THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
Tel. 617-354-0484 Fax 617-354-0665
http://www.aavso.org
* * * AAVSO NEWS FLASH * * *
Subject: 2138+43 SS CYG 1911-00 FO AQL No. 642
0854-24 VZ PYX 1953+77 AB DRA July 10, 2000
1552+72 SS UMI
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2138+43 SS CYGNI CAMPAIGN AND NOTE OF THANKS:
SINCEREST THANKS to all our observers who have been observing SS Cygni very
closely and sending their observations to us regularly. Thanks to your
efforts and observations we have been alerted to the brightening of SS Cyg
immediately, and once it was certain that SS Cyg was definitely in outburst,
last night proposals were submitted for the Target of Opportunity (ToO)
observations with the three satellites - Chandra x-ray satellite, RXTE, and
EUVE.
(9-1-00 UPDATE - A second target of opportunity window has been approved
for September! Please observe through the next outburst and report activity
as soon as possible.)
(9-13 UPDATE - The campaign was successful and both Chandra and EUVE
are observing the satellite. Please continue making careful observations
until the end of the outburst.)
This morning we were informed that unfortunately due to problems with the
High Energy grating of Chandra, the ToO observations with that satellite can
not be scheduled at this time. Since Chandra is the primary satellite for
the ToO observations of SS Cyg, the other satellite (RXTE and EUVE)
observations have been cancelled at this time also. There is a possibility
that Chandra observations, along with RXTE and EUVE ones may be scheduled in
early part of next week, if SS Cyg is still at maximum at that time. Thus,
at this time we send a plea to all of you our observers again, please keep a
close eye on SS Cyg during its current outburst, and continue to send in
your observations nightly to determine the duration of this outburst.
Good news -- a few months ago, astronomers at the University of Florida, Jet
Propulsion Laboratory and Planetary Science Institute requested us to
inform them of the start of the July outburst of SS Cygni so that the
"First-Ever infrared Interferometric observations of a cataclysmic
variable [SS Cygni]" can be carried out with the Palomar Testbed
Interferometer to directly measure the size of a cataclysmic variable. This
is truly a pioneering research in CVs! Last night we informed our colleagues
of the start of SS Cyg outburst so that this "first-ever" interferometric
observations can be scheduled. They are on the target at this time!
Again, on behalf of our colleagues, and personally many, many thanks to you
our observers for your dedication and observations! My personal thanks also
to our technical staff, Kerri Malatesta, Gamze Menali, Rebecca Pellock,
and Elizabeth Waagen, who have been working very hard in compiling all the
nightly observations on SS Cyg, and in my absence, regularly informing our
colleagues of its behavior! Since mid-June I had been teaching about
