UBVRI photometry of stars in the fields of X-ray selected BL Lacertae objects

Paul S. Smith, Buell Tomasson Jannuzi, Richard Elston

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We present UBVRI photometry of stars in the fields of 38 X-ray selected BL Lacertae objects, two X-ray selected AGNs, and one X-ray binary system (possibly a cataclysmic variable). These stars are suitable for use as photometric comparison stars for optical monitoring programs involving these X-ray selected objects. A total of 166 observations of 87 stars were made on seven photometric nights. At least two stars were observed in every field. UBVRI measurements of three stars were made in the fields of MS 0950.9+4929, MS 1552.1+2020, and H2154-304. Four stars were measured in the field of H1426+428. Finding charts for all of these objects are included in this paper.

Original languageEnglish (US)
Pages (from-to)67-73
Number of pages7
JournalAstrophysical Journal, Supplement Series
Issue number1
Publication statusPublished - Sep 1991



  • BL Lacertae objects
  • Photometry
  • X-rays: binaries

ASJC Scopus subject areas

  • Space and Planetary Science

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