Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-04-30
Astron.Astrophys. 423 (2004) 311-319
Astronomy and Astrophysics
Astrophysics
9 pages, 5 figures, 2 tables; accepted for publication on Astronomy & Astrophysics, main journal. Final version of the paper i
Scientific paper
10.1051/0004-6361:20040273
A pointed observation of the low-luminosity galactic source 4U 2206+54 was carried out in November 1998 with BeppoSAX. The light curve of 4U 2206+54 shows erratic variability on a timescale of about 1 hour; neither hardness variations nor time periodicities are detected throughout this 67 ks long observation. Thanks to the wide spectral coverage capabilities of BeppoSAX we could observe the source X-ray continuum over three energy decades, from 0.6 to 60 keV. The spectrum could be equally well fitted either with a blackbody plus Comptonization or with a high energy cutoff power law. No iron emission around 6.5 keV was detected, while a tentative detection of a cyclotron resonant feature in absorption is presented. Comparison of the present BeppoSAX data with the information available in the literature for this source suggests that 4U 2206+54 is a close binary system in which a (possibly magnetized) NS is accreting from the companion star wind.
Amati Lorenzo
Fiume Daniele Dal
Frontera Filippo
Masetti Nicola
Orlandini Mauro
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