A Preliminary BeppoSAX Study of the (Bright) Atoll Source GX 9+1

Details A Preliminary BeppoSAX Study of the (Bright) Atoll Source GX 9+1 A Preliminary BeppoSAX Study of the (Bright) Atoll Source GX 9+1

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003chjas...3..367i&link_type=abstract

Chinese Journal of Astronomy & Astrophysics, Vol. 3, Supplement, p. 367-372

Astronomy and Astrophysics

Astrophysics

Accretion Discs, Stars: Individual: Gx 9+1, Stars: Neutron Stars, X-Ray: Stars, X-Ray: Spectrum, X-Ray: General

Scientific paper

We report the preliminary results of a 350 ks BeppoSAX observation of the bright atoll source GX 9+1. In the field of view of the MECS instrument we discovered a X-ray pulsar, designated SAX J1802.7-2017, at an angular distance from GX 9+1 of ˜ 22'. Since the X-ray emission of SAX J1802.7-2017 contaminates the energy spectrum above 10 keV we studied the energy spectrum of GX 9+1 in the energy band 0.1-10 keV. We selected four regions in the color-color diagram and extracted one spectrum from each region. A bump below 1 keV is present in the spectra using a model composed by a Comptonized component absorbed by neutral matter having an equivalent hydrogen column of 1.5 × 1022 cm-2. The bump disappears adding an overabundance of iron and nickel of 7 and 70 with respect to the solar iron abundance and to the solar nickel abundance, moreover the equivalent hydrogen column becomes 0.5 × 1022 cm-2 suggesting a possible distance to the source of 4.5 kpc, implying a luminosity of 4 × 1037 erg s-1 and that the bright atoll source GX 9+1 is not bright but it is a typical atoll source.

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