JEM-X observations of the Be/X-ray binary EXO 2030+375

We have used data from the Joint European Monitor (JEM-X) to perform an X-ray spectral and timing analysis of the 42-s transient pulsar EXO 2030+375 during an X-ray outburst. X-ray pulsations are clearly detected with an average pulse period of 41:66 +- 0:05 s and an average pulse fraction of 60%. The profile of the energy spectrum did not change appreciably throughout the X-ray outburst, although the source shows a slightly softer spectrum during periastron passage in the energy range 9–25 keV. The 5–25 keV X-ray luminosity changed by a factor of 2 throughout the observations, reaching a maximum value of 3x10^36 erg s^−1. These observations allowed us to verify the in-flight instrumental properties of the JEM-X Monitor.
Bibliographic reference
MARTINEZ NUÑEZ, Silvia ; Reig Torres, Pablo ; Blay Serrano, Pedro Jose ; Kretschmar, P. ; Lund, N. ; Reglero Velasco, Victor, 2003, JEM-X observations of the Be/X-ray binary EXO 2030+375, Astronomy and Astrophysics, vol. 411, no. 1, p. L411-L414