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\begin{document}
\IBVShead{4898}{2 May 2000}
\IBVStitle{New Variable Stars in Lyra and Cygnus}
\IBVSauth{Dahlmark, Lennart}
\IBVSinsto{Residence Jeanne d'Arc, 176 Avenue Majoral Arnaud,
           F-04100\enskip Manosque, France}

\begintext

     This report summarizes the results of a variable-star search in the
20\deg$\times$15\deg\,area centered at 19\hr00\mm/+45\deg\,(1950).

     Eighteen yellow/blue plate pairs (Kodak 103a-D + GG11 filter and 103a-O
unfiltered) were exposed between 1967 and 1982, and forty-three films (Kodak
TechPan 4415 + GG495 filter) taken in the years 1987 to 2000.  Four exposures
with a 200/210/300mm Schmidt camera taken 1995--1999 on TechPan without a
filter were also examined and used to prepare finding charts.  Ten plate or
film pairs were scanned for variables with a blink comparator and with four
stereo comparators used in tandem.  Magnitudes were determined in a
stereomicroscope using comparison stars taken from the Guide Star Catalogue
(Lasker {\it et al}. 1990) and the Guide Star Photometric Catalogue
(Lasker {\it et al}. 1988). The yellow-light magnitudes `m$_v$' shown in
Table 2 are thus tied to the GSC (northern) magnitude scale and will be
systematically somewhat brighter than standard Johnson V.

     In this field twenty-five new variables were found.  Five previously
published variables without elements (Dahlmark 1982, Skiff \& Williams 1997)
were also examined to assess their lightcurves.  Finally seven designated but
poorly-studied stars were included in the work.  Table 1 shows positions and
identifications for the new stars.  The coordinates were drawn either from the
GSC-ACT (Gray 1999) or USNO--A2.0 catalogue (Monet {\it et al}. 1998); two 
appear in no catalogue and were estimated ($\pm$2\arcs) using the Digitized Sky
Survey via the Goddard SkyView facility.  The source of the positions is coded
in column `s' as follows:  A = USNO--A2.0, G = GSC-ACT, S = SkyView.

     About half the variables have been recently identified by the ROTSE
survey (Akerlof {\it et al}. 2000), and these names are given as well.  The
ROTSE positions are not as good as those given below.  Except for one
short-period variable, no lightcurve information was supplied, so the present
results extend our knowledge of these variables.

     The elements of variation are collected in Table 2.  An asterisk by the
star name indicates a note at the bottom of the table.  The lightcurve
determinations are based usually on sixty-five magnitude estimates for each
star.  From these the magnitude range, provisional variability type, epoch of
maximum, and period have been determined.  The column `{\it b--r}' shows star
colors from USNO--A2.0; these are not well calibrated to any standard system,
but serve to indicate in a qualitative way the sorts of stars involved.
\vfil
\eject

