EDP Sciences
Special letters issue on: first science with integral
Free Access
Issue
A&A
Volume 411, Number 1, November III 2003
Special letters issue on: first science with integral
Page(s) L411 - L414
Section Letters
DOI https://doi.org/10.1051/0004-6361:20031205


A&A 411, L411-L414 (2003)
DOI: 10.1051/0004-6361:20031205

Letter

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

S. Martínez Núñez1, P. Reig1, P. Blay1, P. Kretschmar2, 3, N. Lund4 and V. Reglero1

1  GACE, Instituto de Ciencias de los Materiales, Universidad de Valencia, PO Box 20085, 46071 Valencia, Spain
2  Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85748 Garching, Germany
3  INTEGRAL Science Data Centre, Chemin d'Écogia 16, 1290 Versoix, Switzerland
4  Danish Space Research Institute, Juliane Maries Vej 30, 2100, Copenhagen, Denmark

(Received 7 July 2003 / Accepted 1 August 2003)

Abstract
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 $41.66\pm0.05$ 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 $3 \times 10^{36}$ erg s -1. These observations allowed us to verify the in-flight instrumental properties of the JEM-X Monitor.


Key words: INTEGRAL -- JEM-X -- BeX stars -- HMXRBs -- EXO 2030+375

Offprint request: S. Martínez Núñez, silvia.martinez@uv.es

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