Rotation of delta Scuti Stars in the Open Clusters NGC1817 and NGC7062

TL;DR

This study investigates the rotational properties and binarity of delta Scuti stars in two open clusters, revealing their rotational velocities, binary status, and physical parameters through spectroscopic and photometric data.

Contribution

It provides new spectroscopic and photometric measurements of delta Scuti stars in NGC1817 and NGC7062, including their rotation rates and binary classifications, which were previously uncharacterized.

Findings

All observed delta Scuti stars are moderate or fast rotators.

Several stars are identified as spectroscopic binaries.

Physical parameters like temperature and gravity are measured for all targets.

Abstract

We report results of spectroscopic and photometric observations of ten delta Scuti stars and one eclipsing binary in the open cluster NGC1817, and of ten delta Scuti stars and two other variables in the open cluster NGC7062. For all targets in NGC1817 and for three targets in NGC7062, the radial velocity and projected rotational velocity are determined. For all stars, the effective temperature and surface gravity is measured. Two delta Scuti stars, NGC1817-V1 and NGC7062-V1, and the eclipsing binary, NGC1817-V18, are discovered to be single-lined spectroscopic binaries. The eclipsing binary delta Scuti star NGC1817-V4 is discovered to be a double-lined spectroscopic binary. All delta Scuti stars which we observed spectroscopically are found to be moderate or fast rotators.