variable stars and AAVSO's Hands-On Astrophyicss to an excellent group of
teachers and students at TOPS 2000 workshop
(http://www.ifa.hawaii.edu/tops/). We now have a new, very enthusiastic
group of variable star observers from Texas, Hawaii, and the Pacific
Islands, joining us! --- JAM-----
Below are observations of SS Cyg submitted to the AAVSO showing its most
recent, anticipated outburst:
AAVSO Observer AAVSO Observer
UT Mag. Initials UT Mag. Initials
JUL 03.923 11.8 TUB JUL 09.1674 11.1 SXN
JUL 06.2229 12.0 DIL JUL 09.1694 11.3 MDP
JUL 06.854 11.9 TUB JUL 09.1823 11.4 PAH
JUL 07.338 11.9 MRV JUL 09.2070 11.12 CCDV ZRE
JUL 07.97 11.6 GUN JUL 09.2222 10.9 LNZ
JUL 07.986 11.7 MUY JUL 09.2278 11.2 RR
JUL 08.003 12.0 OJR JUL 09.2542 11.2 BTH
JUL 08.1065 11.4 CGF JUL 09.3500 10.9 LMK
JUL 08.1215 11.8 BRJ JUL 09.4354 10.9 HSG
JUL 08.1653 11.7 MKJ JUL 09.5389 10.5 LMK
JUL 08.1730 11.80 CCDV ZRE JUL 09.5937 10.2 LMK
JUL 08.1771 12.0 KB JUL 09.843 9.2 TUB
JUL 08.2229 11.9 RR JUL 09.8528 9.6 BSR
JUL 08.2930 11.65 CCDV ZRE JUL 09.8535 9.6 FSE
JUL 08.3438 11.5 PCH JUL 09.8549 9.5 FSE
JUL 08.3510 11.54 CCDV ZRE JUL 09.8590 9.3 BSR
JUL 08.3764 11.9 CKN JUL 09.8611 9.4 FSE
JUL 08.3868 11.2 LMK JUL 09.8660 9.5 FSE
JUL 08.8785 11.4 FSE JUL 09.8701 9.4 FSE
JUL 08.8806 11.4 FSE JUL 09.8771 9.2 FSE
JUL 08.8938 11.2 FSE JUL 09.8781 9.43 CCDV FGI
JUL 08.9021 11.1 FSE JUL 09.8847 9.1 FSE
JUL 08.9049 11.1 FSE JUL 09.8919 9.41 CCDV FGI
JUL 08.9076 11.1 FSE JUL 09.8965 8.9 FSE
JUL 08.9181 11.1 FSE JUL 09.9076 8.8 FSE
JUL 08.92 11.1 VET JUL 09.9095 9.40 CCDV FGI
JUL 08.9215 11.0 FSE JUL 09.910 9.3 RMQ
JUL 08.9368 11.0 FSE JUL 09.9105 9.37 CCDV FGI
JUL 08.938 11.2 RMQ JUL 09.9194 8.7 FSE
JUL 08.9424 11.1 FSE JUL 09.9285 8.6 FSE
JUL 08.9472 11.2 FSE JUL 09.938 8.9 RMQ
JUL 08.9486 11.1 FSE JUL 09.9410 8.7 FSE
JUL 08.9542 11.0 FSE JUL 09.9444 8.6 FSE
JUL 08.9583 11.1 FSE JUL 09.9507 8.6 FSE
JUL 08.9604 11.1 FSE JUL 09.9556 8.7 FSE
JUL 08.9639 11.2 FSE JUL 09.9646 8.7 FSE
JUL 09.017 11.6 OJR JUL 09.9736 8.6 FSE
JUL 09.0781 11.2 PAH JUL 10.0778 8.8 SET
JUL 09.0816 11.7 PAH JUL 10.1743 8.5 KB
JUL 09.0944 11.3 MDP JUL 10.2049 8.8 DIL
JUL 09.0951 11.2 KMA JUL 10.2139 8.5 BTH
JUL 09.1153 11.4 MDP JUL 10.2333 8.9 RR
JUL 09.1243 11.7 BRJ JUL 10.2500 8.4 SXN
JUL 09.1458 11.2 MDP JUL 10.3653 8.3 SXN
JUL 09.1580 11.13 CCDV ZRE JUL 10.4577 8.9: DEH
JUL 09.1604 11.3 MDP
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0854-24 VZ PYXIDIS
The dwarf nova type (SU UMA subclass) cataclysmic variable VZ PYX may be in
outburst, as indicated by the following observations:
AAVSO Observer AAVSO Observer
UT Mag. Initials UT Mag. Initials
JUN 19.4514 14.0 PEX JUL 08.3486 12.8 WPX
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1552+72 SS URSAE MINORIS
The dwarf nova type (SU UMA subclass) cataclysmic variable SS UMI is in
outburst, as indicated by the following observations:
AAVSO Observer AAVSO Observer
UT Mag. Initials UT Mag. Initials
