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TTM Observations of X1755-338

Published online by Cambridge University Press:  12 April 2016

H.C. Pan ,
G.K. Skinner ,
R.A. Sunyaev  and
K.N. Borozdin
H.C. Pan
Affiliation:
School of Physics and Space Research, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK Department of Physics (Theoretical Physics), University of Oxford, 1 Keble Road, Oxford OX1 3NP, UK
G.K. Skinner
Affiliation:
School of Physics and Space Research, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
R.A. Sunyaev
Affiliation:
IKI, Space Research Institute, Profsoyuznaya, 84/32, Moscow 117296, Russia
K.N. Borozdin
Affiliation:
IKI, Space Research Institute, Profsoyuznaya, 84/32, Moscow 117296, Russia

Extract

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X1755-338 is an X-ray binary source which displays X-ray dips with a 4.4 hour period (White et al. 1984). It was previously noted as an unusually soft X-ray source by Jones (1977) and was suggested later as a black-hole candidate (BHC) by White & Marshall (1984), and White et al. (1984), based on the similarity of its location in an X-ray colour-colour diagram to that of a group of BHCs.

The TTM is a coded-mask imaging spectrometer on board the KVANT module of the MIR space station. It is capable of producing images in the 2 – 30 keV band with an energy resolution of about 18% at 6 keV. The instrumental details are given in Brinkman et al. (1985).

We observed X1755-338 in 1989 March-September during the period of the TTM Galactic Centre Survey.

Type
High-Energy Transients
Information
International Astronomical Union Colloquium , Volume 151: Flares and Flashes , 1995 , pp. 334 - 335
Copyright
Copyright © Springer-Verlag 1995

References

Brinkman, A.C., Dam, J., Mels, W.A., Skinner, G.K., Willmore, P.W., 1985, in Non-thermal and Very High Temperature Phenomena in X-Ray Astronomy, Perola, G.C. & Salvati, M. (eds), Università “La Sapienza”, Roma, p. 263 Google Scholar
Jones, C., 1977, ApJ 214, 856 Google Scholar
Mitsuda, K. et al. 1984, PASJ 36, 741 Google Scholar
White, N.E., Marshall, F.E., 1984, ApJ 281, 354 Google Scholar
White, N.E. et al. 1984, ApJ 283, L9 Google Scholar