E2003 + 225 - A 3h 42m AM Herculis type binary system

Details E2003 + 225 - A 3h 42m AM Herculis type binary system E2003 + 225 - A 3h 42m AM Herculis type binary system

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277..682n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 277, Feb. 15, 1984, p. 682-691. Research supported by the Lockheed Independ

Astronomy and Astrophysics

Astrophysics

36

Binary Stars, Emission Spectra, Polarization Characteristics, Stellar Spectrophotometry, X Ray Sources, Abundance, Circular Polarization, Cyclotron Radiation, Heao 1, Linear Polarization, Polarimeters, Stellar Rotation, Visible Spectrum

Scientific paper

The bright soft X-ray source E2003 + 225, originally discovered by the HEAO 1 low-energy detectors, has been found to be a new AM Herculis type binary. The optical counterpart shows a rich emission spectrum of He II, He I, and H as well as circular and linear polarization. Larger polarization in the near-infrared than in the ultraviolet argues for its origin as high harmonic cyclotron emission. Optical photometry, polarimetry, spectroscopy, and the X-ray light curves are all consistent with an orbital period of 222.51 m, the longest period known for AM Herculis systems, and only the second on the long side of the 2-3 hour cataclysmic variable period gap.

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