Rare earth maximum of the long period AP star HR 465

Details Rare earth maximum of the long period AP star HR 465 Rare earth maximum of the long period AP star HR 465

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...199..299r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 199, no. 1-2, June 1988, p. 299-303. NSERC-supported research.

Astronomy and Astrophysics

Astrophysics

12

A Stars, Mira Variables, Peculiar Stars, Rare Earth Elements, Stellar Composition, Cosmochemistry, Periodic Variations, Stellar Models, Stellar Rotation

Scientific paper

Observations of HR 465, during its 1982 to 1983 rare earth maximum phase, indicate that the star's period of spectrocopic variation is about 21 yr and that there is a substantial phase delay of about 1.5 yr from rare earth maximum to Cr minimum. The phase delay argues for a conventional oblique-rotator model for HR 465 and against the Shore and Adelman (1976) suggestion of a force-precession model. Wavelength-coincident-statistics of the annual observations of HR 465 suggest no major variations from the conclusions drawn from the very limited number of observations of the 1961 rare earth maximum.

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