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Rotation, Variability and Age of Ap Stars

Published online by Cambridge University Press:  12 April 2016

P. North
P. North*
Affiliation:
Institut d’Astronomie de l’Université de LausanneCH-1290 Chavannes-des-Bois, Switzerland

Abstract

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Photometrically determined gravities for field and cluster Ap stars, together with published periods, show that conservation of angular momentum alone is responsible for the observed increase of the periods with age. New photometric periods of a few cluster stars are presented which independently confirm this result. No outstanding change with age of the amplitude of lightcurves is noted.

Type
Section II - Systematics, Photometry
Information
International Astronomical Union Colloquium , Volume 90: Upper Main Sequence Stars with Anomalous Abundances , 1986 , pp. 167 - 170
Copyright
Copyright © Reidel 1986

References

References to Table 1

Klochkova, V.G., Kopylov, I.M., Kumaigorodskaya, R.N.: 1981, Sov. Astron. Lett. 2(3), 203 Google Scholar
Mermilliod, J.-C.: 1980, ThesisGoogle Scholar
North, P., Cramer, N.: 1981, in “Upper Main Sequence CP Stars”, 23rd Liège Astrophys. Coll., p. 55 Google Scholar

References

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Klochkova, V.G., Kopylov, I.M: 1984, in “The Magnetic Stars” (eds. Khokhlova, V.L., Ptitsyn, D.A., Lielausis, O.A.), Salaspils, p. 78 Google Scholar
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