Issue |
A&A
Volume 376, Number 2, September II 2001
|
|
---|---|---|
Page(s) | 532 - 542 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20011006 | |
Published online | 15 September 2001 |
BeppoSAX observation of the eclipsing dipping X-ray binary X 1658-298
1
Astrophysics Division, Space Science Department of ESA, ESTEC, PO Box 299, 2200 AG Noordwijk, The Netherlands
2
Astronomical Institute, Utrecht University, PO Box 80 000, 3508 TA Utrecht, The Netherlands
3
Space Research Organization Netherlands, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
Corresponding author: T. Oosterbroek, toosterb@astro.estec.esa.nl
Received:
8
January
2001
Accepted:
5
July
2001
Results of a 2000 August 12-13 BeppoSAX observation of the
7.1 hr eclipsing, dipping, bursting, transient, low-mass X-ray binary (LMXRB)
X 1658-298 are presented. The spectrum outside of eclipses, dips and bursts
can be modeled by the combination of a soft disk-blackbody and a
harder Comptonized component with a small amount atom cm-2) of low-energy absorption. In contrast, an
RXTE observation 18 months earlier during the same outburst, measured
an absorption of
atom cm-2. Such a change is
consistent with a thinning of the accretion disk as the outburst
progresses. Structured residuals from the best-fit spectral model are
present which are tentatively identified with Ne-K/Fe-L and Fe-K shell
emission. The spectral changes during dips are complex and
may be modeled by a strong (~
atom cm-2)
increase in absorption of the Comptonized component only, together with
reductions in normalizations of both spectral components. This
behavior is in contrast to the "complex continuum"
model for X-ray dip sources, where the softer blackbody
component rapidly suffers strong absorption. It is however, similar to
that found during recent XMM-Newton observations of the eclipsing, dipping,
LMXRB EXO 0748-676.
An updated orbital ephemeris is provided which does not
require a quadratic term, in contrast to that of Wachter et al. ([CITE]).
Key words: accretion, accretion disks / stars: individual: X 1658-298 / stars: neutron / X-rays: stars
© ESO, 2001
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.