Selection of red giants that have a given type of photometric data

The red giant stars in a cluster have not been all observed in the UBV, DDO or Geneva photometric systems. To know which stars have been measured in a given photometric system, use command gk like

gk -eq "data type"

and to know which stars have not been observed, see the next item.

The keys for the photometric systems are identical to the data types defined throught the database:

ubv , pgh , gen , ddo , ri , egg , iyz , wing .

Example:

gk -eq ddo lists the red giants which have DDO data