Abstract:
In this study, the National Aeronautics and Space Administration (NASA) Kepler
space-craft high-precision data, and Gaia astrometric data were used to identify
new members of New General Catalogue, NGC 6811 open cluster. These new
members would be used to re-define and estimate the properties of the open
cluster. The new cluster members were classified in the Hertzsprung Russell (HR)
diagram. Delta (_) Scuti stars were identified from the HR diagram. A binarity
study conducted on the _ Scuti stars identified were used to re-define and estimate
the cluster properties of NGC 6811. Five new single members _ Scuti were identified
as Kepler Input Catalogue KIC 9716483, KIC 9716528, KIC 9716615, KIC 9716843
and KIC 9594935. New members were combined with the well-known members to
estimate mean distance modulus as 10.42 pc, logAge = 0.103 and metallicity =
0.0152 dex. This work was limited to Gaia second Data release (DR2) magnitudes
as well as the stars that have known parallax and proper motion values only. A
comparison of parallax and proper motion of Gaia DR2 with the most recently
released Gaia Early Data Release 3 (EDR3) was made and shows different values.
This implies that the two sets of data should be used independently.