JUL 07.2132 <15.8 HSG JUL 08.922 <14.2 OJR
JUL 07.911 <14.2 OJR JUL 09.1264 14.6 BRJ
JUL 07.952 <14.2 MUY JUL 09.4229 14.4 HSG
JUL 08.12 <14.7 BRJ JUL 09.933 14.8 RMQ
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1911-00 FO AQUILAE
The dwarf nova type (SS CYG subclass) cataclysmic variable FO AQL is in
outburst, as indicated by the following observations:
AAVSO Observer AAVSO Observer
UT Mag. Initials UT Mag. Initials
JUL 06.282 16.4 CCDV OCN JUL 08.476 14.7 SRX
JUL 07.2021 <13.9 SXN JUL 08.683 14.0 SRX
JUL 07.2326 <14.5 HSG JUL 08.92 14.2 VET
JUL 07.978 <13.9 MUY JUL 09.001 <14.5 OJR
JUL 08.017 <14.5 OJR JUL 09.1188 14.4 BRJ
JUL 08.12 <14.5 BRJ JUL 09.4174 13.9 HSG
JUL 08.1778 <13.9 MKJ JUL 09.922 14.1 RMQ
JUL 08.476 14.7 SRX JUL 10.2701 13.9 SXN
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1953+77 AB DRACONIS
The dwarf nova type (Z CAM subclass) cataclysmic variable AB DRA is in
outburst, as indicated by the following observations:
AAVSO Observer AAVSO Observer
UT Mag. Initials UT Mag. Initials
JUL 06.1 <14.0 CGF JUL 08.1243 12.6 BRJ
JUL 06.1833 14.2 HSG JUL 08.93 12.2 PUJ
JUL 07.1590 13.7 CGF JUL 08.945 12.6 RMQ
JUL 07.1861 13.5 HSG JUL 08.965 12.7 OJR
JUL 07.2118 13.4 HSG JUL 09.1278 12.5 BRJ
JUL 07.2354 13.5 HSG JUL 09.33 12.4 LMK
JUL 07.9292 13.0 JCN JUL 09.340 12.5 LMK
JUL 07.955 12.9 MUY JUL 09.4208 12.7 HSG
JUL 08.033 12.7 OJR JUL 09.908 12.7 RMQ
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We thank the following contributors for the data that they
have provided for this News Flash:
BRJ - J. BORTLE, USA MRV - R. MODIC, USA
BSR - S. BARONI, ITALY MUY - E. MUYLLAERT, BELGIUM
BTH - T. BURROWS, USA OCN - S. O'CONNOR, CANADA
CGF - G. CHAPLE JR., USA OJR - J. OSORIO, SPAIN
CKN - K. CASTLE, USA PAH - C. PRICE, USA
DEH - E. DONAGHY, USA PCH - C. PULLEN, USA
DIL - W. DILLON, USA PEX - A. PEARCE, AUSTRALIA
FGI - G. FAVERO, ITALY PUJ - F. PUJOL, SPAIN
FSE - S. FOGLIA, ITALY RMQ - M. RESZELSKI, POLAND
GUN - J. GUNTHER, FRANCE RR - R. ROYER, USA
HSG - G. HANSON II, USA SET - C. STEPHAN, USA
JCN - C. JONES, ENGLAND SRX - R. STUBBINGS, AUSTRALIA
KB - W. KAMINSKI, USA SXN - M. SIMONSEN, USA
KMA - M. KOMOROUS, CANADA TUB - V. TUBOLY, HUNGARY
LMK - M. LINNOLT, USA VET - M. VERDENET, FRANCE
LNZ - G. LENZ, USA WPX - P. WILLIAMS, NEW ZEALAND
MDP - P. MCDONALD, CANADA ZRE - R. ZISSELL, USA
MKJ - J. MCKENNA, USA
Please monitor these and other variable stars closely and phone-in, fax,
or e-mail your observations to the AAVSO.
Good observing!
Janet A. Mattei, Director
Kerri Malatesta, Technical Assistant
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Symbols may include: < = fainter than magnitude given (variable not seen)
: = uncertain
CCDV = Charge-coupled device with (V) filter
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http://www.aavso.org/newsflash/
We look forward to including your observations in future editions
of AAVSO NEWS FLASH!
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