A deep X-ray low state of AM Herculis

Details A deep X-ray low state of AM Herculis A deep X-ray low state of AM Herculis

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...333l..31d&link_type=abstract

Astronomy and Astrophysics, v.333, p.L31-L34 (1998)

Astronomy and Astrophysics

Astrophysics

26

Accretion, Binaries: Close, Stars, Individual: Amher, X-Rays: Stars

Scientific paper

We present a BeppoSAX observation of AMHer during a prolonged low state. The source was observed for ~ 4hrs at a flux level comparable to previous low states, followed by a rapid ( ~ 40min) drop by a factor of ~ 7 to the deepest X-ray low state ever detected. While the active phase X-ray flux is likely to be accretion induced, coronal emission from the secondary may contribute significantly during the inactive phase. The timescale of this dramatic change in the accretion rate is of the order of the dynamical timescale of the secondary star; no available model can satisfactorily explain the evolution of the X-ray flux detected in these BeppoSAX data.

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