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 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 $$^{\prime \prime }$$ (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 $$5.7\pm 1.0$$ kpc and is having an age of $$50\pm 10$$ Myr. The mass function slope ( $$\Gamma $$ ) in the cluster region in the mass range of $$\sim $$ $$0.75<M/M_\odot <5.8$$ is estimated as $$-1.3\pm 0.2$$ , which is similar to the value of −1.35 given by Salpeter (1955). The cluster is not showing any signatures of mass-segregation and is currently undergoing dynamical relaxation.