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\IBVShead{4824}{6 January 2000}

\IBVStitle{Identification of Variable Stars in Grus}

\IBVSauth{L\'opez, Carlos E.; L\'epez, H\'ector S.}

\IBVSinsto{F\'elix Aguilar Observatory, Benav\'{\i}dez 8175
(oeste) 5407 Marquesado, San Juan, Argentina,\\ \indent e-mail: lopez2283@infovia.com.ar}

\begintext

Following with a program conducted to improve the coordinates of southern
variable and suspected variable stars (L\'opez and Girard 1990, L\'opez and
L\'epez 1993), identifications of confirmed variables in the Grus area are
herein presented.

Considering the charts recommended by the GCVS (Kholopov et al.\ 1985),
we identified the variable stars on the USNO A2.0 catalogue (Monet et al.\ 1998), which was read and displayed on the computer screen using a
program developed by Manek (1999).

The results are presented in two tables. Table 1 lists those variables included in catalogues such as HIPPARCOS (HIP), TYCHO (TYC) (ESA, 1997) or PPM (R\"{o}ser and Bastian, 1991). For these stars we only list the identification number in the respective catalogues. We also added, in the AC column, the AC2000 (Urban et al.\ 1998) catalogue number.

Table 2 lists the positions of the variables we were able to successfully
identify in the USNO A2.0. The first column gives the variable star name
while the positions, as extracted from the USNO A2.0, are listed in the second and third columns. The Guide Star Catalogue (Lasker et al.\ 1990) number is listed in the GSC column. In the fifth column we included an
alternative designation; in general it is the preliminary name used in the
finding chart recommended by the GCVS. Those variables which were also
identified in the AC2000 catalogue are marked with an asterisk (*) and the AC2000 number is given in the Notes to Table 2.

VW Gru and AI Gru deserve a special comment: these stars are not included in the USNO A1.0, USNO A2.0 or the GSC. Therefore, in order to report a better position, we extracted a 15 by 15 arcmin area from the CD-ROM set of the Space Telescope Science Institute Digitized Sky Survey (DSS) centered on VW Gru and AI Gru, respectively. The identification of VW Gru was not easy since it is immersed in the glare of the very bright nearby star $\delta^1$ Gru. Both frames were reduced using standard astrometric procedures taking 8 (for VW Gru) and 9 (for AI Gru) USNO A2.0 stars as
reference frame.

The coordinate improvement may be considered complete since all of the confirmed variables in this constellation (listed in the GCVS) were identified on some of the modern and standard astrometric catalogues.

We would like to express our gratitude to Dr.\ Jan Manek for making
his program available to display both the USNO A1.0 and USNO A2.0 catalogues. Our thanks also go to Dr. Dave Monet for providing a copy of the USNO A1.0 as well as the USNO A2.0 and to Dr.\ Nikolai Samus for many helpful comments and suggestions.

\begin{center}
{\normalsize 
Table 1: Variables in HIP, TYC, PPM, and AC catalogues}
\vskip2mm
\begin{tabular}{ccccc}
\hline
GCVS & HIP & TYC & PPM & AC\\
\hline
S & 110736 \\
T & 110697 & 7996 0175 & 302580 \\
U & & 8423 0607 & 327300 & 3968201 \\
V & & 7990 0646 & 327647 & 3971736 \\
W & 112009 & 8010 1452 & 328513 & 3978615 \\
X & & 8834 0986 & 350978 & 4392562 \\
RS & 107231 & 8428 0217 & 327486 & 3970199 \\
RU & & 7503 0171 & 302597 & 3352943\\
RV & & 8446 0662 & & 3978372 \\
RX & & 8008 0397 & & 3980665 \\
XZ & 112532 & 8004 0149 & 303003 & 3466138 \\
AS & & 8008 1290 & 328839 & 3980945 \\
AW & 110188 & 8442 0285 & 328121 & 3975757 \\
AX & 112750 & 8827 0872 & 350561 & 4389343\\
AY & & 8451 1005 & 328896 & 3981287\\
BC & & 8449 0210 & & 3979005 \\
BK & 110624 & 7996 0016 & 302553 & 3465256 \\
$\beta$ & 112122 & 8446 1644 & 328536\\
$\delta^2$ & 111043 & 8003 1373 & 328309 & 3977116\\
$\pi^1$ & 110478 & 8439 0392 & 328190 & 3976182\\
\hline
\end{tabular}
\end{center}

