1999/04/23 by D. J. Macomb, M. H. Finger, Mark H. Finger +4 · 5 citations
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysical Phenomena and Observations #High-pressure geophysics and materials #Pulsars and Gravitational Waves Research #astro-ph
paper · pdf · doi:10.1086/312074
17 pages, Latex, aasms, accepted for publication in ApJ Letters
arxiv created 1999/04/23 · openalex publication_date 1999/06/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
We report on the detection of pulsed, broadband, X-ray emission from the transient source RX J0117.6-7330. The pulse period of 22 s is detected by the ROSAT /PSPC instrument in a 1992 September 30-October 2 observation and by the Compton Gamma-Ray Observatory /BATSE instrument during the same epoch. Hard X-ray pulsations are detectable by BATSE for approximately 100 days surrounding the ROSAT observation (1992 August 28-December 8). The total directly measured X-ray luminosity during the ROSAT observation is 1.0 × 10 38 ( d /60 kpc) 2 ergs s -1 . The pulse frequency increases rapidly during the outburst, with a peak spin-up rate of 1.2 × 10 −10 Hz s -1 and a total frequency change of 1.8%. The pulsed percentage is 11.3% from 0.1-2.5 keV, increasing to at least 78% in the 20-70 keV band. These results establish RX J0117.6-7330 as a transient Be binary system.