\normalsize
\begin{center}
{Table 1:  Positions and identifications \phantom{(}} \\
\begin{tabular}{lrrcccc}
\hline
Name & \multicolumn{2}{c}{RA\quad (2000)\quad Dec}& s & GSC & IRAS & ROTSE1 \\
\hline
\\[-3mm]
LD 342     & 18\hr02\mm28\fsec09 & +50\deg46\arcm27\farcs8 &G& 3536-0110 &            & \\
LD 343     & 18 17 24.60 & +42 36 16.2 &A&           & 18158+4235 & J181724.82+423614.8 \\
LD 344*    & 18 21 48.43 & +51 24 20.6 &G& 3537-1908 &F18206+5122 & J182148.31+512419.2 \\
LD 345     & 18 31 13.83 & +46 58 34.7 &G& 3530-2757 &            & \\
LD 346*    & 18 49 43.41 & +40 57 49.6 &G& 3122-2898 & 18480+4054 & \\
LD 347     & 19 05 33.82 & +39 20 04.3 &G& 3120-1794 &            & \\
LD 348*    & 19 15 20.63 & +39 58 49.2 &G& 3125-1819 &F19136+3953 & J191520.86+395900.7 \\
LD 349*    & 19 18 54.46 & +43 49 26.0 &G& 3133-0385 &            & J191853.61+434930.0 \\
LD 350     & 19 19 55.01 & +40 52 40.1 &G& 3125-0632 &            & \\
LD 351*    & 19 28 38.98 & +45 05 51.9 &G& 3543-1107 & 19271+4459 & J192838.56+450547.1 \\
LD 352     & 19 30 32.95 & +48 03 25.4 &A&           & 19291+4757 & J193032.71+480327.0 \\
LD 353     & 19 31 43.56 & +41 25 38.3 &A&           &            & J193143.45+412537.9 \\
LD 354*    & 19 33 10.56 & +38 58 33.6 &A&           & 19314+3851 & J193310.27+385830.6 \\
LD 355     & 19 35 23.09 & +48 03 00.8 &G& 3560-1804 &            & \\
LD 356     & 19 37 38.50 & +49 07 50.8 &G& 3564-2375 & 19362+4900 & J193738.09+490751.9 \\
LD 357*    & 19 39 08.50 & +43 23 49.6 &G& 3147-1366 & 19375+4316 & J193908.32+432345.2 \\
LD 358     & 19 42 06.64 & +38 03 37.1 &A&           & 19403+3756 & \\
LD 359*    & 19 42 08.44 & +47 22 57.3 &A&           & 19406+4715 & \\
LD 360     & 19 43 08.74 & +41 34 14.1 &G& 3144-0947 & 19414+4126 & \\
LD 361*    & 19 44 15.69 & +39 11 12.2 &A&           &            & \\
LD 362     & 19 47 15.81 & +44 27 07.0 &A&           &            & \\
LD 363*    & 19 47 58.82 & +38 45 54.5 &A&           & 19462+3838 & \\
LD 364*    &19 49 26.3~\,&+37 31 59~~\,&S&           & 19476+3724 & \\
LD 365     & 19 52 06.73 & +43 31 08.1 &G& 3149-1648 &            & \\
LD 366     & 19 59 38.99 & +47 31 33.1 &A&           & 19581+4723 & \\
           &             &             & &           &            & \\
V352 Lyr   & 18 52 17.06 & +42 09 49.0 &A&           & 18507+4206 & \\
V396 Lyr   & 18 59 50.68 & +45 21 39.9 &G& 3541-1654 &            & \\
EQ Lyr     & 19 19 02.63 & +41 06 34.5 &A&           &            & \\
V1253 Cyg  & 19 18 57.04 & +44 57 24.5 &A&           &            & J191857.81+445729.8 \\
V1503 Cyg  & 19 19 53.33 & +43 45 44.1 &G& 3133-0201 & 19183+4340 & J191953.20+434541.0 \\
V754 Cyg   & 19 42 49.75 & +51 52 50.8 &G& 3569-0766 & 19415+5145 & J194249.75+515247.1 \\
IR Cyg     &19 47 15.7~\,&+37 50 43~~\,&S&           &            & \\
\hline
\end{tabular}
\end{center}

Notes:

\begin{tabular}{ll}
\\[-3mm]
LD 344  & StM 431 (M7).  \\
LD 346  & StM 439 (M7e).  \\
LD 348  & ROTSE1 Dec in error; in a line of four stars.  \\
LD 349  & ROTSE1 RA in error; also 1RXS J191854.7+434927; eastern star of two. \\
LD 351  & east-northeastern star of two.  \\
LD 354  & northeastern component of a close pair.  \\
LD 357  & southern of two stars.  \\
LD 359  & northwestern of two stars.  \\
LD 361  & southern star of a pair.  \\
LD 363  & westernmost star of a trio.  \\
LD 364  & eastern of pair.  \\
\end{tabular}
\vfil
\eject

