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\input ibvs2.sty

\begin{document}

\IBVShead{5518}{2 April 2004}

\IBVStitletl{28 New Variable Stars from SAVS}

\IBVSauth{Maciejewski, Gracjan; Czart, Krzysztof; Niedzielski, Andrzej}

\IBVSinsto{Centrum Astronomii, Uniwersytet Miko{\l}aja Kopernika,
Pl-87100 Toru\'n, Poland;\\ e-mail: {\tt gm,kczart,aniedzi@astri.uni.torun.pl}}


\SIMBADobj{GSC 3663-913}
\SIMBADobj{SAVS J004534+561626}
\SIMBADobj{GSC 3663-2412}
\SIMBADobj{GSC 1754-1133}
\SIMBADobj{BD +61 285}
\SIMBADobj{BD +60 265}
\SIMBADobj{GSC 2331-731}
\SIMBADobj{GSC 2331-960}
\SIMBADobj{GSC 2331-1491}
\SIMBADobj{HD 237760}
\SIMBADobj{GSC 3805-1092}
\SIMBADobj{HD 233586}
\SIMBADobj{GSC 3423-745}
\SIMBADobj{BD +26 4227}
\SIMBADobj{GSC 3995-1441}
\SIMBADobj{HD 240017}
\SIMBADobj{GSC 3992-80}
\SIMBADobj{GSC 3996-312}
\SIMBADobj{GSC 3996-574}
\SIMBADobj{GSC 4265-193}
\SIMBADobj{IRAS 22575+3453}
\SIMBADobj{GSC 2750-854}
\SIMBADobj{GSC 2758-1820}
\SIMBADobj{GSC 2759-1917}
\SIMBADobj{GSC 2759-1657}
\SIMBADobj{GSC 2751-1007}
\SIMBADobj{GSC 2752-1159}
\SIMBADobj{GSC 2765-348}


\IBVStyp{  New variables  }

\IBVSabs{Light curves of 28 new variable stars discovered by the}
\IBVSabs{Semi-Automatic Variability Search sky survey are presented. For}
\IBVSabs{some of them the spectral types determined are presented as well.}

\begintext

28 new variable stars were discovered by the Semi-Automatic
Variability Search sky survey (Niedzielski et al. 2003) operating
at the Astronomical Observatory of the Nicolaus Copernicus
University in Piwnice, near Toru\'n. Photometric data were
collected with the semi-automatic CCD camera equipped with a
135/2.8 telephoto lens and SBIG ST-7 CCD camera with KAF 400 chip.
Observations were gathered while monitoring  23 selected fields
covering 138 square degrees of the northern hemisphere between
September 2003 and  January 2004. About 18,000 stars brighter than
13 mag were observed in near-Johnson V band. The list of observed
fields, detailed hardware specification and description of data
reducing software as well as original data are available on
survey's web site {\tt http://www.astri.uni.torun.pl/\~{}gm/SAVS}.

For some of the new variables additional spectral observations
were performed with the 0.9m Schmidt-Cassegrain telescope equipped
with the Richardson spectrograph and a Wright CCD camera. Using
the  600 gr/mm grating we obtained spectra between 3800 and 5800
{\AA} with 2 {\AA}/pix reciprocal dispersion. These spectra, after
standard reduction performed with IRAF\footnote{IRAF is
distributed by the National Optical Astronomy Observatories, which
are operated by the Association of Universities for Research in
Astronomy, Inc., under cooperative agreement with the National
Science Foundation.} were used for spectral classification.

A list of the new variable stars is presented in Table 1. The
stars which variability type cannot be resolved with our
photometric data (mostly long-term red irregular or semi-regular
variables), were classified as ``miscellaneous" and marked with
MISC in Table 1. Light curves in near V filter of new variables
are shown in Figures 1, 2 and 3. For regular periodic variables
phased light curves are displayed. For long-term variables the
data points were averaged over single nights and the standard
deviation was taken as the  near V magnitude error estimate. The
original photometric data are available at the surveys web site.

The medium resolution spectra used for determination of spectral
types of selected variables are presented in Figures 4 and 5 for
early and late spectral types, respectively. Some characteristic
spectral features used in classification are marked.

SAVS 225956+350948 (the infrared source IRAS 22575+3453) was
observed as  gradually fading object changing its brightness from
about $m_{V}=11$ mag at the beginning of monitoring. Near HJD
2452955 it became out of range of our instrument and was not
detected in later CCD frames. It is possible that SAVS
225956+3509483 is a faint variable of Mira type. The higher
resolution spectrum of this star  is shown in Figure 6. It was
obtained with 1200 gr/mm grating covering spectral range between
5800 and 6800 {\AA} (reciprocal dispersion of 1 {\AA}/pix). Strong
$H_{\alpha}$ emission line is clearly visible.

