Abstract
We have identified three BL Lacertae objects in the Palomar-Green Survey which were previously misclassified as DC white dwarfs, namely PG 1246 + 586, PG 1424 + 240, and PG 1437 + 398. Our reclassification is based on the detection of these objects as x-ray sources in the ROSAT all-sky survey and upon our subsequent detection of intrinsic linearly polarized and variable optical emission from these sources. As a result of the ROSAT survey, the number of identified BL Lac objects in the Palomar-Green catalog of UV excess objects has been doubled. Corrected optical positions are presented for PG 1246 + 586 and PG 1437 + 398.
Original language | English (US) |
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Pages (from-to) | 1729-1733 |
Number of pages | 5 |
Journal | Astronomical Journal |
Volume | 106 |
Issue number | 5 |
DOIs | |
State | Published - Nov 1993 |
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science