Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344608s&link_type=abstract
American Astronomical Society, AAS Meeting #213, #446.08; Bulletin of the American Astronomical Society, Vol. 41, p.332
Astronomy and Astrophysics
Astronomy
Scientific paper
BVRI data from November 1999 through June 2008 was compiled in order to monitor the long-term optical spectrum of BL Lac. Spectral slopes were calculated for approximately 35 nights, using either BVR or VRI data. Slope-versus-V-magnitude figures were constructed to explore possible correlations. Spectral flattening with increase in V-magnitude was found for both BVR and VRI data sets, but with a small correlation coefficient. Ten of the 35 data sets were tested for microvariability, with only two testing positive. No correlation was found between magnitude and occurrence of microvariations or between spectral slope and microvariations. We show that there is only one synchrotron component in the optical range.
This projected was funded by a partnership between the National Science Foundation (NSF AST-0552798), Research Experiences for Undergraduates (REU), and the Department of Defense (DoD) ASSURE (Awards to Stimulate and Support Undergraduate Research Experiences) programs.
Storch Laura
Webb John
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