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http://hdl.handle.net/20.500.12386/27536
Titolo: | Dramatic change in the boundary layer in the symbiotic recurrent nova T Coronae Borealis | Autori: | Luna, G. J. M. Mukai, K. Sokoloski, J. L. Nelson, T. Kuin, P. SEGRETO, ALBERTO CUSUMANO, GIANCARLO Jaque Arancibia, M. Nuñez, N. E. |
Data pubblicazione: | 2018 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 619 | Da pagina:: | A61 | Abstract: | A sudden increase in the rate at which material reaches the most internal part of an accretion disk, i.e., the boundary layer, can change its structure dramatically. We have witnessed such a change for the first time in the symbiotic recurrent nova T CrB. Our analysis of XMM-Newton, Swift Burst Alert Telescope (BAT)/X-Ray Telescope (XRT)/UltraViolet Optical Telescope (UVOT), and the American Association of Variable Stars Observers (AAVSO) V- and B-band data indicates that during an optical brightening event that started in early 2014 (∆V ≈ 1.5) the following occurred: (i) the hard X-ray emission as seen with BAT almost vanished; (ii) the XRT X-ray flux decreased significantly, while the optical flux remained high; (iii) the UV flux increased by at least a factor of 40 over the quiescent value; and (iv) the X-ray spectrum became much softer and a bright, new blackbody-like component appeared. We suggest that the optical brightening event, which could be a similar event to that observed about 8 years before the most recent thermonuclear outburst in 1946, is due to a disk instability. | URI: | http://hdl.handle.net/20.500.12386/27536 | URL: | https://www.aanda.org/articles/aa/abs/2018/11/aa33747-18/aa33747-18.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201833747 | Bibcode ADS: | 2018A&A...619A..61L | Fulltext: | open |
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