Far-ultraviolet investigation into the galactic globular cluster M30
  (NGC 7099): II. Potential X-ray counterparts and variable sources
  We present a far-ultraviolet (FUV) study of the globular cluster M30 (NGC
7099). The images were obtained using the Advanced Camera for Surveys (ACS/SBC,
F150LP, FUV) and the Wide Field Planetary Camera 2 (WFPC2, F300W, UV) on board
the Hubble Space Telescope (HST). We compare the catalogue of FUV objects to
ten known X-ray sources and find six confident matches of two cataclysmic
variables (CVs), one RS CVn, one red giant with strong FUV emission and two
sources only detected in the FUV. We also searched for variable sources in our
dataset and found a total of seven blue stragglers (BSs), four horizontal
branch (HB) stars, five red giant branch stars, 28 main sequence stars and four
gap objects that demonstrated variability. One BS star is a known W-UMa contact
binary, one of the gap objects is a known CV identified in this work to be a
dwarf nova, and the three other gap sources are weak variables. The periods and
positions of two of the variable HB stars match them to two previously known RR
Lyrae variables of types RRab and RRc.
