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Optical R-band photometry of TeV BL Lac objects: 1ES1959 + 650 and 1ES2344 + 514

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Abstract:

We present the results of R-band observations of two TeV BL Lacertae objects 1ES1959 + 650 and 1ES2344 + 514. To study the long-term variability (LTV) intraday variability (IDV) and intrahow variability (IHV) we observed these objects for 72 and 39 nights respectively. The LTV of 1ES1959 + 650 has a magnitude of 0.4, while it is below 0.1 in the case of 1ES2344 + 514. The IDV and IHV of both objects have magnitudes less than 0.01.

The higher activity of 1ES1959 + 650 in comparison with that of 1ES2344 + 514 may be attributed to its higher radio luminosity. A new faint eclipsing binary star with an amplitude of magnitude 0.36 and period of 0.26 days was also identified.

Keywords: 1ES1959 + 650 and 1ES2344 + 514; Active galaxies; BL Lacertae; Quasars

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/10556790310001609106

Affiliations: 1: Abastumani Observatory Abastumani Georgia 383762 2: Politechnical University Tbilisi Georgia 3: Astrophysical Institute of Potsdam An der Sternwarte 16 Potsdam Germany D-14482

Publication date: August 1, 2003

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