{\small
\begin{center}
{\normalsize {\bf Table 1.} List of new variables. $SAVS$ $ID$ --
identifier consisted of Right Ascension and Declination of a star
calculated for J2000.0, $Other$ $ID$ -- cross-identification with
other catalogs, $m_{V}$ -- observed maximal brightness in
near-Johnson V band, $\Delta$$m_{V}$ -- amplitude of variation,
$N_{data}$ -- number of collected data points (for long-term
variables a number of observed nights are also given), $T_{0}$ --
time of primary minimum for eclipsing binary systems or time of
maximum for periodic pulsating variables (in Heliocentric Julian
Days), $P$ -- period of variation in days, $Type$ -- type of
variability in GCVS (Kholopov et al. 1998) convention.} \vskip 2mm
\begin{tabular}{|clrrrrrr|}
\hline
SAVS ID       & Other ID       & $m_{V}$ &$\Delta$$m_{V}$&$N_{data}$&$T_{0}-2450000$& $P$ [days]    & Type\\
\hline
004430+564550 & GSC 3663-913   &  $9.81$ & $0.18$        & $139/24$ & $3033.2823$   & $57.61(5)$    & SR\\
004534+561626 & C27            & $11.29$ & $0.45$        & $141/24$ & \dots         & \dots         & MISC\\
004611+571305 & GSC 3663-2412  & $10.81$ & $0.32$        & $124/22$ & \dots         & \dots         & MISC\\
012728+290618 & GSC 1754-1133  & $10.79$ & $0.33$        & $200$    & $2929.8486$   & $0.491495(3)$ & EB\\
013237+615811 & BD+61\deg 285  & $ 9.35$ & $0.10$        & $176$    & $2933.0564$   & $0.67410(8)$  & BCEP\\
013333+613329 & BD+60\deg 265  & $ 8.51$ & $0.21$        & $180/31$ & $3155.3509$   & $92.6(6)$     & SR\\
022430+350810 & GSC 2331-731   & $12.14$ & $0.48$        & $210$    & $2931.3523$   & $0.36907(2)$  & EB\\
022708+342319 & GSC 2331-960   & $11.69$ & $0.38$        & $217$    & $2939.1813$   & $ 3.1078(2)$  & DCEP:\\
022841+342948 & GSC 2331-1491  & $10.91$ & $0.34$        & $196/27$ & \dots         & \dots         & MISC\\
085324+564910 & HD 237760      & $ 9.35$ & $0.48$        & $75/14$  & \dots         & \dots         & MISC\\
085744+524727 & GSC 3805-1092  & $10.95$ & $1.40$        & $75/15$  & \dots         & \dots         & MISC\\
085759+524041 & HD 233586      & $10.28$ & $0.29$        & $93/16$  & \dots         & \dots         & MISC\\
085819+522627 & GSC 3423-745   & $10.73$ & $0.97$        & $95/16$  & $3224.0235$   & $101.7(1)$    & SR\\
213927+271556 & BD+26\deg 4227 & $ 9.81$ & $0.20$        & $178/44$ & \dots         & \dots         & MISC\\
223446+581804 & GSC 3995-1441  & $ 9.97$ & $0.31$        & $287$    & $2891.1763$   & $1.955103(5) $& EA\\
223949+583254 & HD 240017      & $ 9.38$ & $0.50$        & $301$    & $2894.2908$   & $3.09209(3)  $& EA\\
224203+580404 & GSC 3992-80    & $10.14$ & $0.19$        & $182/37$ & \dots         & \dots         & MISC\\
224621+595731 & GSC 3996-312   & $11.28$ & $0.27$        & $279$    & $2896.9093$   & $3.0332(1)$   & DCEP\\
224712+595834 & GSC 3996-574   & $12.13$ & $0.34$        & $308$    & $2892.0818$   & $0.425526(2) $& EW\\
224823+602417 & GSC 4265-193   & $12.09$ & $0.64$        & $299$    & $2897.6785$   & $4.27785(2)$  & DCEP\\
225956+350948 & IRAS 22575+3453& $11.03$ & $1.83$        & $126/18$ & \dots         & \dots         & M:\\
230131+304427 & GSC 2750-854   & $10.66$ & $0.40$        & $274$    & $2884.4259$   & $0.471653(3)$ & EA/EB\\
230310+342508 & GSC 2758-1820  & $12.40$ & $0.58$        & $132$    & $2909.3356$   & $0.318833(2)$ & RRAB\\
230623+340932 & GSC 2759-1917  & $11.50$ & $0.48$        & $202/37$ & \dots         & \dots         & MISC\\
230915+341924 & GSC 2759-1657  & $10.93$ & $0.47$        & $215/37$ & \dots         & \dots         & MISC\\
231034+314253 & GSC 2751-1007  & $12.34$ & $0.51$        & $262$    & $2885.2469$   & $0.417461(3)$ & EW\\
232358+313933 & GSC 2752-1159  & $11.49$ & $0.63$        & $239/39$ & $3034.3841$   & $50.11(3) $   & SRD\\
232629+312040 & GSC 2765-348   & $12.04$ & $0.62$        & $277$    & $2905.5446$   & $0.28351(1) $ & EW\\
\hline
\end{tabular}
\end{center}
}

