A Flare-induced Mass Transfer/Accretion Event in AM Her?

Details A Flare-induced Mass Transfer/Accretion Event in AM Her? A Flare-induced Mass Transfer/Accretion Event in AM Her?

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...4e..30s&link_type=abstract

The Ultraviolet Universe: Stars from Birth to Death, 26th meeting of the IAU, Joint Discussion 4, 16-17 August 2006, Prague, Cze

Computer Science

Scientific paper

We report observations of a mass transfer/accretion event in AM Her which appears to have been induced by a strong flare on the secondary. UV observations of the magnetic CV, AM Her, were made with STIS on HST towards the end of a deep photometric minimum in late 2003. Our goal was to search for evidence of magnetic activity on the secondary (as seen in the Doppler-shifted hot emission lines of C IV and Si IV), one of the fastest rotating cool stars ever studied in the UV. There was little evidence for quiescent C IV emission at the velocity of the M star secondary, placing useful limits on its steady transition region emission. One strong flare was seen in C IV (and initially, in Si IV and He II as well), with a velocity consistent with the M dwarf. This was accompanied by a near-simultaneous increase in continuum emission from the white dwarf; the excess had a temperature of about 100,000 K. We argue that this strong flare may have ejected mass in the form of CME, or disturbed a large prominence system, exciting an accretion event on the white dwarf. We discuss implications of the results for low-state CV activity, mass transfer, and cool star activity at extreme rotation rates.

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