\vfill

\begin{center} 
{\normalsize
Table 2: Positions and Identifications of Variables in Grus}
\vskip 2mm
\begin{tabular}{lccclc}
\hline
GCVS & \multicolumn{2}{c}{RA\quad (2000)\quad Dec}& GSC & Other
ID & Note\\
\hline
R & 21 48 31.725 & $-$46 54 50.53 & 8437.0206 & HD 207192\\
Y & 22 47 20.060 & $-$47 54 57.67 & 8450.0420 & COD $-$48\deg14311 & *\\
Z & 21 34 37.177 & $-$49 07 28.20 & 8432.0080 & S 5125 & * \\
RR & 21 38 03.568 & $-$44 41 12.23 & 7992.0369 & S 5127 & * \\
RT & 21 51 58.402 & $-$45 59 06.48 & 8437.1538 & S 5133 & * \\
RW & 22 42 06.933 & $-$44 09 11.62 & 8010.1153 & S 5148 & * \\
RY & 23 19 25.561 & $-$40 17 26.40 & 8009.0054 & COD $-$47\deg14285 & * \\
RZ & 22 47 11.923 & $-$42 44 38.65 & 8010.0064 & S 5150 & *\\
SS & 21 28 06.273 & $-$37 09 35.62 & 7486.0124 & AN 331.1933\\
ST & 21 50 58.327 & $-$46 11 46.24 & & S 7472 \\
SU & 21 58 42.128 & $-$42 55 16.37 & 7990.1136 & S 7474 \\
SV & 21 58 49.409 & $-$44 19 29.84 & 7994.0210 & S 7701 & * \\
SW & 21 59 11.047 & $-$44 21 03.62 & 7994.0302 & S 7475 \\
SX & 22 04 21.423 & $-$45 25 05.65 & 8438.1332 & S 7476 \\
SY & 22 04 45.801 & $-$43 42 35.38 & & S 7477 \\
SZ & 22 08 17.848 & $-$42 36 33.22 & & S 7479 \\
TT & 22 10 25.635 & $-$43 41 36.41 & & S 5379 \\
TU & 22 13 36.519 & $-$41 58 15.34 & & S 7482 \\
TV & 22 14 05.715 & $-$43 37 47.14 & & S 7483 \\
TW & 22 15 07.145 & $-$44 50 12.88 & 8002.1612 & S 7484 \\
\hline
\end{tabular}
\end{center}

\eject

\begin{center} 
{\normalsize
Table 2 (cont'd.)}
\vskip 2mm
\begin{tabular}{lccclc}
\hline
GCVS & \multicolumn{2}{c}{RA\quad (2000)\quad Dec}& GSC & Other
ID & Note\\
\hline
TX & 22 16 17.718 & $-$41 40 37.09 & 7999.1253 & S 7485 \\
TY & 22 16 39.440 & $-$39 56 17.79 & 7996.1394 & S 7486 \\
TZ & 22 17 20.538 & $-$50 34 34.93 & 8445.0366 & S 5139 \\
UU & 22 17 46.080 & $-$49 38 16.64 & 8442.0565 & S 6481 \\
UV & 22 19 53.864 & $-$47 41 36.68 & 8442.0056 & S 6483 & * \\
UW & 22 20 13.157 & $-$54 33 28.56 & 8822.0225 & S 7704 & * \\
UX & 22 25 26.275 & $-$46 10 29.17 & 8439.0349 & S 6485 \\
UY & 22 26 20.222 & $-$40 59 29.18 & 7999.0200 & S 7487 \\
UZ & 22 26 55.855 & $-$40 31 43.23 & & S 7488 \\
VV & 22 27 27.177 & $-$49 38 34.79 & 8442.0881 & S 6486 \\
VW & 22 28 57.625 & $-$43 27 24.16 & & S 6488 & see text \\
VX & 22 29 39.407 & $-$49 00 30.71 & 8442.0949 & S 6489 \\
VY & 22 32 30.449 & $-$46 53 13.67 & 8446.1221 & S 6490 \\
VZ & 22 33 50.216 & $-$50 12 23.35 & & S 6492 \\
WW & 22 37 04.227 & $-$47 11 06.59 & & S 6494 \\
WX & 22 42 01.132 & $-$44 32 32.77 & & S 6496 \\
WY & 22 42 51.276 & $-$46 05 12.74 & & S 6497 \\
WZ & 22 44 45.873 & $-$42 21 42.47 & 8007.0676 & S 7706 \\
XX & 22 44 59.352 & $-$50 05 44.04 & & S 6499 \\
XY & 22 46 12.953 & $-$50 00 27.19 & 8453.0294 & S 6500 \\
YY & 22 48 46.579 & $-$50 59 28.06 & 8453.0634 & S 6502 \\
YZ & 22 49 06.198 & $-$44 54 05.04 & & S 6503 \\
ZZ & 22 49 58.209 & $-$47 32 07.19 & 8450.0016 & S 6504 \\
AA & 22 49 55.697 & $-$46 21 28.64 & 8447.1369 & S 6505 \\
AB & 22 51 05.780 & $-$47 18 40.60 & & S 6507 \\
AC & 22 51 49.358 & $-$50 29 31.27 & & S 6508 \\
AD & 22 53 01.695 & $-$44 32 38.71 & & S 6510 \\
AE & 22 55 51.756 & $-$40 40 16.54 & 8008.0818 & COD $-$41\deg15081\\
AF & 22 56 28.970 & $-$47 21 47.92 & 8447.1207 & S 6511 & * \\
AG & 22 58 35.331 & $-$45 13 47.39 & & S 6514 \\
AH & 22 59 11.565 & $-$49 56 13.62 & & S 6515 \\
AI & 22 59 17.462 & $-$43 49 16.54 & & S 6516 & see text\\
AK & 23 05 01.847 & $-$43 56 08.82 & 8011.0120 & S 6520 & *\\
AL & 23 05 44.297 & $-$48 13 45.31 & 8451.0492 & S 6521 \\
AM & 23 05 47.189 & $-$46 43 37.83 & & S 6522 \\
AN & 23 07 55.176 & $-$47 25 40.52 & & S 6526 & *\\
AO & 23 08 10.775 & $-$48 22 08.76 & 8451.1016 & S 6527 \\
AP & 23 14 12.460 & $-$50 39 11.71 & 8454.0048 & S 5157 \\
AQ & 23 22 18.017 & $-$42 05 24.26 & 8016.0800 & S 7711 \\
AR & 22 36 41.659 & $-$38 18 09.09 & 7997.0306 & COD $-$38\deg15133 & *\\
AT & 21 42 38.257 & $-$41 39 34.26 & 7989.0807 & S 7698 & * \\
AU & 22 10 03.821 & $-$42 38 34.46 & 8001.0125 & S 7480 \\
AV & 22 16 35.803 & $-$48 35 02.66 & & S 6480 \\
AZ & 22 35 08.343 & $-$45 17 34.79 & & S 6493 \\
BB & 22 39 27.663 & $-$45 35 29.05 & 8446.0058 & S 6495 \\
\hline
\end{tabular}
\end{center}

