Bibcode
Hynes, R. I.; Haswell, C. A.; Casares, J.; Zurita, C.
Referencia bibliográfica
Nuclear Physics B Proceedings Supplements, Vol. 80, Proceedings of the Texas Symposium on Relativistic Astrophysics and Cosmology held in Paris, France, 14-18 December, 1998. CDROM contents., p.15/13
Advertised on:
1
2000
Número de citas
2
Número de citas referidas
2
Descripción
We present time-resolved spectroscopy of the soft X-ray transient XTE
J2123-058 in outburst. Spectral coverage of 3700-6700A was achieved
spanning two orbits of the binary. The strongest emission lines are HeII
4686A and CIII/NIII 4640A (Bowen blend). Other weak emission lines of
HeII and CIV are present and Balmer lines show a complex structure,
possibly contaminated by HeII. HeII 4686A and CIII/NIII 4640A show
different orbital light curves indicating an origin in different
regions. HeII 4686A profiles show a complex multiple S-wave structure.
Doppler tomography reveals this emission is not associated with the
companion star, and occurs at velocities too low for Keplerian disk
material. It can possibly be associated with overflowing or splashing
stream material. The optical spectrum approximates a steep blue
power-law, consistent with emission on the Rayleigh-Jeans tail of a
black body spectrum. Orbital modulations show no wavelength dependence;
this is as expected if both disk and companion star are hot enough for
the peak of their spectral energy distributions to be in the UV. The hot
continuum and presence of high-excitation emission lines indicate strong
X-ray heating.