Longterm Photometry of Variables at La-Silla

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Many visiting astronomers at ESO are involved in the study of stellar variability on long time-scales (supergiants, Ap stars, pre-main-sequence stars ...). Real "monitoring" of variables during a time-span of several years is almost impossible because allotted observing runs are too short and not continuous. The long gaps between the visits of an individualobserver inevitably affect the homogeneity of the results (e. g. effects of changes in the instrumental system). A possible solution towards a more successful study of long-period variables is to select a restricted number of interesting objects of different type, and to observe them in an almost continuous way throughout succeeding observing seasons. Such an observing programme evidently calls for international collaboration in a well-organized team.

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