\newpage
\begin{center} 
{\normalsize
Table 2 (cont'd.)}
\vskip 2mm
\begin{tabular}{lccclc}
\hline
GCVS & \multicolumn{2}{c}{RA\quad (2000)\quad Dec}& GSC & Other
ID & Note\\
\hline
BD & 22 47 27.550 & $-$50 35 51.43 & & S 6501 \\
BE & 22 50 40.197 & $-$44 39 46.66 & 8010.1525 & S 6506 \\
BF & 22 56 52.296 & $-$48 48 22.71 & 8450.1385 & S 6512 & * \\
BG & 23 07 52.230 & $-$49 45 48.49 & 8451.0619 & S 6524 \\
BH & 23 07 57.495 & $-$49 25 21.82 & 8451.0988 & S 6525 \\
BI & 22 21 10.437 & $-$44 03 52.64 & 8002.1544 & S 6484 \\
BL & 22 52 31.006 & $-$49 08 32.11 & 8450.0749 & S 6509 \\
BM & 23 03 57.117 & $-$48 50 22.35 & & S 6518 \\
BN & 23 04 51.267 & $-$45 11 22.69 & 8448.0001 & S 6519 \\
BO & 23 06 58.609 & $-$43 54 37.93 & 8012.0197 & S 6523 & * \\
\hline
\end{tabular}

\normalsize
\begin{tabular}{rlrl}
\multicolumn{4}{l}{Notes to Table 2:} \\
Y & AC 3979282 & UW & AC 4386194 \\
Z & AC 3968740 & AF & AC 3980440 \\
RR & AC 3969308 & AK & AC 3981413 \\
RT & AC 3971745 & AN & Included in L\'opez (1985) \\
RW & AC 3978711 & AR & AC 3465745 \\
RY & AC 3467189 & AT & AC 3970121 \\
RZ & AC 3979267 & BF & AC 3980481 \\
SV & AC 3972840 & BO & AC 3981631 \\
UV & AC 3975848 \\
\end{tabular}
\end{center}

\references
ESA, 1997, The HIPPARCOS and TYCHO Catalogues, ESA SP-1200.

Kholopov, P.N., Samus, N.N., Frolov, M.S. {\it et al.}, 1985, {\it
General Catalogue of Variable Stars}\ (4th ed.; Moscow: Nauka
Publishing House)

Lasker, B., Sturch, C., McLean, B.J. {\it et al.}, 1990, {\it
Astron.\ J.}, {\bf 99}, 2019

L\'opez, C.E., 1985, {\it IBVS}, No.\,2837

L\'opez, C.E., and Girard, T.M. 1990, {\it Publ.\ Astron.\ Soc.\ Pac.}, {\bf 102}, 1018

L\'opez, C.E., and L\'epez, H.S., 1993, {\it IBVS}, No.\,3908

Manek, J., 1999, private communication

Monet, D., Bird, A., Canzian, B., {\it et al.}, 1998, USNO A2.0;
U.S. Naval Observatory, Washington DC

R\"{o}ser, S., and Bastian, U., 1991, {\it PPM Star Catalogue}\
(Heidelberg: Astronomisches Rechen Institut)

Urban, S.E., Corbin, T.E., Wycoff, J.C. {\it et al.}, 1998, {\it
Astron.\ J.}, {\bf 115}, 1212

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