AAVSO NEWS FLASH No. 17
THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
Tel. 617-354-0484 Fax 617-354-0665
INTERNET: aavso@aavso.org
* * * AAVSO NEWS FLASH * * *
Subject: AK Cnc, AT Cnc, SY Cnc, R CrB No. 17
SS Cyg, AM Her, VW Hyi, ER UMa
May 6, 1996
________________________________________________________________________________
AK CANCRI
The dwarf nova type cataclysmic variable AK Cnc is in outburst as indicated
by the following observations:
AAVSO Observer
UT JD Mag. Initials
MAY 2.2021 2450205.7021 <13.6 BTH
MAY 4.2014 2450207.7014 13.6 BTH
MAY 5.1917 2450208.6917 13.4 BTH
MAY 6.2042 2450209.7042 13.6 BTH
-----------------------------------------------------------------------------
AT CANCRI
The dwarf nova type cataclysmic variable AT Cnc is in outburst as
indicated by the following observations:
AAVSO Observer
UT JD Mag. Initials
MAY 1.1979 2450204.6979 <14.0 BTH
MAY 2.2382 2450205.7382 13.8: BTH
MAY 4.1931 2450207.6931 13.2 BTH
MAY 5.1868 2450208.6868 12.8 BTH
MAY 6.1986 2450209.6986 13.2 BTH
-----------------------------------------------------------------------------
SY CANCRI
The dwarf nova type cataclysmic variable SY Cnc is in outburst as
indicated by the following observations:
AAVSO Observer
UT JD Mag. Initials
APR 25.0729 2450198.5729 13.6 BRJ
APR 28.0806 2450201.5806 13.1 BRJ
APR 29.1986 2450202.6986 12.4: BTH
APR 30.1986 2450203.6986 12.6: BTH
MAY 1.2125 2450204.7125 12.2 HSG
MAY 1.2146 2450204.7146 12.1 BTH
MAY 2.0889 2450205.5889 12.5 MKJ
MAY 2.2458 2450205.7458 12.0 BTH
MAY 4.2028 2450207.7028 11.4 BTH
MAY 5.1931 2450208.6931 11.5 BTH
MAY 6.1667 2450209.6667 11.2 HSG
MAY 6.2056 2450209.7056 11.5 BTH
-----------------------------------------------------------------------------
R CORONAE BOREALIS
R CrB continues to brighten (see AAVSO News Flash No.16) as indicated
by the following observations:
AAVSO Observer
UT JD Mag. Initials
APR 30.9326 2450204.4326 11.0 BMM
MAY 1.1528 2450204.6528 10.9 DIL
MAY 1.2472 2450204.7472 11.3 HSG
MAY 2.0521 2450205.5521 10.7 RRB
MAY 2.3229 2450205.8229 11.0 GMB
MAY 2.9 2450206.4 10.5 KIL
MAY 4.867 2450208.367 10.4 DPA
MAY 4.973 2450208.473 10.4 PYG
MAY 5.873 2450209.373 10.4 DPA
MAY 5.9 2450209.4 10.8 VET
MAY 5.974 2450209.474 10.5 PYG
MAY 6.1431 2450209.6431 11.0 HSG
MAY 6.2264 2450209.7264 10.3 RR
-----------------------------------------------------------------------------
SS CYGNI
SS Cyg is fading slowly from its recent maximum (see AAVSO News Flash
No. 16) as indicated by the following observations:
AAVSO Observer
UT JD Mag. Initials
APR 30.939 2450204.439 8.6 JLT
MAY 2.2889 2450205.7889 8.6 KMA
MAY 2.3535 2450205.8535 8.4 GMB
MAY 2.4771 2450205.9771 8.4 COL
MAY 2.96 2450206.46 8.3 GUN
MAY 3.0 2450206.5 8.5 KIL
MAY 3.2931 2450206.7931 8.6 KMA
MAY 3.4743 2450206.9743 8.4 COL
MAY 5.051 2450208.551 8.7 PYG
MAY 6.050 2450209.55 8.8 PYG
-----------------------------------------------------------------------------
AM HERCULIS
The magnetic cataclysmic variable AM Her is fluctuating in brightness
as indicated by the following observations:
AAVSO Observer
UT JD Mag. Initials
APR 27.059 2450200.559 13.6 SKP
APR 28.1007 2450201.6007 14.0 BRJ
APR 28.3139 2450201.8139 13.7 HAV
APR 28.3264 2450201.8264 13.7 HSG
APR 29.071 2450202.571 14.0 JLT
MAY 2.3014 2450205.8014 13.7 KMA
MAY 3.3139 2450206.8139 13.7 KMA
MAY 4.983 2450208.483 13.9 PYG
MAY 5.9 2450209.4 14.4 VET
MAY 5.985 2450209.485 13.9 PYG
MAY 6.2069 2450209.7069 13.8 HSG
This star oscillates between magnitude 12.5 and 14.1 in its "up" state.