\references

Kholopov, P. N., Samus, N. N., Frolov, M. S., Goranskij, V. P.,
Gorynya, N. A., Karitskaya, E. A., Kazarovets, E. V., Kireeva, N.
N., Kukarkina, N. P., Kurochkin, N. E., Medvedeva, G. I.,
Pastukhova, E. N., Perova, N. B., Rastorguev, A. S., Shugarov, S.
Yu., 1998, {\it The Combined General Catalog of Variable Stars},
4.1 Edition (available via the Internet: {\tt
http://cdsweb.u-strasbg.fr/cgi-bin/Cat?II/214A})

Niedzielski, A., Maciejewski, G., Czart, K., 2003, {\it AcA}, {\bf
53}, 281

\endreferences

\clearpage


\IBVSfig{24cm}{5518-f1.eps}{Light curves of new variables.}
\IBVSfigKey{5518-f1.eps}{}{light curve}

\clearpage

\IBVSfig{24cm}{5518-f2.eps}{Light curves of new variables.}
\IBVSfigKey{5518-f2.eps}{}{light curve}

\clearpage

\IBVSfig{20cm}{5518-f3.eps}{Light curves of new variables.}
\IBVSfigKey{5518-f3.eps}{}{light curve}

\clearpage

\IBVSfig{21cm}{5518-f4.eps}{Spectra of several newly detected variables of
early spectral type.}
\IBVSfigKey{5518-f4.eps}{}{spectrum}

\clearpage

\IBVSfig{21cm}{5518-f5.eps}{Spectra of several newly detected variables of
late spectral type.}
\IBVSfigKey{5518-f5.eps}{}{spectrum}

\clearpage

{\small
\begin{center}
{\normalsize {\bf Table 2.} Journal of spectroscopic observations.
$SAVS$ $ID$ - identifier consisted of RA and Dec (J2000.0),
$Other$ $ID$ - cross-identification with other catalogues, $HJD$ -
heliocentric Julian Date, $Exptime$ - exposure time in seconds,
$\lambda_{1}-\lambda_{2}$ - wavelength range in \AA, $Sp$ $Type$ -
spectral type and luminosity class} \vskip 2mm
\begin{tabular}{|clccccr|}
\hline
SAVS ID       & Other ID       & $Date$ &$HJD-2450000$&$Exptime [s]$&$\lambda_{1}-\lambda_{2}$&$Sp$ $Type$\\
\hline
012728+290618 & GSC 1754-1133  & 2004-01-18 & $3023.36884$  & $1200$ & 3725-5820  & G5   \\
013237+615811 & BD+61\deg 285  & 2004-01-15 & $3020.39014$  & $1200$ & 3725-5820  & B2 V \\
013333+613329 & BD+60\deg 265  & 2004-01-15 & $3020.40665$  & $1200$ & 3725-5820  & K7   \\
213927+271556 & BD+26\deg 4227 & 2004-09-22 & $2905.41351$  & $1200$ & 3790-5845  & M2 III \\
              &                & 2004-09-22 & $2905.42801$  & $1200$ & 3790-5845  & \\
              &                & 2004-09-23 & $2905.51252$  & $1200$ & 5640-7700  & \\
              &                & 2004-09-23 & $2905.52720$  & $1200$ & 5640-7700  & \\
              &                & 2004-01-18 & $3023.22933$  & $1200$ & 3725-5820  & \\
223446+581804 & GSC 3995-1441  & 2004-01-15 & $3020.42474$  & $1200$ & 3725-5820  & O9 V \\
223949+583254 & HD 240017      & 2003-09-22 & $2905.38013$  & $1200$ & 3790-5845  & B5 V \\
              &                & 2003-09-22 & $2905.39436$  & $1200$ & 3790-5845  & \\
              &                & 2003-09-23 & $2905.54437$  & $1200$ & 5640-7700  & \\
              &                & 2003-09-23 & $2905.55868$  & $1200$ & 5640-7700  & \\
              &                & 2004-01-15 & $3020.36355$  & $1200$ & 3725-5820  & \\
224203+580404 & GSC 3992-80    & 2004-01-18 & $3023.30773$  & $1200$ & 3725-5820  &M2 III\\
225956+350948 & IRAS 22575+3453& 2003-10-18 & $2931.37519$  & $1200$ & 5725-6730  & Me III\\
              &                & 2003-10-18 & $2931.39148$  & $1200$ & 5725-6730  & \\
              &                & 2003-10-18 & $2931.51110$  & $1200$ & 3985-5010  & \\
230131+304427 & GSC 2750-854   & 2004-01-18 & $3023.21266$  & $1200$ & 3725-5820  & F5 V \\
230915+341924 & GSC 2759-1657  & 2004-01-18 & $3023.34918$  & $1200$ & 3725-5820  &M5 III\\
231034+314253 & GSC 2751-1007  & 2004-01-18 & $3023.25182$  & $1200$ & 3725-5820  & Ge   \\
232358+313933 & GSC 2752-1159  & 2004-01-18 & $3023.27144$  & $1200$ & 3725-5820  & F5e V\\
\hline
\end{tabular}
\end{center}
}

\IBVSfig{6cm}{5518-f6.eps}{Higher resolution spectrum of IRAS
22575+3453 showing H$\alpha$ emission.}
\IBVSfigKey{5518-f6.eps}{IRAS 22575+3453}{spectrum}

\end{document}
