A resource for multifrequency campaigns: a revised catalogue of UBVRIJHK calibration stars in AGN/blazar fields

Kidger, Mark; Martín-Luis, Fabiola; Nicolás González-Pérez, José; Narbutis, Donatas
Bibliographical reference

New Astronomy Reviews, Volume 48, Issue 5-6, p. 505-507.

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4
2004
Number of authors
4
IAC number of authors
2
Citations
3
Refereed citations
2
Description
We present a revised and augmented version of the Gonzalez-Perez et al. [AJ 122 (2001) 2055] catalogue of stars in quasar and blazar fields calibrated in the Landolt system. Several of the sources in this catalogue are known TeV emitters and thus of considerable interest for multifrequency campaigns. A total of 8000 measures in BVRI have been added, mostly of previously poorly observed fields giving a total of more than 20,000 measures of stars in 26 fields, in addition to the 22,000 measures of 122 field stars of 13 AGNs in JHK presented in the published catalogue. The new catalogue flags detected and possible variables (e.g., Star 8 of 3C66a which appears to be a Mira star of period 5 years). Deeper exposures have been taken of the fields of the faint gamma ray blazars PKS0528+13 and PKS1622-29, frequent targets of multifrequency monitoring campaigns, to improve the quality of their photometry.