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SPIN-CYCLE ECLIPSE MAPPING OF THE 71 s OSCILLATIONS IN DQ HERCULIS: REPROCESSING SITES AND THE TRUE WHITE DWARF SPIN PERIOD

2009; IOP Publishing; Volume: 693; Issue: 1 Linguagem: Inglês

10.1088/0004-637x/693/1/l16

1538-4357

R. K. Saito, R. Baptista,

Pulsars and Gravitational Waves Research

We report an eclipse-mapping analysis of the 71 s pulsation of DQ Her in the He ii λ4686 line. The observed pulse phase-dependent illumination pattern can be explained in terms of an asymmetric oblique dipole accretor model, in which X-ray beams from the accretion poles are reprocessed in two arched accretion curtains and in a vertically extended bright spot (BS) of half-thickness H = (7.4 ± 0.4) × 10−3 R☉ at the disk rim. The optical pulsation is dominated by reprocessing at the BS, indicating that the 71 s pulsation is the beat period between the white dwarf (WD) spin (Pspin = 70.8 s) and the orbital period. Our results exclude the possibility that the rotation period of the WD is 142 s.