Optical R-band photometry of TeV BL Lac objects: 1ES1959 + 650 and 1ES2344 + 514
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.
Document Type: Research Article
Publication date: August 1, 2003