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Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9038m&link_type=abstract
HST Proposal ID #9038
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Hst Proposal Id #9038 Hot Stars
Scientific paper
We have discovered that EM Cygni, one of the most well-known cataclysmic variable stars {CVs}, is very likely in a triple system with a spatially-unresolved K dwarf. EM Cyg has well measured masses, and the white dwarf's mass of 1.1 Msun shows that it must have come from an AGB star. This, together with considerations of binary evolution, can be used to predict a lower limit to the present-day separation of EM Cyg and the K dwarf of > 18, AU. Ground-based imaging only puts an upper limit on the angular separation of 0.2'', equivalent to < 60, AU at the 300, pc distance of EM Cyg; this does not seriously test the evolutionary prediction. With HST and FGS1R on the other hand, we can resolve a separation 6 AU, providing a direct test of the evolutionary path that leads to CVs, as well as to the Super-Soft X-ray sources widely believed to be the progenitors of Type Ia supernovae.
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