CCD UBV photometric study of five open clusters - Dolidze 36, NGC 6728,
  NGC 6800, NGC 7209 and Platais 1
  In this study, we present CCD UBV photometry of poorly studied open star
clusters, Dolidze 36, NGC 6728, NGC 6800, NGC 7209, and Platais 1, located in
the first and second Galactic quadrants. Observations were obtained with T100,
the 1-m telescope of the TUBITAK National Observatory. Using photometric data,
we determined several astrophysical parameters such as reddening, distance,
metallicity and ages and from them, initial mass functions, integrated
magnitudes and colours. We took into account the proper motions of the observed
stars to calculate the membership probabilities. The colour excesses and
metallicities were determined independently using two-colour diagrams. After
obtaining the colour excesses of the clusters Dolidze 36, NGC 6728, NGC 6800,
NGC 7209, and Platais 1 as $0.19\pm0.06$, $0.15\pm0.05$, $0.32\pm0.05$,
$0.12\pm0.04$, and $0.43\pm0.06$ mag, respectively, the metallicities are found
to be $0.00\pm0.09$, $0.02\pm0.11$, $0.03\pm0.07$, $0.01\pm0.08$, and
$0.01\pm0.08$ dex, respectively. Furthermore, using these parameters, distance
moduli and age of the clusters were also calculated from colour-magnitude
diagrams simultaneously using PARSEC theoretical models. The distances to the
clusters Dolidze 36, NGC 6728, NGC 6800, NGC 7209, and Platais 1 are
$1050\pm90$, $1610\pm190$, $1210\pm150$, $1060\pm 90$, and $1710\pm250$ pc,
respectively, while corresponding ages are $400\pm100$, $750\pm150$,
$400\pm100$, $600\pm100$, and $175\pm50$ Myr, respectively. Our results are
compatible with those found in previous studies. The mass function of each
cluster is derived. The slopes of the mass functions of the open clusters range
from 1.31 to 1.58, which are in agreement with Salpeter's initial mass
function. We also found integrated absolute magnitudes varying from -4.08 to
-3.40 for the clusters.
