Preliminary results from 5 years' spectral monitoring of Antares

TL;DR

This study reports five years of radial velocity monitoring of Antares, revealing multiple periodicities and atmospheric dynamics, with preliminary results consistent with prior observations and ongoing detailed analysis.

Contribution

First long-term spectral monitoring of Antares' radial velocity, providing new insights into its atmospheric dynamics over multiple time scales.

Findings

Consistent with previous observations.

Identification of multiple periodicities.

Data set spans five years with 580 spectra.

Abstract

We present preliminary results of 5 years' monitoring of the radial velocity of Alpha Sco, performed at the Astronomical Observatory of the Universidad de Los Andes in Bogot\'a, Colombia. The data include 580 spectra acquired on 153 nights between March 2015 and March 2020. The aim of this study is to probe the dynamics of the star's atmosphere on all possible time-scales through the variations in observed radial velocity. At present, our findings are consistent with previous results from other observers, and the combination of older and new data make it possible to assess the several periodicities. A detailed study of these results, including the convective motions in the photosphere, is still in progress.