Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..apr.e1502b&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, April 18-21, 1997, abstract #E15.02
Astronomy and Astrophysics
Astrophysics
Scientific paper
A search for reprocessed X-rays causing UV pulsations in the binary companions of X-ray pulsars was carried out in a 200 Åwide bandpass centered at 1450 Åusing the High Speed Photometer on the Hubble Space Telescope. A positive detection of reprocessed X-rays occurred in the 4U0900-40/HD77581 system. We find evidence in archival International Ultraviolet Explorer spectra that the UV radiation from HD77581 is emitted primarily in resonance lines in the companion star's outer atmosphere. Reprocessed UV pulses have also been detected in these lines by Boroson et al. (Astrophys. J., 465, 940, 1996) using the Faint Object Spectrograph on HST. The existence of two different pulse frequencies (UV and X-ray) in an X-ray binary system makes it dynamically equivalent to a double-lined spectroscopic binary. The mass of the neutron star can be derived from the orbital phase dependence of the two frequencies.
Boyd Patricia
Dolan Joseph
Hill Robert J.
Percival Jeffrey
Silvis Jeffrey
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