Teutsch 76: a Deep Near-Infrared Study

Abstract

We have performed a detailed analysis on the Teutsch 76 (T76) open cluster using the deep near-infrared (NIR) observations taken with the TANSPEC instrument mounted on the 3.6m Devasthal Optical Telescope (DOT) along with the recently available high quality proper motion data from the Gaia data release 3 and deep photometric data from Pan-STARRS1 survey. We have found that the T76 cluster is having a central density concentration with circular morphology, probably due to the star formation processes. The radius of the T76 cluster is found to be 45 ′′ (1.24 pc) and 28 stars within this radius were marked as highly probable cluster members. We have found that the cluster is located at a distance of 5.7 ± 1.0 kpc and is having an age of 50 ± 10 Myr. The mass function slope (Γ) in the cluster region in the mass range ∼0.75<M/M ⊙ <5.8 is estimated as −1.3 ± 0.2, which is similar to the value '-1.35' given by Salpeter (1955). The cluster is not showing any signatures of mass-segregation and is currently undergoing dynamical relaxation.