Gaia and Kepler observations of new general catalogue 6811.

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.