Multiwavelength observations revealing the outbursts of the two soft X-ray transients XTE J1859+226 and XTE J1118+480
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https://hdl.handle.net/10037/2035Date
2001-02-06Type
Conference objectKonferansebidrag
Author
Solheim, Jan Erik; Chaty, S.; Haswell, C.A.; Østensen, R.; Hynes, R.I.; Shrader, C.R.; Cui, W.; Mauche, C.W.; Norton, A.J.; Geballe, T.R.; Ioannou, Z.; King, A.R.Abstract
We report here on multiwavelength observations of
the two new soft X-ray transients (SXTs) XTE
J1859+226 and XTE J1118+480, which we observed
with HST/RXTE/UKIRT. For XTE J1118+480 we
also used EUVE since it is located at a very high
galactic latitude and suffers from very low extinction.
The two sources exhibited very different behaviour.
XTE J1859+226 seems quite normal and therefore a
good object for testing the accretion mechanisms in
place during the outbursts, XTE J1118+480 is much
more unusual because it exhibits i) a low X-ray to
optical ratio and ii) a strong non-thermal contribution
in the radio to optical domain, which is likely to
be due to synchrotron emission. We concentrate here
on the near-infrared (NIR) and optical observations
of these two systems.
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