New soft X-ray mode in the AM Herculis object E2003 + 225

Journal Article · Wed Apr 01 04:00:00 EST 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/184873· OSTI ID:5931183

Osborne, J P; Beuermann, K; Charles, P; Mukai, K; Maraschi, L

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. 18 references.

• Research Organization: EXOSAT Observatory, Noordwijk, Netherlands; Max-Planck-Institut fuer extraterrestrische Physik, Garching, West; Oxford Univ., England; Milano, Universita, Milan, Italy
• OSTI ID: 5931183
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 315; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BINARY STARS
BLACKBODY RADIATION
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
POLARIZATION
RADIATION FLUX
RADIATIONS
SOFT X RADIATION
SPECTRA
STARS
ULTRAVIOLET RADIATION
VISIBLE SPECTRA
X RADIATION