Evolutionary period changes in the rapidly oscillating AP stars

Details Evolutionary period changes in the rapidly oscillating AP stars Evolutionary period changes in the rapidly oscillating AP stars

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329l..43h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 329, June 1, 1988, p. L43-L46.

Statistics

Computation

53

A Stars, Peculiar Stars, Stellar Evolution, Stellar Oscillations, Main Sequence Stars, Secular Variations, Stellar Models, Vibration Mode

Scientific paper

Preliminary computations of the asymptotic p-mode frequency spacings, and their time derivatives, are presented for a grid of evolutionary models of the rapidly oscillating Ap ('roAp') stars. It is shown how the frequency spacings depend on stellar mass, metallicity, and evolutionary stage. The frequency spacings observed in two of the roAp stars indicate that they either are main-sequence objects or have evolved off of the main sequence, depending on how the pulsation spectrum is interpreted. A way to remove this ambiguity is suggested: secular evolutionary changes in the pulsation frequencies may be measurable if the roAp stars have evolved off of the main sequence. In principle, this determination may be made for the roAp star HR 1217 with existing data.

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