Magnetic-field dependence of chemical anomalies in CP stars

Details Magnetic-field dependence of chemical anomalies in CP stars Magnetic-field dependence of chemical anomalies in CP stars

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007astbu..62..244g&link_type=abstract

Astrophysical Bulletin, Volume 62, Issue 3, pp.244-256

Other

1

97.30.Fi, 97.10.Ld

Scientific paper

The dependence of the degree of anomaly of parameter Z of Geneva photometry ( Z0 = Z CP ℒ Z norm.) on the average surface magnetic field Bs is analyzed. The Z0 value is proportional to the degree of anomaly of chemical composition. It was found that Bs → 0 corresponds Z0 → -0.010÷ -0.015, i.e., part of CP stars are virtually devoid of magnetic field, but exhibit chemical anomalies. This effect may be due to selection whereby only objects with strong chemical anomalies are classified as CP stars, thereby producing a deficit of stars with relatively weak anomalies. Moreover, CP stars have other sources of stabilization of their atmospheres besides the magnetic field, e.g., slow rotation. Formulas relating Z0 to Bs are derived.

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