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Alert Notice 209: Outburst of 2325+43 DX Andromedae AND Outburst of 2318+17 EP Pegasi AND New variable in Crux - 1250-60 Var Cru AND Reminders to monitor 0409-71 VW Hydri and 2138+43 SS Cygni [NSV 19555]

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THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
INTERNET: aavso@aavso.org

Tel. 617-354-0484 FAX 617-354-0665

AAVSO ALERT NOTICE 209 (June 21,1995)

OUTBURST OF 2325+43 DX ANDROMEDAE

We have been informed by AAVSO member Jack Nordby, Moorhead, MN, and by Tonny
Vanmunster, Landen, Belgium (Belgian Astronomical Society, WS, Cataclysmic Variables
Circular (CVC) No. 42
), that the dwarf nova type cataclysmic variable DX And is
undergoing an outburst, as indicated by the following observations:

May 20.979 UT, < 13.0, T. Vanmunster, Landen, Belgium; 21.938, < 13.8, Vanmunster;
22.983, < 13.0, Vanmunster; 27.933, < 13.0, Vanmunster; 29.053, 14.9, G. Poyner,
Birmingham, England; 30.038, < 13.8, Vanmunster; Jun 1.930, < 13.0, Vanmunster; 2.972,
< 13.8, Vanmunster; 6.001, < 13.0, Vanmunster; 7.943, < 13.8, Vanmunster; 8.990, < 13.8,
Vanmunster (via CVC); 9.010, < 13.0, P. Schmeer, Bischmisheim, Germany (via CVC);
10.010, < 13.4, Schmeer;18.351,12.1, J. Nordby, Moorhead, MN; 18.993,12.2, Vanmunster;
19.001, 12.3, G. Poyner, Birmingham, England (via CVC); 19.009, 12.3, E. Broens, Mol,
Belgium (via CVC); 19.939, 12.6, Vanmunster; 19.996, 12.3, Schmeer; 20.007, 12.3, J. Pietz,
Erftstadts, Germany; 20.284, 12.3, Nordby; 20.461, 12.5, R. Royer, Lakewood, CA; 21.26,
12.9, G. Dyck, Assonet, MA.

The most recent outbursts of this cataclysmic variable occurred in September 1994 (see
AAVSO Alert Notice 193), when DX And reached magnitude 11.6 at maximum, and in
August 1993, when it reached magnitude 11.0. The outbursts generally last two to three
weeks.

Please monitor the current outburst of DX And closely, using the "e" scale AAVSO
preliminary chart distributed with AAVSO Alert Notice 193, and report your observations
to AAVSO Headquarters.

OUTBURST OF 2318+17 EP PEGASI

We have been informed by Tonny Vanmunster, Landen, Belgium, that the dwarf nova IP
Peg has gone into outburst. The most recently-observed outbursts of IP Peg occurred in
December 1994, when the star reached magnitude 12.0 (AAVSO Alert Notice 192), and in
August 1994, when it reached magnitude 11.8.

Recent observations include:

May 10.074 UT, < 12.6, T. Vanmunster, Landen, Belgium; 21.043, < 12.9, Vanmunster;
28.024, < 13.8, Vanmunster; 30.056, < 13.8, Vanmunster; Jun 3.019, < 12.9, Vanmunster;
7.979, < 12.9, Vanmunster; 8.994, < 12.9, Vanmunster; 19.014, 13.0, Vanmunster; 20.007,
13.9, Vanmunster; 20.029, 13.8, J. Pietz, Erftstadts, Germany; 20.455, 13.8, R. Royer,
Lakewood, CA.

Please monitor IP Peg closely, using the "e" scale AAVSO preliminary chart distributed
with AAVSO Alert Notice 192, and report your observations to AAVSO Headquarters. IP
Peg is a cataclysmic variable that has deep eclipses of two magnitudes or more with a
period of 3.8 hours and a duration of several tens of minutes. Monitoring the eclipses
during the outburst is valuable and recommended; report the timing of all positive
observations to the minute (four decimal places).

NEW VARIABLE IN CRUX: 1250-60 VAR CRU

We have been informed by D. Green, Central Bureau for Astronomical Telegrams
(CBAT), of the discovery of a new variable star in Crux by astronomers (no names
available) at the Observatorio Astronomico del Colegio Cristo Rey, Rosario, Argentina.
The astronomers reported CCD observations of March 21 UT, 11.29; May 30, 9.53; and
June 2, 9.44.

