WOCS 4540: Detailed Analysis of a Very Long Orbital Period Blue Straggler

Meng Sun, Robert D. Mathieu

WOCS 4540 is the longest orbital period ($P_{\mathrm{orb}}=3030$ days) blue straggler (BSS) - white dwarf (WD) pair in the old open cluster NGC 188 . It also contains one of the most lu…