The command gk displays the file containing the information on the cluster red giants. These files are part of an unpublished catalogue of about 3200 red giants in open clusters. The description of the record content is given in Appendix I.
> ngc 0129 move to NGC 129.
> gk list the file.
> gk 164 display one star.
> gk ph -eq ubv select the stars with UBV data.
> gk ph -ne ddo select the stars without DDO data.
Arguments for the keyword ph (photometry) are: ubv pgh gen ddo cmt ri egg iyz wing.
A tentative classification (ABCD) has been developed to indicate the evolutionary state of the red giants. (See Appendix I for further comments. A selection can be performed on the classification with the keyword "cl".
> gk cl -eq C list clump red giants
> gk cl -eq A list AGB giants
> gk cl -eq F list the field stars
> gk cl -eq sb list the spectroscopic binaries