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UBVRI photometry of stars in the fields of X-ray selected BL Lacertae objects
- Source :
- Astrophysical Journal Supplement Series. 77
- Publication Year :
- 1991
- Publisher :
- United States: NASA Center for Aerospace Information (CASI), 1991.
-
Abstract
- UBVRI photometry is presented 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 H 2154 - 304. Four stars were measured in the field of H 1426 + 428. Finding charts for all of these objects are included.
- Subjects :
- Astronomy
Subjects
Details
- Language :
- English
- ISSN :
- 00670049
- Volume :
- 77
- Database :
- NASA Technical Reports
- Journal :
- Astrophysical Journal Supplement Series
- Notes :
- NAS5-29293
- Publication Type :
- Report
- Accession number :
- edsnas.19910066713
- Document Type :
- Report
- Full Text :
- https://doi.org/10.1086/191598