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\input ibvs2.sty
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\IBVShead{5756}{12 February 2007}

\IBVStitletl{Long-Term Optical Light Variations}{ of the Peculiar Massive Runaway Star HD 108}

\IBVSauth{Barannikov, A.A.$^{1,2}$}

\IBVSinst{Sternberg Astronomical Institute, University Avenue 13, 119899
Moscow, Russia, \\ e-mail: albardon@mail.ru}

\IBVSinst{South-Russia State University of Economics and Service,
Shevchenko str.\ 147, Shakhty 346500,\\ Rostov region, Russia, 
e-mail: albar@sssu.ru}

\SIMBADobj{HD 108}

\IBVSabs{The results of seventeen-year-long observations of}
\IBVSabs{three-colour BVR-photoelectric photometry of the}
\IBVSabs{peculiar Ofp star HD 108 are reported. New}
\IBVSabs{observations show a steady decrease of optical}
\IBVSabs{light during last 10 years.}

\begintext

\IBVSTnam{HD~108 = NSV~25 = SAO~10973 = BD+62\deg 2363}

\IBVSTcoo{00\hr 06\mm 03\fsec3861}{+63\deg 40\arcm 46\farcs763}{2000}

\IBVSTobs{Crimean Laboratory, Sternberg Astronomical Institute,
60-cm Cassegrain telescope}

\IBVSTdet{photometer: one channel}

\IBVSTfil{$BVR$}

\IBVSTdateobs{1989.07/2006.08}

\IBVSTcomp{HD~134}

\IBVSTsysn

\IBVSTdata{upon request}

\IBVSedata{5756-t1.txt}
\IBVSdataKey{5756-t1.txt}{HD 108}{photometry}
% Added Thu Feb 22 08:58:22 MET 2007

\IBVSTrem{HD~108 is a well-known Ofp star which is placed in a list of
runaway stars by Bekenstein \& Bowers (1974) with a peculiar velocity
$V_p>98$ km/s and the height above the Galactic plane $z = 80$~pc
(Cruz-Gonzalez et al., 1974; Stone, 1979). The star belongs to the
association Cas~$OB5$ (Humphreys, 1978). One of the interesting aspects of
investigation of the star is its long-term optical variability which has
been found by Barannikov (1999). According to the newest observation data
the brightness of the star was constant from 1989 until 1994, then, it
began to decline monotonically till now (Fig.~1). Total amplitude of
brightness diminution reached $\sim 0\fmm06$. Variations of colour indexes
$B-V$ and $V-R$ were small (Fig.~2). This result confirms independent
deductions about long-term variability of HD~108 in the optical domain
(Naz\'e et al., 2004).}

\IBVSfig{20cm}{5756-f1.eps}{Long-term light curves of HD~108 in the $B$,
$V$ and $R$ bands (yearly averages)}
\IBVSfigKey{5756-f1.eps}{HD 108}{light curve}

\IBVSfig{16cm}{5756-f2.eps}{Long-term colour curves of HD~108
(yearly averages)}
\IBVSfigKey{5756-f2.eps}{HD 108}{colour curve}

\IBVSTack{The author thanks for the hospitality of A. Merkulova for the
help in the observations at Crimean Laboratory of Sternberg Astronomical
Institute.}

\reference

Barannikov, A.A., 1999, {\it AstL}, {\bf 25}, 169

Bekenstein, J.D., Bowers, R.L., 1974, {\it ApJ}, {\bf 190}, 653

Cruz-Gonzalez, C., Recillas-Cruz, E, Costero, R., et al., 1974, {\it
RevMexAA}, {\bf 1}, 211

Humphreys, R.M., 1978, {\it ApJSS}, {\bf 38}, 309

Naz\'e, Y., Rauw, G., Vreux, J.-M., De Becker, M., 2004, {\it A\&A}, {\bf
417}, 667

Stone, R.C., 1979, {\it ApJ}, {\bf 232}, 520

\endreferences

\end{document}
