Determination of the Abundance of Mercury from the Hg <scp>ii</scp> Line at 5677.10 Å. XXII. HD 144206 (<i>υ</i> Her)

Abstract The weak line of Hg ii located at 5677.10 Å is detected in ELODIE spectra of the HgMn star HD 144206 as a feature absorbing about 2% of the continuum. The synthesis of this line yields a mercury abundance which is slightly larger than previous determinations. Line synthesis is used to measure the abundances of several elements. The following excesses/deficiencies are found: helium (−1.00 dex), magnesium (−0.47 dex), titanium (+0.91) , chromium (+0.54), manganese (+1.92), iron (−0.71) , yttrium (+2.50), mercury (+4.97). A conservative uncertainty on the excesses/deficiencies is estimated to be ±0.10 dex. The recent Transiting Exoplanet Survey Satellite lightcurves of HD 144206 acquired in 2022 and 2024 show a complex pattern of variability but no clear periodicity.