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Alert Notice 215: Dwarf nova 0043+56b GX Cas in outburst AND 1544+28a R Coronae Borealis continues to fade AND Brightening of 1848-19 FN Sagittarii AND Reminders on 0409-71 VW Hydri, 0749+22 U Geminorum, and 2138+43 SS Cygni

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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 215 (October 16, 1995)

DWARF NOVA 0043+56B GX CASSIOPEIAE IN OUTBURST

The dwarf nova type cataclysmic variable GX Cas is in outburst as reported by John Bortle
(Stormville, NY). David York (Abiquiu, NM) independently confirmed the outburst.
Below are observations reported to AAVSO Headquarters:

Aug 31.10 UT, < 15.3, J. Bortle, Stormville, NY; 31.10, < 14.0, G. Dyck, Assonet, MA;
31.2035, < 14.0, R Stewart, Fairlawn, NJ; 31.2583,16.4:, J. Nordby, Moorhead, MN; 31.899,
< 15.2, T. Vanmunster, Landen, Netherlands; 31.965, < 15.2, D. York, Abiquiu, NM; Oct
9.9743, 13.3, Bort1e;10.0979,13.4, York; 11.0708, 13.4, York; 11.9938, 13.3, Bortle; 12.0889,
13.4, York; 12.2243, 13.8, C. Scovil, Stamford, CT; 13.0111, 13.3, Bortle; 13.116, 13.7,
Stewart;13.1549,13.6, Scovi1;14.1174,13.6, York; 14.3097,13.8, J. Griese, Stamford, CT.

The observations in the AAVSO International Database indicate that the last two
outbursts of this star were in November 1993 and Aug 1994, when GX Cas reached 12.5
and 13.4, respectively, at maximum. The outbursts lasted about 15 days.

Please use the accompanying d and e scale AAVSO Preliminary charts to observe GX Cas
and report your observations to Headquarters, indicating the comparison stars used.

1544+28A R CORONAE BOREALIS CONTINUES TO FADE

The observations below reported to AAVSO headquarters indicate that R CrB is fading
fast (see AAVSO Alert Notice 214). Please observe it closely and report your observations
to AAVSO Headquarters.

Oct 4.0715 UT, 6.4, W. Dillon, Missouri City, TX; 4.0813, 7.4, D. Weier, Madison, WI;
4.0833, 6.4, P. Collins, Scottsdale, AZ; 4.13, 6.7, L. Price, Oregon, WI; 4.768, 6.2, P. Skalak,
Karlovy Vary, Czech Republic; 4.774, 6.8, Skalak; 4.791, 6.9, J Sainz, Madrid, Spain; 4.792,
6.5, G. Poyner, Birmingham, England; 4.817, 6.9, J. Ripero, Madrid, Spain; 5.0688, 6.7,
Dillon; 5.0972, 6.4, Collins; 5.1, 6.7, D. Swann, Carrollton, TX; 5.7743, 6.5, J. Van der Looy,
Balen, Belgium; 5.778, 6.8, Skalak; 6.0708, 7.0, Dillon; 6.1042, 6.4, Collins; 6.3333, 6.5, R.
Fidrich, Budapest, Hungary; 6.768, 6.9, Skalak; 6.803, 6.8, P. Schmeer, Bischmisheim,
Germany; 6.82, 6.8, G. Comello, Groningen,Netherlands; 7.0625, 6.8, A. Dill, Wichita, KS;
7.069, 6.4:, F. West, Hanover, PA; 7.0708, 6.9, Dillon; 7.1236, 6.9, Dillon; 7.779, 6.9,
Schmeer; 7.8056, 6.6, K. Medway, Southampton, England; 7.819, 6.9, Ripero; 8.1438, 7.0, A.
Abbott, Leduc,Alberta, Canada; 8.7639, 6.9, Van der Looy; 8.78, 6.9, Comello; 8.812, 7.0,
Ripero; 8.813, 6.9, Poyner; 8.98, 7.0:, G. Dyck, Assonet, MA; 8.9826, 7.2, R. Martin,
Crofton, MD; 9.007, 7.0:, West; 9.0243, 6.8, R. Harvan, Leonardstown, MD; 9.0451, 7.2,
Dillon; 9.0528, 6.9, Dill; 9.0938, 6.6. Collins; 9.13, 7.2, C. Spratt, Victoria, British
Columbia, Canada; 9.7708, 7.0, Van der Looy; 9.787, 7.0, Poyner; 9.9514, 7.1, J. Bortle,
Stormville, NY; 9.9708, 7.3, P: Dombrowski, Glastonbury, CT; 9.995, 7.2, West; 10.0, 6.9, R.
Stewart, Fairlawn, NJ; 10.0236, 7.0, R. Hays, Worth, IL; 10.0507, 7.1, L. Hiett, Arlington,
VA; 10.0590, 7.2, Dillon; 10.0833, 6.8, Collins; 10.0882, 7.4, D. York, Abiquiu, NM; 10.75,
7.2, L. Kiss, Szeged, Hungary; 10.778, 7.1, Poyner; 10.9653, 7.0, S. Sharpe, Ellsworth, ME;
10.98, 7.7, Dyck; 10.992, 7.3, West; 11.0424, 7.1, Dill; 11.0625, 7.2:, T. Hager, New Milford,
CT; 11.0771, 7.4, York; 11.1, 7.7, E. Heironimus, Hazelwood, MO; 11.1042, 7.2, Collins;
11.1049, 7.5, Dillon; 11.75, 7.3, Kiss; 11.8, 7.5, A. Pereira, Carnaxide, Portugal; 11.81, 7.8,
M. Zanotta, Milan,Italy; 11.9653, 7.0, Sharpe; 11.98, 7.8, Dyck; 11.988, 7.5, West; 12.0028,
7.8, Bortle; 12.0583, 7.5, Hager; 12.0819, 7.8, Dillon; 12.0833, 7.6, York; 12.0972, 7.5,
Collins;12.1229, 7.8, York; 12.7, 7.9, Fidrich;12.74, 7.9, Zanotta;12.81, 7.7, Pereira;12.819,
8.2, Ripero; 12.9917, 8.0, Bortle; 12.992, 7.7, West; 13.0, 8.2:, Stewart; 13.0035, 8.0, C.
Stephan, Sebring, FL; 13.0528, 7.7, Dill; 13.1, 7.9, G. Rosenberg, Tucson, AZ; 13.75, 8.0,
Kiss; 14.0639, 8.1, Hager; 14.0868, 8.7, York; 14.09, 7.8, Rosenberg; 14.1264, 8.8, York;

