\documentstyle[epsf]{article} 
 
\input ibvs2.sty 
\begin{document} 
\IBVShead{4505}{11 August 1997} 
 
\IBVStitletl{NEW VARIABLES IN THE FIELDS OF V1413 AQUILAE}{ AND AU HERCULIS} 
 
\IBVSauth{Laurel A.\ Brown$^1$, Priscilla J.\ Benson$^2$} 
\IBVSinst{Colgate University, Hamilton, NY, USA 
[labrown@colgate.edu]}  %email

\IBVSinst{Wellesley College, Wellesley, MA, 02181, USA 
[pbenson@wellesley.edu]}   %email

 
\vskip 8mm 

\IBVSabs{Discovery of two new variable stars is reported.}

\SIMBADobj{V1413 Aql}
\SIMBADobj{GSC 1585-1087}
\SIMBADobj{AU Her}
\SIMBADobj{GSC 2102-1349}
\IBVSkey{photometry, CCD}
 
\begintext 
 
During the observation and data analysis of the variable stars V1413 
Aquilae and AU Herculis, previously unknown possible variables were 
found in each field.  We used Pickles and the Guide Star Catalog to 
obtain the positions of the new variables; the coordinates of the 
possible new variable (Guide Star Catalog \#1585 1087) in the V1413 
Aquilae field are $\alpha_{2000} = 19\hr 03\mm 46\sec$, 
$\delta_{2000} = 16\deg 29'52''$.  The coordinates of the possibly 
varying star (Guide Star Catalog \#2102 1349) in the AU Herculis field 
are $\alpha_{2000} = 17\hr 56\mm 59\fsec 6, 
\delta_{2000} = 29\deg 47'14\farcs 8$.  Neither star is listed as a 
suspected or known variable in the New Catalogue of Suspected Variable 
Stars (Kholopov {\it et al}., 1982), SIMBAD, or any issues of the 
Information Bulletin on Variable Stars from 1993 to the present, 
including the 72nd Name-List of Variable Stars (IBVS No.\ 4140, 1995). 
Thus, we conclude the stars have not previously been noted as variables. 
 
All observations of both new variables were made with a Photometrics CCD 
camera attached to the Wellesley College 0.6 meter Cassegrain Reflecting 
telescope.  AU Herculis has been observed and analyzed since the summer 
of 1993, and V1413 Aquilae has been observed since the summer of 1994. 
It was noticed during the analysis of both stars that one of the 
comparison stars in each of the fields was showing a larger variation of 
magnitude than the other comparison stars. 
 
The new variable in the AU Herculis field varies by approximately 0.5 
magnitudes in both the R and the V filters.  This is compared to the 
significantly smaller variation of approximately 0.09 and 0.07 
magnitudes shown by the other comparison stars in the R and V filters. 
The new variable in the field of V1413 Aquilae varies in magnitude by 
approximately 0.3 magnitudes in the I filter, 0.4 magnitudes in the R 
filter, and 0.5 magnitudes in the V filter.  The other comparison stars 
in this field vary by approximately 0.07 in the I filter, 0.15 in the R 
filter, and 0.09 in the V filter.  Figures 1 and 2 show the variations 
of the star in the field of AU Herculis in the V filter and. the 
variation of the star in the V1413 Aquilae field in the I filter 
respectively.  Figures 3 and 4 identify the new variable stars.  For 
each image, north is up and the field is about nine arcminutes square. 
 
\IBVSfig{8cm}{4505-f1.eps}{V Light Curve of the New Variable in 
the AU Herculis field}

\IBVSfig{8cm}{4505-f2.eps}{I Light Curve of a New Variable in the 
V1413 Aquilae field}
 
\IBVSfig{8cm}{4505-f3.eps}{A finder chart for the new 
suspected variable star in the field of AU 
Herculis}
 
\IBVSfig{8cm}{4505-f4.eps}{A finder chart for
the new suspected variable star in the 
field of V1419 Aquilae} 
 
The two new variables were examined for periodicity using a Fourier 
transform period fitting program written by Charles Prosser of the 
Harvard Center for Astrophysics.  No likely periods were found between 
0.2 and 400 days. 
 
We thank the W.\ M.\ Keck Foundation for a summer internship (LAB) and 
support of astronomy at Wellesley College through the Keck Northeast 
Astronomy Consortium.  This research was also partially supported by 
funds from the National Science Foundation (AST9417359), and the 
Wellesley College Brachman Hoffman Fellowship (PJB).  This research has 
made use of the Simbad database operated at CDS, Strasbourg, France. 
 
 
\references 
Kazarovets, E.V.\ and Samus, N.N., 1995, {\it IBVS},  No.\ 4014 
 
Kholopov, P.N., 1985, {\it General Catalog of Variable Stars}, Moscow 
 
Kholopov, P.N., 1982, {\it New Catalogue of Suspected Variable Stars}, 
Moscow 
 
Space Telescope Science Institute, 1992, {\it The Guide Star Catalog v1.1}, 
Baltimore 
 
\end{document} 
 
 
