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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

A search for pulsations from the Be X-ray binary SAX J2239.3+6116, throughobservations with the Narrow Field Instruments on BeppoSAX and the ProportionalCounter Array on RXTE, yielded the clear presence of a 1247 s coherentoscillation. Given the fairly high X-ray luminosity on previous occasions (upto a few times 10^36 erg/s in 2 to 28 keV), the oscillation must be due to thespin of a neutron star. Assuming that the 262 day recurrence time is theorbital period, SAX J2239.3+6116 has both the longest orbital period and thelongest pulse period of 24 Be X-ray binaries with measured orbital periods.Comment: accepted for A&A Letters, 5 page

Discovery of a 1247 s pulsar in the Be X-ray binary SAX J2239.3+6116