Computer Science
Scientific paper
Feb 1950
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1950natur.165..195s&link_type=abstract
Nature, Volume 165, Issue 4188, pp. 195 (1950).
Computer Science
1
Scientific paper
THE A0 star HD125248 (BD - 18°3789 Virginis) exhibits periodic changes1 in the intensities of its absorption lines, principally those due to europium II and chromium II, with a period2 of 9.295 days; the Eu II lines have their maximum intensity when the Cr II lines are a minimum and vice versa. Babcock3 finds that this star has a magnetic field which varies with the same period as the absorption lines, the polar field-strength being between 7,000 to 8,000 gauss towards the earth when the Eu II lines have their greatest intensity, and of the order of 6,000 gauss of opposite polarity at the Eu II minimum. The light curve of this star was not hitherto known but has been determined at the Commonwealth Observatory in view of the remarkable interest of this star in connexion with the current theory of magnetism of rotating bodies. The results obtained with the 9-inch Oddie refractor and an IP21 electron multiplier are shown in the accompanying graph. The light curve is well defined, the range of the variability being 0.054 mag. with the above period.
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