Spectroscopic studies of HgMn stars in binary systems: physical parameters, abundances, and the nature of their companions

• Applicant: Privatdozentin Dr. Swetlana Hubrig
• Subject Area: Astrophysics and Astronomy
• Term: from 2012 to 2014
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 230133601

• Final Report Year: 2014

Final Report Abstract

In one of the manuscripts, for the late B-type star HD 11753 exhibiting HgMn chemical peculiarity, we calculated for the first time the surface maps of Y II, Sr II, Ti II, and Cr II using the Doppler imaging technique. We determined the binary orbit of HD 11753 and fine-tuned the rotation period of the primary. The earlier discovered fast evolution of the chemical spots is confirmed by an analysis using both the chemical spot maps and equivalent width measurements. In the second manuscript, we discovered that HD 161701 is a binary system formed by two chemically peculiar stars in an almost circular orbit with a period of 12.451 d. We also found a coincidence of chemical spots with the position of the binary companion, suggesting a possible connection between the presence of the companion and the origin of chemical anomalies.

Publications

• Chemical surface inhomogeneities in late B-type stars with Hg and Mn peculiarity I. Spot evolution in HD 11753 on short and long time scales”. Astronomy & Astrophysics, Vol. 553, A27, 2013
  Korhonen, H.; González, J. F.; Briquet, M.; Flores Soriano, M.; Hubrig, S.; Savanov, I.; Hackman, T.; Ilyin, I. V.; Eulaers, E. & Pessemier, W.
  
• “HD 161701, a chemically peculiar binary with a HgMn primary and an Ap secondary”. Astronomy & Astrophysics, Vol. 561, A63, 2014
  González, J. F.; Saffe, C.; Castelli, F.; Hubrig, S.; Ilyin, I.; Schöller, M.; Carroll, T. A.; Leone, F. & Giarrusso, M.