The PSU/TCfA Search for Planets Around Evolved Stars: Vsin(i) Measurements for Slow Rotating F-K Giants

TL;DR

This paper reports on measurements of the projected rotational velocities (Vsin(i)) of F, G, and K giant stars, using high-quality spectra and a calibrated cross-correlation method to improve accuracy for slow rotators.

Contribution

It introduces a new calibration technique for the cross-correlation function to accurately measure Vsin(i) in slowly rotating evolved stars.

Findings

Vsin(i) measurements for a sample of F, G, and K giants.

Calibration method improves measurement accuracy for slow rotators.

Provides data useful for stellar evolution studies.

Abstract

We present results of our projected rotational velocities (Vsin(i)) measurements of F, G and K giants obtained from the cross-correlation function (CCF) constructed from high signal to noise spectra. We also present the calibration of the HET/HRS cross-correlation function to determine accurate projected rotational velocities Vsin(i) for slowly-rotating F-K giants.