\begin{center}
{Table 2:  Elements of variation \phantom{(}} \\
\begin{tabular}{lcrrlcrl}
\hline
Name & \multicolumn{2}{c}{max\quad\enskip min} & {\it b--r} & type &    epoch    & period & Remarks \\
     & \multicolumn{2}{c}{(m$_v$)}                &            &      & JD~2400000+ & (days)  \\
\hline
\\[-3mm]
LD 342    & 13.5 & 14.4 &--0.2 & Ia &         &     &  \\
LD 343    & 11.1 & 15.8 &  1.3 & M  & 51444   & 270 &  \\
LD 344    & 10.8 & 12.6 &  2.8 & Lb &         &     &  \\
LD 345*   & 11.4 &$>$14.8 &  2.5 & E  &         &     &  \\
LD 346    & 12.2 & 14.2 &  2.7 & Lb &         &     &  \\
LD 347*   & 12.3 & 13.4 &  0.6 & E  & 51101   & 307?&  \\
LD 348    & 11.0 &$>$16.0 &  2.5 & M  & 51069   & 247 &  \\
LD 349    & 12.2 & 14.0 &  1.3 & RS? &         &     &  \\
LD 350    & 12.5 & 14.0 &  2.7 & M: & 51456   & 221 &  \\
LD 351    & 12.1 &$>$16.0 &  3.1 & M  & 50596   & 320 &  \\
LD 352    & 11.6 & 15.2 &  3.7 & M  & 50691   & 313 &  \\
LD 353    & 12.4 & 15.0 &  3.0 & M  & 51500   & 191 &  \\
LD 354    & 11.9 & 14.2 &  1.5 & M: & 51450   & 361 &  \\
LD 355*   & 13.8 & 14.6 &  0.3 & E  & 51513.3 &25.81?&  \\
LD 356    & 11.8 & 16.0 &  4.3 & M  & 51158   & 404 &  \\
LD 357    & 12.2 & 13.9 &  2.9 & SR & 51542   & 189 &  \\
LD 358    & 12.2 & 14.2 &  2.6 & SR & 51101   & 305?&  \\
LD 359    & 11.8 & 15.5 &  5.0 & M  & 51287   & 455 &  \\
LD 360    & 12.6 & 14.7 &  2.8 & SR & 51406   & 292 &  \\
LD 361    & 12.0 & 14.8 &  5.9 & M  & 51406   & 339 &  \\
LD 362    & 13.2 & 14.7 &  2.8 & Lb &         &     &  \\
LD 363    & 11.8 & 13.7 &  5.8 & M: & 51570   & 405 &  \\
LD 364*   & 12.5 & 14.0 &      & L  &         &     &  \\
LD 365    & 11.5 & 13.5 &  3.0 & L  &         &     &  \\
LD 366    & 12.0 &$>$16.1 &  5.0 & M  & 51285   & 435 &  \\
          &      &      &      &    &         &     &  \\
V352 Lyr* & 12.0 &$>$15.0 &  3.9 & M  & 51406   & 351 &  \\
V396 Lyr* & 12.5 & 15.3 &  2.3 & SR & 51432   & 229 &  \\
EQ Lyr    & 11.5 & 15.0 &  2.6 & M  & 51418   & 305 &  \\
V1253 Cyg*& 11.8 &$>$15.0 &  2.5 & SR &         &     &  \\
V1503 Cyg & 11.4 & 15.5 &  2.7 & M  & 51542   & 311 &  \\
V754 Cyg  & 11.3 & 13.4 &  3.0 & Lb &         &     &  \\
IR Cyg    & 12.0 & 15.5 &      & L  &         &     &  \\
          &      &      &      &    &         &     &  \\
NSV 24916 & 11.8 & 14.8 &      & M  & 51456   & 253 & LD 8  \\
NSV 24928 & 11.8 & 13.5 & 1.5  & Lb &         &     & LD 9  \\
NSV 24935*& 11.4 & 14.6 & 1.6  & M  & 51158   & 301 & LD 10  \\
NSV 24955 & 11.0 & 15.0 & 1.4  & M  & 51608   & 212 & LD 11  \\
NSV 24962 & 11.4 & 15.2 & 1.5  & M  & 50637   & 324 & LD 12  \\
NSV 24994 & 13.2 &$>$16.0 &      & L  &         &     & LD 14  \\
\hline
\end{tabular}
\end{center}

Notes:

\begin{tabular}{ll}
\\[-3mm]
LD 345    & constant on all plates at m$_v$=11.4 except $>$14.7 on: \\
          & JD 2441512.5, 2441892.5, and 2442210.5.  \\
LD 347    & five minima observed.  \\
LD 349    & `cepheid' with 4\fday123 period and full amplitude of 0\fmm63 \\
          & in ROTSE1 list, but only larger, irregular variations seen here. \\
          & The x-ray detection suggests this is probably an RS CVn type star. \\
LD 355    & five minima observed.  \\
LD 364    & as faint as B $\sim$19 on three overlapping POSS-II J plates.  \\
V352 Lyr  & range 14.0 $<$ mb $<$ 17.5, period 331\fday43 (Gushchin 1994).  \\
V1253 Cyg & 188-226\day?  \\
V396 Lyr  & mode-switching 176/318\day?  \\
NSV 24935 & CSS 1172.  \\
\end{tabular}

\vfil
\eject

\large

     I would like to thank Gerhard Klaus (Grenchen, Switzerland), who has
provided me for many years with finding charts and magnitudes from the GSC for
each of my variables.  Brian Skiff (Lowell Observatory) has checked the
coordinates and identifications, and has prepared the material for publication.
The ROTSE stars were located via Taichi Kato's handy `newvar' list (Kato 2000).


\references

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Dahlmark, L., 1982, {\it IBVS}, No.\,2157  % \BIBCODE {1982IBVS.2157....1D}

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Gushchin, I. A., 1994, {\it Perem. Zvezdy}, {\bf 23}, 334 

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{\bf 68}, 1  

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Monet, D., Bird, A., Canzian, B., Harris, H., Reid, N., Rhodes, A., Sell, S.,
Ables, H., Dahn, C., Guetter, H., Henden, A., Leggett, S., Levison, H.,
Luginbuhl, C., Martini, J., Monet, A., Pier, J., Riepe, B., Stone, R.,
Vrba, F., Walker, R., 1998, USNO--A2.0; U.S. Naval Observatory, Washington DC;
see also {\tt http://www.nofs.navy.mil}

Skiff, B. A., and Williams, G.V., 1997, {\it IBVS}, No.\,4448  % \BIBCODE {1997IBVS.4448....1S}

\endreferences

% Figure omitted from the originally published version

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