3 research outputs found
Lithium on the surface of cool magnetic CP stars. II. Spectrum analysis of HD 83368 and HD 60435 with lithium spots.
As a further step in our Lithium project we present results of abundance
determination of some elements in the roAp star HD 60435. Possible NLTE
effects were considered.
Equivalent widths of spectral lines vary with rotational phase which suggests
nonuniform distribution of chemical elements over the stars' surface. Large
abundance differences derived from various ions of some rare earth elements
indicate their possible vertical stratification.
Two spots of enhanced lithium abundance were distinguished at the
magnetic poles on HD 60435 and their parameters derived.
The rotational axis inclination or and surface
magnetic field kG were determined for the first time
for HD 60435. The results are compared with HD 83368, the other star with
lines of lithium remarkably variable in intensity and wavelength