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\IBVShead{4814}{29 November 1999}

\IBVStitletl{Astrometry and Confirmation of Variability}{ of 21 NSV Objects }

\IBVSauth{Yoshida, S.$^1$; Kadota, K.$^2$; Kato, T.$^3$}

\IBVSinst{MISAO Project, 1065-16 Miyawada Fujishiro-machi Kitasoma-gun Ibaraki 300-1514, Japan,\\ \indent e-mail: seiichi@muraoka.info.waseda.ac.jp}
\IBVSinst{MISAO Project, 77-1-3-12-204 Koshikiya Ageo City Saitama 362-0064, Japan,\\ \indent e-mail: kenic-k@astroarts.co.jp}
\IBVSinst{Dept.\ of Astronomy, Kyoto University, Kyoto 606-8502, Japan, e-mail: tkato@kusastro.kyoto-u.ac.jp}

\IBVSabs{This report describes the astrometry and confirmation of variability of}
\IBVSabs{21 suspected variable stars in the NSV catalog discovered in the course}
\IBVSabs{of variable star survey based on the MISAO Project observations.}

\begintext

This report describes the astrometry and confirmation of variability of 21 suspected variable stars in the NSV catalog (New Catalogue of Suspected Variable Stars) discovered in the course of variable star survey based on the MISAO Project observations.

The astrometry and photometry of these objects were obtained automatically by the PIXY system from unfiltered CCD images taken by Kadota between 1999 April and August. Further details are the same as described in Yoshida and Kadota (1999).

Table 1 shows the astrometry, photometry and identifications. The positions and magnitudes are measured using USNO-A1.0 catalog. The magnitude is based on a preliminary $V$ magnitude calculated from $R$ and $B$ magnitude in the catalog based on Kato's (1998) equation:
\[
V = R + 0.375 (B - R).
\]

No other variable stars were found on our CCD images within 5 arcmin of the catalog positions of NSV 08100, NSV 09883, NSV 09955, NSV 11617, NSV 12626, NSV 12708, and NSV 12736, except for the stars in Table 1. Therefore, we concluded that our objects are identified with these NSV objects.

At the catalog position of NSV 12621, there is a star USNO-A2.0 1200.13947075. But it was nonvariable at 12.5 mag on our images. Our variable star at R.A. 19\hr57\mm29\fsec99, Decl.\ +36\deg00\arcm38\farcs0 (2000.0) is only 23 arcsec from USNO-A2.0 1200.13947075. Therefore, we concluded that our variable object is the true NSV 12621.

The variable star at R.A. 17\hr59\mm00\fsec73, Decl. $-11\deg 33\arcm 23\farcs 0$ (2000.0) is 4.0 arcmin from the catalog position of NSV 09938. No other variable stars were found on our CCD images within 5 arcmin of
the catalog position. Our object is identified with an S-type star GCSS 1011 (Stephenson 1984). The spectral type S given for NSV 09938 indicates this star is indeed NSV 09938.

V1462 Cyg is within 2 arcmin from NSV 12600. No other variable stars were found on our CCD images within 5 arcmin of the catalog position of NSV 12600. Therefore, we concluded that NSV 12600 is identified with V1462 Cyg.

NSV 24955 is identified with LD 11 (Dahlmark 1982).

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{\normalsize Table 1: Astrometry and Identifications}
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\begin{tabular}{cllrrl}
\hline
& & & \multicolumn{2}{c}{Unfiltered} \\
Star & \multicolumn{2}{c}{R.A. (J2000.0) Decl.} & \multicolumn{2}{c}{CCD Mag.} & Identified with \\
& & & Max & Min \\
\hline
NSV 08100 & 17\hr00\mm41\fsec19  & $-$24\deg20\arcm05\farcs3 & 10.2 & 11.4 & \\
NSV 08134 & 17 03 11.389 & $-$26 00 42.17 & 11.8 & 13.1 & USNO-A2.0 0600.23365400 \\
NSV 09883 & 17 56 59.097 & $-$17 28 35.84 & 12.6 & 13.5 & USNO-A2.0 0675.23531725 \\
NSV 09938 & 17 59 00.73  & $-$11 33 23.0  & 11.2 & 12.6 & GCSS 1011 \\
NSV 09955 & 18 00 06.57  & $-$16 01 26.1  & 12.0 & 13.7 & \\
NSV 09956 & 17 59 59.759 & $-$10 40 21.96 & 11.5 & 12.3 & GSC 5678.0922 \\
\multicolumn{5}{c}{} & USNO-A2.0 0750.12477306 \\
NSV 09966 & 18 00 09.828 & +01 44 40.89 & 11.6 & 12.6 & GSC 0430.0454 \\
\multicolumn{5}{c}{} & USNO-A2.0 0900.11191505   \\
NSV 11594 & 18 58 03.436 & $-$08 17 11.10 & 10.8 & 11.6 & USNO-A1.0 0750.15900167 \\
NSV 11612 & 18 59 12.08  & $-$05 36 27.6  & 11.5 & [14.7 & \\
NSV 11617 & 18 59 09.171 & +10 23 39.55 & 11.2 & 12.0 & USNO-A2.0 0975.13787358 \\
NSV 12600 & 19 56 45.987 & +36 42 52.52 & 11.3 & 12.5 & USNO-A2.0 1200.13896449 \\
NSV 12621 & 19 57 29.99  & +36 00 38.0  & 13.7 & [15.1 & \\
NSV 12626 & 19 57 41.076 & +35 47 09.14 & 11.7 & 14.0 & USNO-A2.0 1200.13959781 \\
NSV 12669 & 19 59 46.62  & +37 02 02.1  & 11.8 & 14.1 & \\
NSV 12708 & 20 01 18.002 & +36 47 42.80 & 13.1 & [15.5 & USNO-A2.0 1200.14186977 \\
NSV 12730 & 20 02 08.46  & +37 16 34.4  & 11.2 & 12.0 & GSC 2682.2437 \\
NSV 12736 & 20 02 41.160 & +36 03 30.00 & 13.3 & 14.7 & USNO-A2.0 1200.14267998 \\
NSV 14012 & 22 03 31.385 & +60 09 33.97 & 12.3 & 13.3 & USNO-A2.0 1500.08723858 \\
NSV 24955 & 19 58 28.24  & +47 06 11.0  & 11.3 & 13.2 & LD 11 \\
NSV 24959 & 19 59 29.77  & +22 45 13.7  & 13.1 & 15.1 & \\
NSV 25407 & 20 57 21.47  & +37 55 19.3  & 12.7 & 14.7 & \\
\hline
\end{tabular}
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\references

Dahlmark, L., 1982, {\it IBVS}, No.\ 2157

Kato, T., 1998, \\ {\tt http://www.kusastro.kyoto-u.ac.jp/vsnet/Mail/vsnet-chat/msg00700.html}

Yoshida, S., Kadota, K., 1999, {\it IBVS}, No.\ 4746

Stephenson, C. B., 1984, General Catalogue of Galactic S Stars

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