Teutsch 76: a Deep Near-Infrared Study

TL;DR

This study provides a comprehensive near-infrared analysis of the Teutsch 76 open cluster, determining its structure, distance, age, and mass function, and assessing its dynamical state using combined observational data.

Contribution

It presents the first detailed near-infrared and proper motion analysis of T76, revealing its physical parameters and dynamical status with high precision.

Findings

Cluster radius is 1.24 pc with 28 probable members.

Located at 5.7 kpc with an age of 50 Myr.

Mass function slope is -1.3, similar to Salpeter's value.

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 {\it 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 $5.7\pm1.0$ kpc and is having an age of $50\pm10$ Myr. The mass function slope ($\Gamma$) in the cluster region in the mass range $\sim$0.75$<$M/M$_\odot$$<$5.8 is estimated as $-1.3\pm0.2$, which is similar to the value `-1.35' given by \citet{1955ApJ...121..161S}. The cluster is not showing any signatures of mass-segregation and is currently undergoing dynamical relaxation.