STUDY OF 2 HGMN STARS WITH SUSPECTED ANOM ALIES OF ABUNDANCES OF NOBLE-GASES

The elemental abundances of three HgMn stars HD178065 and HD182308 wer e found. The parameters of their atmospheres were determined: T(eff) = 12 000 K, 1g g = 3.25, V(t) = 2 km s-1, and T(eff) = 13 500 K, lg g = 3.5, V(t) = 2 km s-1 for HD178065 and HD182308, respectively. Both st ars have Ga abundance by 3.5 orders of magnitude higher than the solar one, deficit of He, and excess of Xe. The abundance of Mn is in good agreement with dependence of the latter on effective temperatures that is typical for HgMn stars. In general, elemental abundances in both s tars are typical for HgMn stars.