Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984xras.rept...25p&link_type=abstract
In its Contrib. of the X-Ray Astron. Group p 25-30 (SEE N85-20952 11-89)
Astronomy and Astrophysics
Astronomy
Binary Stars, Pulsars, Stellar Spectra, X Ray Sources, Accretion Disks, Exosat Satellite, Optical Emission Spectroscopy, X Ray Spectra
Scientific paper
The 805 sec pulsing X-ray source H2252-035 was observed for 7 hr on September 14/15 and on September 17, 1983 in X-ray by EXOSAT. For part of the time on both observations simultaneous photometry at a 90 cm optical telescope was obtained. The 805 sec sinusoidal X-ray variation is clearly detected in the 2.3 to 7.9 keV range as a stable feature showing spectral hardening during pulse minimum and being well phase locked. In the optical 805 sec light curve, however, there is a 180 deg phase shift between the 2 nights. Reduced X-ray intensity is seen at the minimum of the optical data with an indication of a phase shift between the nights in the opposite direction to the shift of the optical maximum. The X-ray orbital modulation may be due to partial eclipse of the X-ray emitting hot spot on the white dwarf by a bulge at the outer edge of the accretion disk.
Kendziorra Eckhard
Pakull Manfred
Paradijs Jan van
Pietsch Wolfgang
Tjemkes Stephen
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