Updates to Standards - 12-14-1999

A new solution for determining the magnitudes for the secondary standards in each calibration field was derived by Sergei Nikolaev of UMASS in November, 1999.

After receiving new magnitudes and new secondary standards, each field was carefully examined to remove secondary standards that fell near the scan border or were in confused areas. This was done by visual inspection.

Each calibration field was also run through CALMON using a set of test nights. Additional secondaries were rejected at this time if the delta magnitude for at least one band was consistently large over the set of six scans.

Of the initial 1503 secondary standards provided by Sergei, 513 secondary standards were rejected as a result of the above analysis.
Four additional secondary standards were rejected due to problems seen during processing: two were found to be eclipsing binarys, one is a known variable and one is a double. The total set of 517 rejected secondary standards are list here. A count of number of rejected secondary standards per calibration field is found here.
Go here to see a summary of the December 14, 1999 updates

UPDATE April 12,2000
Another secondary standard rejected from cal field 90547 due to varying magnitudes. This is probably an eclipsing binary.
This brings the total number of rejected standards to 518.
Go here to see a summary of this update.

UPDATE April 26,2000
Another secondary standard rejected from cal field 90009 due to varying magnitudes. This is probably an eclipsing binary.
This brings the total number of rejected standards to 519.
Go here to see a summary of this update.

UPDATE May 5, 2000
Another secondary standard rejected from cal field 90009 due to varying magnitudes. This is probably an eclipsing binary.
This brings the total number of rejected standards to 520.
Go here to see a summary of this update.

UPDATE May 25,2000
Another secondary standard rejected from cal field 90247 due to being an extended source.
This brings the total number of rejected standards to 521.
Go here to see a summary of this update.



View light curves of eclipsing binaries here