... Observatory

Operated by the Association of Universities for Research in Astronomy, Inc. under cooperative agreement with the National Science Foundation.

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... changes

As the photomultiplier in the Coravel instrument is not cooled, the dark count, which is a function of the ambient temperature, has some minor influence on the depth of the correlation profile. It is unfortunate that the period of the star is almost exactly one year, since seasonal temperature variations may mimic the same kind of variation in equivalent width. However, comparison with other sources suggests that that effect is clearly less than the periodic element in the observed variations.

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