Over 24 000 Delta Scuti Stars in the Galactic Bulge and Disk from the
  OGLE Survey
  We present the largest collection of delta Scuti-type stars in the Milky Way.
Together with the recently published OGLE collection of delta Sct variables in
the inner Galactic bulge, our sample consists of 24 488 objects distributed
along the Milky Way plane, over galactic longitudes ranging from about -170 deg
to +60 deg. The collection data include the I- and V-band time-series
photometry collected since 1997 during the OGLE-II, OGLE-III, and OGLE-IV
surveys. We show the on-sky distribution of delta Sct stars in the Galactic
bulge and disk, discuss their period, luminosity and amplitude distributions,
present Petersen diagram for multimode pulsators, distinguish 34 delta Sct
stars in eclipsing and ellipsoidal binary systems, and list probable members of
globular clusters.
