Other
Scientific paper
Feb 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop...22s&link_type=abstract
NOAO Proposal ID #2002A-0022
Other
Scientific paper
Our quest is the discovery of near-contact solar type eclipsing binaries which show evidence of stream impacts. The existence of stream impacts would provide evidence of dynamic mass transfer possibly leading to coalescence into contact. This would lend strong support to the theoretical scenarios of 1) Angular Momentum Loss (AML) via magnetic breaking and 2) Thermal Relaxation Oscillations (TRO) ,ie., oscillations between a near-contact and shallow contact modes. We hypothesize that many F to early K spectral type binaries formerly classified as ''thermally decoupled'' contact binaries and other binaries with large differences in eclipse depths formerly classified as contact binaries in the 0.33 to 0.5d period range will reveal such stream impacts when they are subjected to precision UBVRI multi-band photometry, since these fall in the pre-contact period range for F to K dwarf binaries. Modern light curve synthesis techniques will be used to simultaneously model the multi-band light curves. Impact spots will be adjusted numerically along with the stellar atmosphere parameters. Spectroscopic work will follow to verify stream activity in emission lines and to obtain radial velocity curves for calculating orbital parameters and fundamental physical characteristics. Our larger goal is to understand close binary evolution in general, in detached, semi-detached and contact modes. This study could supply an important piece to the puzzle. We now have found four stream system candidates: CN And, BE Cep, ZZ Eri and V343 Cen giving us an encouraging 40 % rate of recovery.
Faulkner Danny R.
Hube Doug
Samec Ronald G.
van Hamme Walter
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