Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.5507r&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #55.07; Bulletin of the American Astronomical Society, Vol. 25, p.1379
Astronomy and Astrophysics
Astronomy
2
Scientific paper
We present ROSAT PSPC observations of the eclipsing magnetic polar DP Leo. The highly variable X-ray light curve of DP Leo exhibits an intensity dip prior to eclipse which was not previously observed to occur. The dip is interpreted as the eclipse of the main accretion region by an accretion stream varying in impact position on the white dwarf with time. The soft X-ray spectrum is well fit by either a blackbody (kT = 24.8(+2.6}_{-8.1) eV) or a soft power law spectrum (alpha ~ 4.0). No evidence exists for accretion onto the stronger magnetic pole and severe limits are placed upon the flux from any hard bremsstrahlung component. A distance upper limit of 500 pc is obtained from the absorption in the spectral fit and a distance estimate of around 450 pc was obtained through the use of existing data. \special{psfile=robinson.ps voffset=-370 hoffset=-90 vscale=55 hscale=55 angle=0}
Cordova France A.
Robinson Craig Richard
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