Other
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop...84s&link_type=abstract
NOAO Proposal ID #1999B-0084
Other
Scientific paper
We hypothesize that many F to early K spectral type binaries formerly classified as "thermally decoupled" (Maceroni and Van 'TVeer 1990) contact binaries will reveal stream impacts when they are subjected to precision UBVRI multi-band photometry. Other near contact binaries with large differences in eclipse depths formerly classified as contact binaries in the 0.5 to 0.33d period range will also be found in this configuration, since these fall in the pre-contact period range for F-K dwarf binaries. In this preliminary part of our study, we plan to obtain precision light curves of 20-25 likely candidates. Modern light curve synthesis techniques will be used to simultaneously model the multi-band light curves. Impact spots will be adjusted numerically within our models along with other astrophysical stellar atmosphere parameters. After this preliminary photometry, follow-up spectroscopic work will be done in the visible, UV and IR follow-up work will be done in the visible and in UV and IR to verify stream activity in emission lines. Our goal is to confirm the detached-to-contact scenario suggested by Guinan and Bradstreet. Our larger goal is to understand close binary evolution in general, in detached, semidetached and contact modes. This study could supply an important piece to the puzzle.
Faulkner Danny R.
Hube Doug
Samec Ronald G.
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