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Astrophysics and Space Science | 1983

Enhanced X-ray emission above 50 keV in sco X-1

M. L. Duldig; J. Greenhill; K. B. Fenton; R. M. Thomas; D. J. Watts

Balloon observations of the X-ray source Sco X-1 carried out in November 1978 have revealed a thermal spectrum withkT≅7 keV in the 20–60 keV energy band. In addition, there was evidence of a high energy component, possibly variable, above ∼50 keV. The spectral form of this component could not be determined but was hard with a 60 keV flux of ∼10−4 photons (keV cm2 s)−1.


Monthly Notices of the Royal Astronomical Society | 1980

The K dwarfs associated with the X-ray transients A0620–00 and A1742–28

Paul Murdin; David A. Allen; Donald C. Morton; John A. J. Whelan; R. M. Thomas


Monthly Notices of the Royal Astronomical Society | 1979

Radio identifications of 11 X-ray sources at 2 cm

M. L. Duldig; J. Greenhill; R. M. Thomas; R. F. Haynes; L. W. Simons; Paul Murdin


Monthly Notices of the Royal Astronomical Society | 1979

Optical identification of SMC X-2

Paul Murdin; Donald C. Morton; R. M. Thomas


Monthly Notices of the Royal Astronomical Society | 1979

O I λ 7773 absorption in optical counterparts of X-ray sources

R. M. Thomas; Donald C. Morton; Paul Murdin


Monthly Notices of the Royal Astronomical Society | 1978

Flare observations of Circinus X-1 at 2-cm wavelength

R. M. Thomas; M. L. Duldig; R. F. Haynes; Paul Murdin


Monthly Notices of the Royal Astronomical Society | 1979

Simultaneous radio and X-ray observations of the X-ray burst source MXB 1636 – 53

R. M. Thomas; M. L. Duldig; R. F. Haynes; L. W. Simons; Paul Murdin; J. A. Hoffman; W. H. G. Lewin; Wm. A. Wheaton; J. Doty


Monthly Notices of the Royal Astronomical Society | 1979

High-resolution map of G 339.6 – 0.1 and its possible association with 4U 1642 – 45

R. F. Haynes; Paul Murdin; R. M. Thomas; M. L. Duldig; J. Greenhill


Monthly Notices of the Royal Astronomical Society | 1980

Observations of the LMC X-1 region (MC76 and 77) at 2 cm

M. L. Duldig; R. M. Thomas; J. Greenhill; R. F. Haynes; Paul Murdin


Monthly Notices of the Royal Astronomical Society | 1980

Emission line variability in the optical candidate for 2A0526 – 328

D. J. Watts; J. Greenhill; R. M. Thomas

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Paul Murdin

University of Cambridge

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R. F. Haynes

Commonwealth Scientific and Industrial Research Organisation

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D. J. Watts

University of Tasmania

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L. W. Simons

Commonwealth Scientific and Industrial Research Organisation

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J. A. Hoffman

Massachusetts Institute of Technology

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J. Doty

Massachusetts Institute of Technology

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