Physical and Chemical Parameters of HgMn Stars Based on Available Data

Abstract

HgMn stars are among the quietest stars of the main sequence. They represent the A2-B5 subclasses, being slow rotators, and they are more often in binary systems than in normal stars. Their effective temperatures are in the range from 10000 K to 16000 K, and the existence of the magnetic field in their atmospheres is still the subject of debates. HgMn stars belong to the group of Chemically Peculiar (CP) stars, and as a separate subgroup they are characterized by unusually strong lines of HgII and MnII. The HgMn stars often show mild helium deficiencies, and sometimes the presence of other peculiarities has been reported: for instance, isotopic anomalies in platinum and mercury are mentioned in some of them. To see the trends of chemical abundances in those stars, I used the element abundances expressed by solar values and the final results are compared with the ones compiled by Smith [1]. For the first time, such kind of search Astrophysics, Vol. 57, No. 1, March , 2014