Abstract
We define adegree of contact index,I c, and give its frequency diagram for 16 early-type close binaries. The eventual objective is to see whether the numbers of such systems are continuous or discontinuous across marginal contact. Data for four of the systems-TU Mus, V499 Sco, δ Pic, and SZ Cam-are from new photometric analyses, whose results are also given. Present results suggest that there is continuity in frequency across marginal contact, although one would like to include more binaries as further observations become available. An interesting point is that the only two systems in the bin of largestI c are known to be in the rapid phase of mass transfer.
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Wilson, R.E., Rafert, J.B. A note on the statistics of early-type close binaries. Astrophys Space Sci 76, 23–33 (1981). https://doi.org/10.1007/BF00651239
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DOI: https://doi.org/10.1007/BF00651239