Green reports a precise position provided by A. Gilmore and P. Kilmartin, Mount John
University Observatory, New Zealand, for epoch 2000:

  R. A. = 12h 56m 25.64s Dec. = -60deg 57' 56.6"

G. Williams, CBAT, examined the Digital Sky Survey, but found no corresponding image
to magnitude 16-17 (assumed V), implying that the object is of relatively large amplitude.
Kilmartin found an image on the Vehrenberg Atlas Stellarum, but did not find an image on
the Papadopoulos True Visual Magnitude Photographic Star Atlas. (Green)

Observations made by Kilmartin and Gilmore (via Green), and W. Liller, Vina del Mar,
Chile, indicate that the object is very red, and is most likely a long period variable.

Additional observations of Var Cru include:

1992  Jun 1.02 11.2 PTG orange filter, W. Liller
Jun 9.20 11.3 PTG orange filter, Liller
1994  Jan 30.28 11.0 PTG red filter, Liller
Jul 30.04 <11.5 PTG orange filter, Liller
Sep 2.04 <11.5 PTG orange filter, Liller
1995  Mar 22.40 <11:5 PTG orange filter, Liller
May 21.01 11.5: PTG orange filter, Liller
May 29.02 11.2 PTG orange filter, Liller
Jun 3.12 11.3 PTG orange filter, Liller
Jun 5.98 11.8 CCDV, Liller
Jun 5.98 10.7 CCDR with IR block, Liller
Jun 7.39 11.94 V, P. Kilmartin

Please use the accompanying AAVSO 'b" and "d" scale preliminary charts prepared by C.
Scovil, to observe Var Cru, and report your observations to AAVSO Headquarters.

Congratulations to the astronomers at the Observatorio Astronomico del Colegio Cristo
Rey on their discovery!

OUTBURST OF 0846 + 58 BZ URSAE MAJORIS

The dwarf nova-type cataclysmic variable BZ UMa has undergone a short outburst, as
indicated by the following observations:

Jun 1.915 UT, < 13.7, T. Vanmunster, Landen, Belgium; 2.935, < 13.7, Vanmunster; 7.911,
< 13.7, Vanmunster; 7.957, < 13.7, G. Poyner, Birmingham, England; 8.986, < 13.7,

Vanmunster; 9.89, < 13.3, P. Schmeer, Bischmisheim, Germany; 9.941, < 13.7, Poyner;
10.906, < 12.6, Schmeer; 11.90, < 12.6, Schmeer; 14.950, 11.5, Poyner; 15.956, 12.7:, B.
Worraker, Didcot, England (via G. Poyner); 16.924, < 11.7, Schmeer; 18.991, < 13.7,
Vanmunster; 19.929, < 13.7, Vanmunster; 19.938, < 13.2, Schmeer.

The last recorded outburst of BZ UMa was in October 1994, when it reached magnitude
11.2.

REMINDERS TO MONITOR 0409-71 VW HYDRI AND 2138+43 SS CYGNI

0409-71 VW Hydri. As was requested of our southern hemisphere observers in AAVSO
Alert Notice 208
, please monitor VW Hyi closely between June 23 and July 14, and notify
us IMMEDIATELY when it becomes brighter than magnitude 12.5. Timely notification is
crucial in order to schedule EUVE observations as part of a coordinated observing run
with the EUVE, Voyager, and ALEXIS satellites by astronomers at Lawrence Livermore
National Laboratory.

2138+43 SS Cygni. As was also requested in AAVSO Alert Notice 208, please keep a close
eye on SS Cyg between now and the end of January 1996, and inform us when you see it
going into or in outburst, i.e., when it is brighter than 11.3, so we may inform astronomers
at the IUE station in Vilspa, Spain, who are interested in observing SS Cyg with the IUE
when it is undergoing an anomalous outburst, i.e., when it is slow in rising to maximum
brightness.

Chart links are obsolete; 11/2013 create charts using VSP at http://www.aavso.org/vsp

The answering machine at AAVSO Headquarters is on nights and weekends for your
convenience. Please call our charge-free number (800-642-3883) to report your
observations. We also encourage observers to send observations by fax to 617-354-0665 or
by e-mail through the Internet to observations@aavso.org.

When telephoning in observations, please state the name of the star, the magnitude, and
the time of the observation. Please speak clearly. The preferred time is either your local
time (be sure to state the time zone and whether it is Standard or Daylight Savings Time)
or Universal Time. You do not need to give the designation of the star. Please also
include the comparison stars you have used in making the observation.

Many thanks for your efforts and your valuable observations.

Good observing!

Janet A. Mattei
Director

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