14.7238, 8.2, O. Shemmer, Ra'anana, Israel; 14.75, 8.2, Kiss; 14.83, 8.4, R. Goncalves,
Oeiras, Portugal; 15.0319, 8.8, P. Goodwin, Shreveport, LA; 15.1000, 8.7, Dillon; 15.78, 9.1,
Zanotta; 15.819, 8.9, Itipero; 16.012, 8.7:, West; 16.0326, 8.8, Goodwin; 16.0938, 9.4:,
Dillon.

BRIGHTENING OF 1848-19 FN SAGITTARII

The symbiotic star FN Sgr is brightening, as reported by John Bortle (Stormville, NY) and
as indicated by the following observations:

Aug 14.1 UT, 13.0, J. Bortle, Stormville, NY; 17.296, 12.9, W. Albrecht, Pahala, HI; 19.1,
13.0, P. Robbins, Kansas City, KS; 20.1, 12.9, Bortle; 22.1, 13.0, R. Modic, Richmond
Heights, OH; 26.1, 13.1, Robbins; 29.1, 12.9, Bortle; 31.9, < 12.0, R. Jones, Fish Hoek,
South Africa; Sep 12.0729, 12.4, Bortle; 15.0847, 11.8, Bortle; Oct 9.9528, 11.5, Bortle;
12.0056,11.5, Bort1e;13.0174,11.5, Bortle.

The last brightening of FN Sgr occurred in May 1994, when it reached magnitude 11.8 at
maximum.

Please observe FN Sgr as closely as much as possible during this observing season, using
the revised d scale AAVSO Preliminary chart prepared by C. Scovil. Please note that the
13.3 comparison star to the north northeast of FN Sgr on the previous chart dated 8/94 has
been identified as a suspected variable (NSV 11479) in the New Catalogue of Suspected
Vaiable Stars.

REMINDERS ON 0409-71 VW HYDRI, 0749+22 U GEMINORUM,
AND 2138+43 SS CYGNI

0409-71 VW Hyi: The Hubble Space Telescope is scheduled to observe this dwarf nova on
21 October (see AAVSO Alert Notice 214). We remind observers in the Southern
Hemisphere to monitor this star closely through 22 October, and report observations to
AAVSO Headquarters daily. Please inform us immediately if VW Hyi goes into outburst.

0749+22 U Gem: The Hubble Space Telescope observed this dwarf nova during its
minimum on 10 October (see AAVSO Alert Notice 214) and is scheduled to observe it
again on 18 November. Please continue to observe U Gem closely and report your
observations to AAVSO Headquarters.

2138+43 SS Cyg: Please continue to report your observations of outbursts of SS Cyg to
Headquarters so that we can alert astronomers who are planning to observe it with the IUE
satellite if the outburst is anomalous, i.e., SS Cyg rises slowly to maximum.

CHARTS AND LIGHT CURVES AVAILABLE ON AAVSO FTP SITE

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

We have prepared electronic copies of AAVSO charts mentioned in this Alert Notice for
the followuig stars: GX Cas, FN Sgr. They are available from our FTP site:

  ftp.aavso.org (198.116.78.2), in /pub/alert215

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.

Many thanks for your efforts and valuable astronomical contributions.

Janet A. Mattei
Director

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