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\IBVShead{4960}{12 October 2000}

\IBVStitle{2000 BVR Photometry of FK Comae}

\IBVSauth{Ta\c{s}, G.; Evren, S.}

\IBVSinsto{Ege University Observatory, 35100 Bornova, \.Izmir, Turkey\\ \indent
e-mail: tas@alpha.sci.ege.edu.tr, sevren@astronomy.sci.ege.edu.tr}

\SIMBADobjAlias{FK Com}{HD 117555}

\begintext

\IBVSTnam{FK Com = BD\,+24\deg2592 = HD 117555}

\IBVSTcoo{13\hr 30\mm 46\fsec80}{24\deg 13\farcm96}{2000}

\IBVSTobs{Ege University Observatory, 48-cm Cassegrain telescope}

\IBVSTdet{Hamamatsu, R4457 (PMT)}

\IBVSTfil{$B$, $V$ and $R$ filters of Johnson $UBVR$ system}

\IBVSTcomp{BD\,+24\deg 2593}

\IBVSTchk{BD\,+25\deg 2643}

\IBVSTdata{Upon request}

\IBVSTtyp{ FK }

\IBVSTrem{
The 2000 observations of FK Com were carried out between February 07
and June 27, 2000. 212 data points in each filter were obtained during
15 nights. The light elements are taken from Jetsu et al.\ (1993).  The
mean light and colour curves obtained in three colors ($B$, $V$, $R$)
are shown in Figure~1. Circles and squares represent the nightly means
obtained between February 7 and June 7, 2000, and between June 16 and
June 27, 2000, respectively. As it can be seen from Figure~1, the
minimum of the light curve obtained in $V$ filter was shifted from
phase 0.81 to phase 0.66 (about 54\deg\ in the longitude).  At the same
time, the amplitude of the $V$-light curve changed; it increased from
0\fmm 11 to 0\fmm 15 in $V$ band. In Figure~2 the colour index
variations obtained in the colour indices $B-V$ and $V-R$ are shown.  The
symbols are the same as in Figure 1. While the shift of the minimum of
the wave-like distortion on the light curve of FK Com is obvious, it is
not possible to see this behaviour on the colour index curves.}

\strut
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\IBVS2fig{7cm}{4960-f1.ps}{The $B$, $V$, $R$ light curves obtained in 2000 of FK Com}{4960-f2.ps}{The $B-V$ and $V-R$ colour curves obtained in 2000 of FK Com}

\reference

Jetsu, L., Pelt, J. and Tuominen, I., 1993, {\it A\&A}, {\bf 278}, 449

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