Three new BL Lacertae objects in the Palomar-Green survey

Details Three new BL Lacertae objects in the Palomar-Green survey Three new BL Lacertae objects in the Palomar-Green survey

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1729f&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 5, p. 1729-1733

Astronomy and Astrophysics

Astronomy

38

Bl Lacertae Objects, Light Emission, Linear Polarization, Sky Surveys (Astronomy), Ultraviolet Spectra, White Dwarf Stars, X Ray Sources, Astronomical Catalogs, Astronomical Polarimetry, Astronomical Spectroscopy, Helium, Rosat Mission, Stellar Atmospheres

Scientific paper

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.

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