Chemical composition of Am stars: RR Lyn and $\rho$ Pup

  • Yushchenko, A.V. (ARCSEC, Sejong Univ.) ;
  • Lee, J.J. (ARCSEC, Sejong Univ.) ;
  • Kang, Y.W. (ARCSEC, Sejong Univ.) ;
  • Doikov, D.N. (Odessa Marine University)
  • 발행 : 2008.10.22

초록

We present the results of the investigations of high dispersion spectra of two stars. These are the eclipsing binary RR Lyn, and $\rho$ Pup - the prototype of the group of pulsating variables. The spectra were obtained at 1.8 m Bohyuunsan observatory telescope, and 8.2 m VLT. We found the chemical composition. The both components of RR Lyn are Am stars (metallic line stars), but the abundance patterns of the components are not similar - the iron abundance and the abundances of other elements are surely different. For few elements the differences exceeds 1 dex. We found the abundances of 56 chemical elements in the atmosphere of $\rho$ Pup. This is one of the best stellar abundance patterns. It permits to investigate the role of the charge-exchange reactions in stellar atmospheres. These reactions can produce the abundance anomalies in the atmospheres of B-F type stars. These reactions can be one of the sources of galactic cosmic rays, and the reason of the braked rotation of A-F type chemically peculiar stars.

키워드