Discovery of a new X-ray emitting dwarf nova 1E 0643.0-1648

Details Discovery of a new X-ray emitting dwarf nova 1E 0643.0-1648 Discovery of a new X-ray emitting dwarf nova 1E 0643.0-1648

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247l..35c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 247, July 1, 1981, p. L35-L38. Research supported by the Fundacao de

Astronomy and Astrophysics

Astrophysics

35

Binary Stars, Dwarf Novae, Novae, X Ray Sources, X Ray Spectra, Light (Visible Radiation), Magnetic Fields, Stellar Luminosity, Stellar Spectra, Stellar Temperature

Scientific paper

A variable, hard X-ray source has been discovered with the Einstein Observatory and identified on Harvard archive plates with a bright (10-13 mag) uncataloged variable star 9 arcmin south of Sirius. The X-ray emission exhibits high and low states. Recent optical monitoring shows that outbursts similar to those of dwarf novae occur at intervals of about 15 days. X-ray and optical variability on time scales of 1-10 minutes is seen. The spectroscopic and photometric properties of this star are characteristic of dwarf novae. There is some evidence, both from the spectral features and weak circular polarization observed during a low state, for a magnetic field of the order of 10-million gauss.

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