Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.212..447c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 212, Jan. 15, 1985, p. 447-461. Research supported by t
Astronomy and Astrophysics
Astronomy
56
Exosat Satellite, Stellar Spectra, X Ray Sources, X Ray Stars, Binary Stars, Cataclysmic Variables, Light Curve, Power Spectra, Time Series Analysis, X Ray Spectra
Scientific paper
During a continuous 26 hour X-ray observation of the 98-min binary EX Hydrae using the CMA detector on EXOSAT, a 67-min modulation was detected with a pulse-fraction of about 30 per cent. The phase of the modulation coincides with that of the 67-min optical modulation which has a pulse-fraction of 15 per cent. The X-ray and optical pulse shapes are similar. A modulation with a period of 98 min is also found in a power spectral analysis of the EXOSAT data. This variation has an amplitude half that of the 67-min X-ray modulation. An analysis of extensive optical data reveals that, in addition to the 67-min variation, there are two optical modulations with pulsed fractions of 5 per cent: one at half the orbital period, or 49.1 min, and one at 46.4 min. A moderate resolution (λ/Δλ ≡ 10 - 50) soft X-ray spectrum of EX Hydrae in the energy range 0.04 - 2 keV was also obtained during the observation through the use of an objective transmission grating.
Cordova France A.
Kahn Steve M.
Mason Keith O.
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