The above observations fall within the fainter end of this range. Please
keep an eye on AM Her to see if the "up" state will continue.
-----------------------------------------------------------------------------
VW HYDRI
The dwarf nova (SU UMa subclass) type cataclysmic variable VW Hyi is
having a superoutburst (See AAVSO News Flash No. 15 and 16) as indicated by
observations from Jan Hers, Danie Overbeek and Jan Smit (South Africa) and
William Liller (Chile). Excellent sets of CCD(V) data on superhumps have
been obtained by W. Liller on several nights.
The XTE satellite has been observing VW Hyi since May 2nd and EUVE is
scheduled to observe it starting May 7. Both satellites will be observing
it until May 15. Observers in the Southern Hemisphere are strongly
encouraged to keep a close eye on this star and phone in/Fax/e-mail your
observations to AAVSO so that we can inform the Principal Investigator at
Lawrence Livermore National Laboratory, California of its behavior.
-----------------------------------------------------------------------------
ER URSAE MAJORIS
The dwarf nova (SU UMa subclass) type cataclysmic variable ER UMa is in
outburst as indicated by the following observations:
AAVSO Observer
UT JD Mag. Initials
MAY 4.2250 2450207.725 <14.0 BTH
MAY 4.952 2450208.452 14.6 PYG
MAY 5.2118 2450208.7118 <14.0 BTH
MAY 5.955 2450209.455 13.3 PYG
MAY 6.2188 2450209.7188 13.3 BTH
-----------------------------------------------------------------------------
We thank the following contributors for the data that they have provided
for this News Flash:
BMM - M. Biesmans, Belgium KIL - L. Kiss, Hungary
BRJ - J. Bortle, USA KMA - M. A. Kamorous, Canada
BTH - T. Burrows, USA LIW - W. Liller, Chile
COL - P. Collins, USA MKJ - J. McKenna, USA
DIL - W. Dillon, USA OB - D. Overbeek, South Africa
DPA - A. Diepvens, Belgium PYG - G. Poyner, England
GMB - M. Gable, USA RR - R. Royer, USA
GUN - J. Gunther, France RRB - R. Raphael, USA
HAV - R. Harvan, USA SJX - J. Smit, South Africa
HJN - J. Hers, South Africa SKP - P. Skalak, Czech Republic
HSG - G. Hanson, USA VET - M. Verdenet, France
JLT - L. T. Jensen, Denmark
Please monitor these stars closely and phone-in, fax, or e-mail your
observations to the AAVSO.
Good observing!
Janet A. Mattei
________________________________________________________________________________
Symbols may include: < = fainter than magnitude given (variable not seen)
: = uncertain
CCDV = Charge-coupled device with (V) filter
If you would like to contribute to AAVSO NEWS FLASH, please send
observations of unusual variable star activity to:
observations@aavso.org
Those who wish to subscribe (free of charge) or unsubscribe to NEWS FLASH
may do so by sending a message to:
observations@aavso.org
If you would like data from the AAVSO International Database for
research purposes, please send your request to:
Janet Mattei, AAVSO Director, at aavso@aavso.org
We look forward to including your observations in future editions
of AAVSO NEWS FLASH!
________________________________________________________________________________
Return to HomePage
vsnet-adm@kusastro.kyoto-u.ac.jp