UBVRI field comparison stars for selected active quasars and BL Lacertae objects
UBV (Johnson) and RI (Cousins) magnitudes of field comparison stars for several active quasars and BL Lacertae objects are presented. The comparison stars can be used for photoelectric and CCD monitoring of the variability in brightness and optical-continuum spectral index of these BL Lacs and QSOs. 21 references.
- Research Organization:
- New Mexico Univ., Albuquerque; Hopkins Observatory, Williamstown, MA; California State Univ., San Bernardino; Steward Observatory, Tucson, AZ
- OSTI ID:
- 5799181
- Journal Information:
- Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 90; ISSN ANJOA
- Country of Publication:
- United States
- Language:
- English
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