H2215-086 -King of the DQ Herculis stars

Details H2215-086 -King of the DQ Herculis stars H2215-086 -King of the DQ Herculis stars

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264l..61p&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 264, Jan. 15, 1983, p. L61-L64.

Astronomy and Astrophysics

Astrophysics

44

Binary Stars, Blue Stars, Light Curve, Stellar Spectra, Variable Stars, X Ray Sources, H Lines, Magnetic Stars, Orbital Elements, Stellar Rotation, White Dwarf Stars

Scientific paper

The authors have found a previously uncataloged 13th magnitude cataclysmic variable inside the 0.7 deg2 box of the X-ray source H2215-086. The star shows strong, broad emission lines of H, He II, and He I superposed on a blue continuum. Photometry reveals large amplitude, strictly coherent variations with periods of 21 minutes and 4 hours, and a possible modulation at 23 minutes. The authors interpret the 4 hour period as the orbital period of the underlying binary, and the 21 minute period as the sidereal or synodic rotation period of a magnetized degenerate dwarf.

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