AK Sco: enhanced magnetic activity in a pre-main sequence interacting binary

Details AK Sco: enhanced magnetic activity in a pre-main sequence interacting binary AK Sco: enhanced magnetic activity in a pre-main sequence interacting binary

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009xmm..prop...69g&link_type=abstract

XMM-Newton Proposal ID #06518701

Astronomy and Astrophysics

Astronomy

Stars, White Dwarfs, Solar System, Ak Sco

Scientific paper

AK Sco is a unique source: a ~10 Myr old pre-main-sequence (PMS) spectroscopic binary composed of two nearly equal F5 stars that at periastron are separated by barely 11 stellar radii. The orbit is not yet circularized (e = 0.47) and very strong tides are expected. Previous high resolution UV spectroscopic observations carried out with the HST/STIS have shown that there is an extended region with plasma at logTe (K)=4.8 reaching 1.7R*. The magnetic diffusivity in this region is very small; unusually strong tidally modulated polarimetric variations of the system have been detected suggesting a strong coupling between gravitational tides and the stellar field. We propose to study the variation of the X-ray/UV spectrum of AK Sco as the stellar magnetospheres are modified by the tide.

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