A study of Einstein Observatory fields with a CCD camera
Abstract
Photometry at R and I wavelengths obtained with a 100 x 100 pixel CCD camera for fields containing X-ray sources discovered by the Einstein X-ray Observatory is presented. One field contains an anonymous distant cluster of galaxies for which an approximate redshift is reported. In two of the three Draco fields, faint sources are found having stellar appearance but anomalous colors that may be extremely red quasars or BL Lac objects.
- Publication:
-
The Astronomical Journal
- Pub Date:
- February 1980
- DOI:
- Bibcode:
- 1980AJ.....85..121S
- Keywords:
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- Astronomical Photometry;
- Charge Coupled Devices;
- X Ray Sources;
- Bl Lacertae Objects;
- Infrared Astronomy;
- Quasars;
- Red Shift;
- Visual Photometry;
- Astronomy