CCD BV and 2MASS photometric study of the open cluster NGC 1513

TL;DR

This study combines optical and near-infrared photometry to determine the physical parameters of the open cluster NGC 1513, including its size, distance, reddening, age, and metallicity.

Contribution

It provides a comprehensive photometric analysis of NGC 1513 using CCD BV and 2MASS JHKs data, deriving key cluster parameters for the first time with combined optical and infrared data.

Findings

Cluster center at RA 04h09m36s, Dec 49°28'43''

Distance of approximately 1440 pc

Age estimated at about 250 million years

Abstract

We present CCD BV and JHK$_{s}$ 2MASS photometric data for the open cluster NGC 1513. We observed 609 stars in the direction of the cluster up to a limiting magnitude of $V\sim19$ mag. The star count method shows that the centre of the cluster lies at $\alpha_{2000}=04^{h}09^{m}36^{s}$, $\delta_{2000}=49^{\circ}28^{'}43^{''}$ and its angular size is $r=10$ arcmin. The optical and near-infrared two-colour diagrams reveal the colour excesses in the direction of the cluster as $E(B-V)=0.68\pm0.06$, $E(J-H)=0.21\pm0.02$ and $E(J-K_{s})=0.33\pm0.04$ mag. These results are consistent with normal interstellar extinction values. Optical and near-infrared Zero Age Main-Sequences (ZAMS) provided an average distance modulus of $(m-M)_{0}=10.80\pm0.13$ mag, which can be translated into a distance of $1440\pm80$ pc. Finally, using Padova isochrones we determined the metallicity and age of the cluster as $Z=0.015\pm 0.004$ ($[M/H]=-0.10 \pm 0.10$ dex) and $\log (t/yr) = 8.40\pm0.04$, respectively.