CAOSP abstracts, Volume: 28, No.: 2, year: 1998
- Author(s): ZVERKO, J.; ZIZNOVSKY, J.; NORTH, P.
- Journal: Contributions of the Astronomical Observatory Skalnate Pleso,
vol. 28, no. 2, p. 109-120.
- Date: 10/1998
- Title: Spectrum variability of the roAp star HD 60435 in the red region
- Keyword(s): CHEMICALLY PECULIAR STARS, LITHIUM 6708 AA-BLEND, SPECTRUM VARIABILITY,
ATMOSPHERE PARAMETERS, ELEMENTAL ABUNDANCES
- Pages: 109 -- 120
We present a study of high dispersion CCD spectra of the roAp star HD 60435
taken in the ranges 6123-6175 AA and 6675-6735 AA. Variability of both the
equivalent width and radial velocity of the neutral lithium line at 6708 AA was
found out. We also noticed a variability of equivalent width of stronger lines
of Fe, Ca and Pr, though to a lesser extent. Effective temperature and surface
gravity were derived using photometric calibrations. Abundances of identified
elements were estimated. Aluminium is deficient by a factor of 20, Si and Sc
are only slightly deficient. Fe and Ni are normal, Ca and Ti slightly
overabundant. Cr, Mn and Co are overabundant by a factor of 15 to 25. Of rare
earths, La, Ce and Gd are overabundant by a factor of 3 to 10, Sm and Nd by
factors of 30 and 60 and Eu and Dy by factors of 150 and 300. Lines of Pr III
were indentified but many absorptions, mostly in blends, remain unidentified.
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