Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998coska..28..109z&link_type=abstract
Contributions of the astronomical observatory, vol. 28, p. 109
Astronomy and Astrophysics
Astronomy
4
Stellar Spectra, Variability, Peculiar Stars, Magnetic Stars, Radial Velocity, Lithium, Iron, Calcium, Praseodymium, Calibrating, Abundance, Charge Coupled Devices, Astronomical Photometry, Stellar Gravitation, Stellar Magnetic Fields
Scientific paper
We present a study of high dispersion Charge Coupled Devices (CCD) spectra of the roAp star HD 60435 taken in the ranges 6123-6175 A and 6675-6735 A. Variability of both the equivalent width and radial velocity of the neutral lithium line at 6708 A 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 identified but many absorptions, mostly in blends, remain unidentified.
North Pierre
Ziznovsky Josef
Zverko Juraj
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