The spectrum of the AP star HR 465 near the rare-earth minimum phase

Details The spectrum of the AP star HR 465 near the rare-earth minimum phase The spectrum of the AP star HR 465 near the rare-earth minimum phase

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..85..315g&link_type=abstract

Astrophysics and Space Science, vol. 85, no. 1-2, July 1982, p. 315-324.

Astronomy and Astrophysics

Astrophysics

3

A Stars, Abundance, Peculiar Stars, Stellar Spectra, Chromium, Iron, Rare Earth Elements, Spectral Line Width, Variability

Scientific paper

Four spectra of the long-period Ap star HR 465 were taken in 1969-70 near its rare-earth minimum phase and analyzed. Equivalent widths or upper limits were obtained for lines of 23 elements. Lines of Cr were very strong. The Sc/Fe, Ti/Fe, V/Fe, and Ni/Fe abundance ratios were found to be abnormally low, while the Cr/Fe ratio was abnormally high (approximately 0.08). The equivalent widths in 1969-70 were compared with those measured by Aller on a spectrum taken in 1960 near the rare-earth maximum phase. Ionized lines of Sc, Ti, V, Fe, Nb, Mo, and the rare-earths all vary out of phase with the Cr I and Cr II lines. Although Mo and Cr occupy corresponding positions in the periodic table, the Mo/Cr abundance ratio was apparently at least 180 times higher in 1960 than in 1969-70.

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