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18 papers · 1 filter
The rotation speed of the companion star in V395 Car (=2S0921--630)
T. Shahbaz, E. Kuulkers, P. A. Charles +3
We have obtained high resolution optical spectroscopy of the accretion disc corona source 2S0921--630 (=V395 Car) that constrains the spectral type of the companion star to be most…
The absolute magnitude of K0V stars from HIPPARCOS parallaxes
R. D. Oudmaijer, M. A. T. Groenewegen, H. Schrijver
We investigate the properties of K0V stars with Hipparcos parallaxes and spectral types taken from the Michigan Spectral Survey. The sample of 200 objects allows the empirical inve…
Properties of Hot Stars in the Wolf-Rayet galaxy NGC5253 from ISO Spectroscopy
Paul A. Crowther, S. C. Beck, Allan J. Willis +3
ISO-SWS spectroscopy of the WR galaxy NGC5253 is presented, and analysed to provide estimates of its hot young star population. Our approach differs from previous investigations in…
Gamma Radiation from PSR B1055-52
D. J. Thompson
The telescopes on the Compton Gamma Ray Observatory (CGRO) have observed PSR B1055-52 a number of times between 1991 and 1998. From these data, a more detailed picture of the gamma…
The enhancement and decrement of the Sunyaev-Zeldovich effect towards the ROSAT Cluster RXJ0658-5557
P. Andreani, H. Boehringer, G. Dall'Oglio +9
We report simultaneous observations at 1.2 and 2 mm, with a double channel photometer on the SEST Telescope, of the X-ray cluster RXJ0658-5557 in search for the Sunyaev-Zel'dovich…
X-ray bursts from 1RXS J170930.2-263927 = XTE J1709-267
M. Cocchi, A. Bazzano, L. Natalucci +5
We report evidence of type-I X-ray bursting activity from the transient 1RXS J170930.2-263927 when it was in outburst early 1997. This identifies the source as a probable low-mass…