J/PASP/106/967 J/PASP/106/967 Secondary Photometric Standard Stars I Joergensen Publ. Astron. Soc. Pac. 106 967 1994 1994PASP..106..967J Photometry, Cousins Photometry, special systems Photometry, standards CCD photometry is presented for 119 stars observed in the Thuan-Gunn photometric system (the passbands vgr). The sample includes 82 stars for which magnitudes in this system have not previously been published. Photometry in the Johnson-Kron-Cousins photometric system (BV or UBV) has been obtained for a sub-sample of 85 of the stars. Of those stars which are not primary standard stars for the Thuan-Gunn system 70 observed in Gunn r, 48 observed in Gunn g, and 37 observed in Gunn v have sufficient repeat measurements that they may be used as secondary standard stars for CCD photometry. The typical uncertain- ties for the magnitudes of these stars are 0.006 mag.

Name Name of star E4, E5, E6, E7, E8, E9: Johnson standard stars from Graham (1982, PASP, 94, 244). N300: Johnson standard stars from Graham (1981, PASP, 93, 29). 1MarkA, PG1633+099, SA92, SA110: Johnson standard stars from Landolt (1992, AJ, 104, 340). F762-9, F1038-6: Stobie et al. (1985, A&AS, 60, 503), not used for the standard calibration. F762-9-2 is variable. BD, Feige, GL745, G18-39, G68-30, HD84937, M67, and Ross: Kent (1985, PASP, 97, 165). Other HD and SA: Zinn (1980, ApJS, 42, 19), not used for the standard calibration. --- V Magnitude in Johnson V mag e_V Mean error on magnitude in Johnson V mag o_V Number of observations in Johnson V --- B-V B-V, Johnson system mag e_B-V Mean error on B-V mag o_B-V Number of observations for B-V --- U-B U-B, Johnson system mag e_U-B Mean error on U-B mag o_U-B Number of observations for U-B --- r Magnitude in Gunn r mag e_r Mean error on magnitude in Gunn r mag o_r Number of observations in Gunn r --- g Magnitude in Gunn g mag e_g Mean error on magnitude in Gunn g mag o_g Number of observations in Gunn g --- v Magnitude in Gunn v mag e_v Mean error on magnitude in Gunn v mag o_v Number of observations in Gunn v --- Nancy G. Roman ADC/SDDOO 1995Mar16This document was prepared by I. Joergensen whom we thank for both the document and the data. It was modified slightly by the undersigned. J_PASP_106_967.xml