The X-Ray Time Variability and Spectrum of Gamma-Cassiopeiae X:0053+604

Details The X-Ray Time Variability and Spectrum of Gamma-Cassiopeiae X:0053+604 The X-Ray Time Variability and Spectrum of Gamma-Cassiopeiae X:0053+604

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...275..227p&link_type=abstract

Astronomy and Astrophysics, Vol.275, NO. 1/AUG(I), P. 227, 1993

Astronomy and Astrophysics

Astrophysics

21

Stars: Individual: Γ Cas, Stars: Emission-Line Be, Stars: Neutron, X-Rays: Stars

Scientific paper

A 30 h duration EXOSAT observation made in 1985 December is used to examine the X-ray time variability and spectrum of the Be star γ Cassiopeiae (X 0053+604). We find that the X-ray lightcurve is dominated by irregular energy-independent flaring on time-scales ≳ 100 s. This flaring markedly decreases the sensitivity to any periodic signals. We find no evidence for the 6000 5 oscillations reported by Frontera et al. (1987) from an earlier EXOSAT observation. We suggest that these arise from statistical fluctuations in the red noise power. The X-ray spectrum of γ Cas can either be modeled by thermal emission from an optically thin plasma with a temperature of 12 keV, or by a cut-off power-law model with a narrow iron line at an energy of 6.67 keV.
The origin of the X-ray emission in this system remains open since its spectral and temporal properties are consistent with both an acereting neutron star and a white dwarf while its high temperature argues against a coronal mechanism.

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