Zeeman observations of W SGR

Details Zeeman observations of W SGR Zeeman observations of W SGR

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980cpsp.book...57w&link_type=abstract

In NASA. Goddard Space Flight Center Current Probl. in Stellar Pulsation Instabilities p 57-67 (SEE N80-25229 15-90)

Astronomy and Astrophysics

Astronomy

Astrometry, Astronomy, Cepheid Variables, Stellar Magnetic Fields, Magnetic Field Configurations, Periodic Variations, Pulses, Spectrophotography

Scientific paper

A new precise method for measuring magnetic fields on Zeeman plates of the southern Cepheid 'W Sgr' is reviewed. Ten plates over the 7.6(d) period of pulsation show two extrema in the measured values of the effective magnetic field. The method has a precision of + or - 0.4 microns in the Zeeman shift corresponding to + or - 50 Gauss (g). A negative spike of -220 g occurred at the time of arrival of the compressional wave of pulsation at the stellar surface. A positive field of +270 g occurred at the phase of most rapid contraction near the temperature minimum of the pulsation cycle.

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