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http://hdl.handle.net/20.500.12386/28281
Title: | A search for the presence of magnetic fields in the two supergiant fast X-ray transients, IGR J08408-4503 and IGR J11215-5952 | Authors: | Hubrig, S. SIDOLI, Lara Postnov, K. Schöller, M. Kholtygin, A. F. Järvinen, S. P. Steinbrunner, P. |
Issue Date: | 2018 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 474 | Issue: | 1 | First Page: | L27 | Abstract: | A significant fraction of high-mass X-ray binaries are supergiant fast X-ray transients (SFXTs). The prime model for the physics governing their X-ray behaviour suggests that the winds of donor OB supergiants are magnetized. To investigate if magnetic fields are indeed present in the optical counterparts of such systems, we acquired low-resolution spectropolarimetric observations of the two optically brightest SFXTs, IGR J08408-4503 and IGR J11215-5952, with the ESO FORS 2 instrument during two different observing runs. No field detection at a significance level of 3σ was achieved for IGR J08408-4503. For IGR J11215-5952, we obtain 3.2σ and 3.8σ detections (⟨B<SUB>z</SUB>⟩<SUB>hydr</SUB> = -978 ± 308 G and ⟨B<SUB>z</SUB>⟩<SUB>hydr</SUB> = 416 ± 110 G) on two different nights in 2016. These results indicate that the model involving the interaction of a magnetized stellar wind with the neutron star magnetosphere can indeed be considered to characterize the behaviour of SFXTs. We detected long-term spectral variability in IGR J11215-5952, whereas for IGR J08408-4503, we find an indication of the presence of short-term variability on a time-scale of minutes. <P /> | URI: | http://hdl.handle.net/20.500.12386/28281 | URL: | https://academic.oup.com/mnrasl/article-abstract/474/1/L27/4644842?redirectedFrom=fulltext | ISSN: | 0035-8711 | DOI: | 10.1093/mnrasl/slx187 | Bibcode ADS: | 2018MNRAS.474L..27H | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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hubrig_sidoli2018.pdf | PDF editoriale | 1.03 MB | Adobe PDF | View/Open |
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