HR8844: A new hot Am star ?

TL;DR

This study reveals that HR8844, previously considered a normal A0V star, exhibits significant chemical peculiarities with abnormal elemental abundances, suggesting it may be a hybrid between HgMn and Am stars.

Contribution

First detailed elemental abundance analysis of HR8844 showing its chemical peculiarities and hybrid nature between HgMn and Am stars.

Findings

Most light elements are underabundant.

Heavy elements are overabundant.

Star is chemically peculiar, not normal.

Abstract

Using one archival high dispersion high quality spectrum of HR8844 (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 HR8844 reveals large departures of its abundances from the solar composition. We report here on our first determinations of the elemental abundances of 41 elements in the atmosphere of HR8844. Most of the light elements are underabundant whereas the very heavy elements are overabundant in HR8844.This interesting new chemically peculiar star could be a hybrid object between the HgMn stars and the Am stars.