Synchronization of the G Giant Rotation in the Symbiotic Binary StHa 190?

TL;DR

This study analyzes spectral data of the symbiotic star StHa 190, revealing a 30-day period and suggesting that the observed spectral variations are not due to the star's orbital motion, providing insights into its rotation and spectral features.

Contribution

The paper offers new high-resolution spectral analysis of StHa 190, identifying a 30-day period and challenging previous assumptions about the origin of spectral line variations.

Findings

Identified a 30-day period from spectral line radial velocities.

Suggested that spectral line changes are not due to orbital motion.

Provided insights into the rotation of the G giant in the binary system.

Abstract

We present an analysis of high resolution spectral observations of the symbiotic star StHa 190. A 30 days period has been derived from radial velocities of the G-type absorption lines and the HeII 4686A emission line. The main aim of this work was to look for explanation of the very wide absorption lines of the yellow giant. The very low mass function obtained from the absorption lines radial velocities suggests that the observed changes probably do not corespond to the orbital motion of this star.