Datatype: byha

This datatype collects the recent CCD photometric observations of stars in open clusters made in the by-Halpha system, which uses the b and y filters of the Strömgren photometry.

The by Halpha data are used to search for Be stars in open clusters. The detection is made in a (b-y, y-Halpha) plane. These data are also used to build the color-magnitude diagram in the Strömgren system.

Record structure

No:Star number
V:V magnitude (y)
b-y:b-y colour index
yHa:y-Halpha index

Database access

List of clusters

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Last Update: 28 November 2005