Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-02-06
Astronomy and Astrophysics
Astrophysics
4 pages, 6 figures, conference, Proceedings of the 4th INTEGRAL Workshop (Alicante 2000), to be published in ESA-SP (2001)
Scientific paper
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.
Chaty Sylvain
Cui Wei-Wei
Geballe Thomas Ronald
Haswell Carole A.
Hynes Robert I.
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