HR 465 returning to rare-earth-maximum phase

Details HR 465 returning to rare-earth-maximum phase HR 465 returning to rare-earth-maximum phase

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.294..636c&link_type=abstract

Nature, vol. 294, Dec. 17, 1981, p. 636, 637. Research supported by the Natural Sciences and Engineering Research Council of Can

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10

A Stars, Line Spectra, Maxima, Peculiar Stars, Radiant Flux Density, Rare Earth Elements, Stellar Spectra, Magnetic Stars, Minima, Periodic Variations, Spectrum Analysis

Scientific paper

The spectroscopic variability of the unusual Ap star HR465 has been discussed by Wolff and Preston (1970), who show that the sharp-lined spectrum at the rare-earth-minimum phase is similar to that of many other Ap stars of the magnetic sequence. Studies of the rare-earth-maximum phase in the early 1960s had shown it to have a high density of lanthanide rare-earth lines, in addition to Hg II 3984 A. Although the critical phase of HR465 has been unavailable until recently because of its 22-24 year period, three 2.4 A/mm spectrograms of HR465 taken in August 1981 show that the spectrum again closely resembles that of the early 1960s, with a recurrence of the rare-earth-maximum phase.

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