Photometric Detection of Solar Type Binary Systems with Impacting Gas Streams

Details Photometric Detection of Solar Type Binary Systems with Impacting Gas Streams Photometric Detection of Solar Type Binary Systems with Impacting Gas Streams

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..322s&link_type=abstract

NOAO Proposal ID #2001A-0322

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Scientific paper

We hypothesize that many F to early K spectral type binaries formerly classifed as "thermally decoupled" contact binaries will reveal stream impacts when they are subjected to precision UBVRI multiband photometry. Other binaries with large diferences in eclipse depths formerly classifed as contact binaries in the 0.33 to 0.6d period range will also be found in this confguration, since these fall in the pre- contact period range for F to K dwarf binaries. We plan to obtain precision light curves of 20 to 25 candidates. Modern light curve synthesis techniques will be used to simultaneously model the multiband light curves. Impact spots will be adjusted numerically along with the stellar atmosphere parameters. Spectroscopic work will be used to verify stream activity in emission lines and to obtain radial velocity curves for calculating orbital parameters and fundamental physical characteristics. Our motive 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. Very early results have been encouraging with 50 percent recovery of stream systems from our search.

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