1H0551 - 819: Discovery of a new cataclysmic variable from the HEAO-1 Survey

Details 1H0551 - 819: Discovery of a new cataclysmic variable from the HEAO-1 Survey 1H0551 - 819: Discovery of a new cataclysmic variable from the HEAO-1 Survey

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.265..926b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 265, p. 926

Astronomy and Astrophysics

Astronomy

15

Sky Surveys (Astronomy), Cataclysmic Variables, X Ray Sources, Stellar Spectra, Light Curve, Astronomical Photometry, Radial Velocity, Emission Spectra

Scientific paper

We report the discovery of a cataclysmic variable that was detected as an X-ray source by the HEAO-1 modulation collimator. The spectrum is typical of a weaklined novalike system, with moderately strong He II 4686-A emission and a very blue continuum. Extensive photometric observations (about 94 h in total) from 1989 February to 1990 March reveal the presence of a 3.34-h quasi-sinusoidal, 5-percent modulation. We confirm with a radial velocity study that this variation occurs at, or very near to, the orbital period. Furthermore, the relative phasing of the photometry and emission-line velocities, and the light curve structure, points to a similar origin to that proposed for several other X-ray-selected CVs (e.g., AO Psc and FO Aqr), namely, an X-ray-illuminated disk bright-spot. This and other circumstantial evidence suggest that 1H0551-819 may be an intermediate polar. On suborbital time-scales, all of the light curves are dominated by incoherent flickering, with occasional enhancements of power at periods in the region of 600-2400 s. The short coherence, but with significant amplitude, points to a QPO-like interpretation. The usual optical signature of an intermediate polar, namely, a strong and coherent optical variation at the spin or sideband period, is lacking in 1H0551 - 819.

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