Polytechnica CTU Proceedings |
| title | X-Ray Observations of VY Scl-Type Nova-Like Binaries in the High and Low State |
| title_full | X-Ray Observations of VY Scl-Type Nova-Like Binaries in the High and Low State |
| title_fullStr | X-Ray Observations of VY Scl-Type Nova-Like Binaries in the High and Low State |
| title_full_unstemmed | X-Ray Observations of VY Scl-Type Nova-Like Binaries in the High and Low State |
| title_short | X-Ray Observations of VY Scl-Type Nova-Like Binaries in the High and Low State |
| title_sort | x ray observations of vy scl type nova like binaries in the high and low state |
| url | https://ojs.cvut.cz/ojs/index.php/APP/article/view/2920 |
| work_keys_str_mv | AT pzemko xrayobservationsofvyscltypenovalikebinariesinthehighandlowstate AT morio xrayobservationsofvyscltypenovalikebinariesinthehighandlowstate |