SOAR Adaptive Optics Observations of the Globular Cluster NGC6496

Abstract

We present high-quality BVRI photometric data in the field of globular cluster NGC 6496 obtained with the SOAR Telescope Adaptive Module (SAM). Our observations were collected as part of the ongoing SAM commissioning. The distance modulus and cluster color excess as found from the red clump is $\mMv = 15.71 \pm 0.02$\,mag and $\EVI = 0.28 \pm 0.02$\,mag. An age of $10.5\pm 0.5$\,Gyr is determined from the difference in magnitude between the red clump and the subgiant branch. These parameters are in excellent agreement with the values derived from isochrone fitting. From the color-magnitude diagram we find a metallicity of $\feh = -0.65$\,dex and hence support a disk classification for NGC 6496. The complete $BVRI$ data set for NGC 6469 is made available in the electronic edition of the Journal.

Accepted for publication in The Astronomical Journal

References in corpus (3)

• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• Galactic Globular and Open Clusters in the Sloan Digital Sky Survey. II. Test of Theoretical Stellar Isochrones
• Ruprecht 147: The oldest nearby open cluster as a new benchmark for stellar astrophysics

Cited by in corpus (11)

• Accurate distances to Galactic globular clusters through a combination of Gaia EDR3, HST and literature data
• Absolute V-band magnitudes and mass-to-light ratios of Galactic globular clusters
• The VISCACHA survey - I. Overview and First Results
• SOAR Adaptive Module (SAM): seeing improvement with a UV laser
• The VISCACHA survey -- II. Structure of star clusters in the Magellanic Clouds periphery
• An AO-assisted variability study of four globular clusters
• First results from SAM-FP: Fabry-Perot observations with ground-layer adaptive optics - the structure and kinematics of the core of 30 Doradus
• The NGC 454 system: anatomy of a mixed on-going merger
• A likely runaway star cluster in the outer disc of the Large Magellanic Cloud
• Star Formation Rate Distribution in the Galaxy NGC 1232
• SAMplus: adaptive optics at optical wavelengths for SOAR