English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

A significant fraction of high-mass X-ray binaries are supergiant fast X-raytransients (SFXTs). The prime model for the physics governing their X-raybehaviour suggests that the winds of donor OB supergiants are magnetized. Toinvestigate if magnetic fields are indeed present in the optical counterpartsof such systems, we acquired low-resolution spectropolarimetric observations ofthe two optically brightest SFXTs, IGR J08408-4503 and IGR J11215-5952 with theESO FORS2 instrument during two different observing runs. No field detection ata significance level of 3sigma was achieved for IGR J08408-4503. For IGRJ11215-5952, we obtain 3.2sigma and 3.8sigma detections (<B_z>_hydr =-978+-308G and <B_z>_hydr = 416+-110G) on two different nights in 2016. Theseresults indicate that the model involving the interaction of a magnetizedstellar wind with the neutron star magnetosphere can indeed be considered tocharacterize the behaviour of SFXTs. We detected long-term spectral variabilityin IGR J11215-5952, while for IGR J08408-4503 we find an indication of thepresence of short-term variability on a time scale of minutes.

A search for the presence of magnetic fields in the two Supergiant Fast X-ray Transients IGR J08408-4503 and IGR J11215-5952