Constraining the spectral parameters of RXJ0925.7-4758 with the BeppoSAX LECS

Details Constraining the spectral parameters of RXJ0925.7-4758 with the BeppoSAX LECS Constraining the spectral parameters of RXJ0925.7-4758 with the BeppoSAX LECS

1999-03-16

arxiv.org/abs/astro-ph/9903243v1

Astronomy and Astrophysics

Astrophysics

9 pages, 7 figures. Accepted for publication in A&A main journal

Scientific paper

The Super Soft Source RX J0925.7--4758 was observed by BeppoSAX LECS and MECS on January 25--26 1997. The source was clearly detected by the LECS but only marginally detected by the MECS. We apply detailed Non-Local Thermodynamic Equilibrium (Non-LTE) models including metal line opacities to the observed LECS spectrum. We test whether the X-ray spectrum of RX J0925 is consistent with that of a white dwarf and put constraints upon the effective temperature and surface gravity by considering the presence or absence of spectral features such as absorption edges and line blends in the models and the observed spectrum. We find that models with effective temperatures above ~1e6 K or below \~7.5e5 K can be excluded. If we assume a single model component for RX J0925 we observe a significant discrepancy between the model and the data above the NeIX edge energy at 1.19 keV. This is consistent with earlier observations with ROSAT and ASCA. The only way to account for the emission above ~1.2 keV is by introducing a second spectral (plasma) component. This plasma component may be explained by a shocked wind originating from the compact object or from the irradiated companion star. If we assume log g = 9 then the derived luminosity is consistent with that of a nuclear burning white dwarf at a distance of ~4 kpc.

Affiliated with

Also associated with

No associations

Rating

Constraining the spectral parameters of RXJ0925.7-4758 with the BeppoSAX LECS does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Constraining the spectral parameters of RXJ0925.7-4758 with the BeppoSAX LECS, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Constraining the spectral parameters of RXJ0925.7-4758 with the BeppoSAX LECS will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-538215