Abundances in 4 Lacertae and ν Cephei

Details Abundances in 4 Lacertae and ν Cephei Abundances in 4 Lacertae and ν Cephei

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..224..873y&link_type=abstract

The A-Star Puzzle, held in Poprad, Slovakia, July 8-13, 2004. Edited by J. Zverko, J. Ziznovsky, S.J. Adelman, and W.W. Weiss,

Astronomy and Astrophysics

Astrophysics

Stars, Abundances, Stars: Evolution, Stars: Individual, (4 Lac, Ν Cep).

Scientific paper

Using Kurucz's ATLAS9 model atmospheres I performed LTE fine analyses of the supergiants 4 Lac and ν Cep. The spectra were obtained at 1.22-m telescope of the Dominion Astrophysical Observatory (DAO) by Saul J. Adelman. The atmospheric parameters were derived using the wings of Hβ and Hγ profiles for each star, and from Fe I/II, Fe II/III, and Si II/III equilibria for 4 Lac, and from Fe I/II and Cr I/II equilibria for ν Cep. A microturbulence of 2.7 km s-1 for 4 Lac was found from Fe II lines while a mean value of 5.2 km s-1 for ν Cep from Cr II, Ti II and Fe II lines. The rotational and macroturbulent velocities are, respectively, 14±2km s-1 and 15± 2 km s-1 for 4 Lac, and 26 ± 2km s-1 and 12 ± 2km s-1 for ν Cep. Their He, CNO and light element abundances are solar or overabundant while their iron peak and heavy element abundances are solar or underabundant. The derived results show that 4 Lac has nuclearly processed matter in its photosphere while ν Cep does not.

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