The 67-min X-ray period of EX Hydrae observed with the Einstein observatory

Details The 67-min X-ray period of EX Hydrae observed with the Einstein observatory The 67-min X-ray period of EX Hydrae observed with the Einstein observatory

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183...73h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 1, Sept. 1987, p. 73-82.

Astronomy and Astrophysics

Astronomy

6

Accretion Disks, Cataclysmic Variables, Heao 2, Light Curve, Stellar Mass Accretion, X Ray Astronomy, Astronomical Photometry, Eclipsing Binary Stars, Novae, Visible Spectrum, White Dwarf Stars

Scientific paper

The cataclysmic variable EX Hydrae has been observed in X-rays with the high resolution imager (HRI), IPC, and monitor proportional counter (MPC) of the Einstein observatory on two occasions. The X-ray spectra indicate multiple spectral components. A constant hard X-ray flux is found in the high-energy channels of the MPC. In the lower energy channels of the MPC and in the IPC a variable softer component is observed with a period of 67 min. The modulation is approximately in phase with the stable 67-min modulation in the optical brightness. The IPC X-ray spectrum changes slightly with the 67 min phase. The X-ray observations of EX Hya, recently interpreted as an intermediate polar, exhibit many features characteristic of AM Her-type stars. The constant hard X-ray source, e.g., is expected from an AM Her-type star with suitable orientation of the magnetic axis with respect to the inclination angle. The AM Her-type X-ray properties of EX Hya and the possible absence of a standard accretion disk in the system are discussed.

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