2001/10/31 by J. J. M. in 't Zand, J. Swank, R. H. D. Corbet +1 · 17 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Binary number #Binary pulsar #Luminosity #Neutron star #Orbital elements #Orbital period #Oscillation (cell signaling) #Pulsar #Pulsars and Gravitational Waves Research #Spin (aerodynamics) #astro-ph
paper · pdf · doi:10.1051/0004-6361:20011512
published in Astronomy and Astrophysics 380(1), L26-L29 (EDP Sciences) · accepted for A&A Letters, 5 pages
arxiv created 2001/10/31 · openalex publication_date 2001/12/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A search for pulsations from the Be X-ray binary SAX J2239.3+6116, through observations with the Narrow Field Instruments on BeppoSAX and the Proportional Counter Array on RXTE, yielded the clear presence of a 1247 s coherent oscillation. Given the fairly high X-ray luminosity on previous occasions (up to a few times 1036 erg s-1 in 2 to 28 keV), the oscillation must be due to the spin of a neutron star. Assuming that the 262 day recurrence time is the orbital period, SAX J2239.3+6116 has both the longest orbital period and the longest pulse period of 24 Be X-ray binaries with measured orbital periods.