HR 7098: A new cool HgMn star?

TL;DR

This study reveals that HR 7098, previously thought to be a normal A0V star, exhibits significant elemental abundance anomalies, with heavy elements overabundant and lighter elements underabundant, based on high-quality spectral analysis.

Contribution

First detailed elemental abundance analysis of HR 7098 showing deviations from solar composition and challenging its classification as a normal A0V star.

Findings

Helium and Carbon are underabundant.

Heavy elements are overabundant.

Star's composition differs from typical A0V stars.

Abstract

Using one archival high dispersion high quality spectrum of HR 7098 (A0V) obtained with the \'echelle spectrograph SOPHIE at Observatoire de Haute Provence, we show that this star is not a superficially normal A0V star as hitherto thought. The model atmosphere and spectrum synthesis modeling of the spectrum of HR 7098 reveals real departures of its abundances from the solar composition. We report here on our first determinations of the elemental abundances of 35 elements in the atmosphere of HR 7098. Helium and Carbon are underabundant whereas the very heavy elements are overabundant in HR 7098.