Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315l.123o&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 315, April 15, 1987, p. L123-L127. Research support
Astronomy and Astrophysics
Astrophysics
38
Binary Stars, Hercules Nova, Light (Visible Radiation), Light Curve, Ultraviolet Radiation, X Ray Sources, Black Body Radiation, High Resolution, Linear Polarization, Luminous Intensity
Scientific paper
Exosat observations of the AM Her object E2003 + 225 made in June and September 1985, are presented together with optical and ultraviolet observations. The averages of soft X-ray count rate doubled between October 1983 and June 1985; the simultaneously measured V band intensity fell by a factor of 3 and the UV flux by 20 percent. The medium-energy X-ray flux did not increase significantly. In September 1985, E2003 + 225 was observed to have a radically different soft X-ray light curve from that seen previously, but an average intensity similar to that of June 1985. The new soft X-ray light curve showed two similar peaks and two unequal minima separated by half a period. The optical light curve observed 2 days earlier showed no major change in shape. These observations provide a serious challenge to the standard model of AM Her objects.
Beuermann Klaus
Charles Philip
Maraschi Laura
Mukai Koji
Osborne Julian Paul
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