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Title:
Multislit photoelectric magnetometer observations of Cepheids and supergiants - Probable detections of weak magnetic fields
Authors:
Borra, E. F.; Fletcher, J. M.; Poeckert, R.
Affiliation:
AA(Observatoire du Mont Megantic, Quebec, Canada), AB(Dominion Astrophysical Observatory, Victoria, British Columbia, Canada), AC(Dominion Astrophysical Observatory, Victoria, British Columbia, Canada)
Publication:
Astrophysical Journal, Part 1, vol. 247, July 15, 1981, p. 569-576. Research supported by the Natural Sciences and Engineering Research Council of Canada. (ApJ Homepage)
Publication Date:
07/1981
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Astronomical Photometry, Cepheid Variables, Magnetic Stars, Magnetometers, Stellar Magnetic Fields, Supergiant Stars, Circular Polarization, Electrophotometers, Error Analysis, Signal To Noise Ratios, Stellar Spectra, Zeeman Effect
DOI:
10.1086/159067
Bibliographic Code:
1981ApJ...247..569B

Abstract

A search has been conducted for longitudinal magnetic fields in several classical Cepheids, using a multislit photoelectric magnetometer capable of attaining precision an order of magnitude better than previous instruments. The technique used in the search represents an improvement of the procedure used by Borra and Landstreet (1973). A template with several slits matching the stellar spectrum has been used, instead of a unique slit and one line. The obtained observational data regarding the classical Cepheids are presented in a table. Several observations of the brightest Cepheids visible from the Northern Hemisphere have been listed. On the basis of an evaluation of the data, it is concluded that Cepheids, as a class, have weak magnetic fields that usually have longitudinal components of the order of few tens of gauss.

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