Standardization in the UV with Astrosat and its issues related to star
  cluster studies
  The Ultra-Violet Imaging Telescope (UVIT) is one of the payloads in Astrosat,
the first Indian Space Observatory. The UVIT instrument has two 375 mm
telescopes: one for the far-ultraviolet (FUV) channel (1300-1800 A), and the
other for the near-ultraviolet (NUV) channel (2000-3000 A) and the visible
(VIS) channel (3200-5500 A). We shall discuss the issues with standardization
in the UV with reference to Astrosat Observations (Cycle A04). I shall discuss
the problems faced in data-analysis and how these in turn lead to serious
issues dealing with the color-magnitude diagarms, membership and age of the
young embedded clusters studied.
