Date: Wed, 25 Aug 2004 16:33:40 -0600
From: Richard Huziak <huziak@sedsystems.ca>
Subject: [AAVSO-DIS] Eclipsing Variables that need some bodies
To: aavso-discussion@mira.aavso.org
Message-ID: <412D13C4.2030903@sedsystems.ca>
Content-Type: text/plain; charset=windows-1252; format=flowed

  I suppose I should post this on the AAVSO discussion list.  I just 
sent it to the RASC (Canada) discussion list to try to promote some 
more 
observing.  

At the Berkeley meeting, Marv Baldwin showed me a list of eclipsing 
binaries, mostly EA's that have been 'ignored' in recent years and 
need 
to be checked up on to see if their ephemerides are still accurate 
(and 
to add minimae to the database).  Anyone without a specific project 
might want to add these stars to their program.  Both visual and CCD 
light curves are welcome - ideal for those lazy, tired unattended 
CCD 
time-series nights when you can't think of anything else to do.  
Your 
data is best reported to the EB team - see the website for how, but 
if 
you are lazy like me, it can also usually be reported to the regular 
repository and head office periodically forward that data to Marv.  
Make 
sure you indicate in your data if you converted to HJD or not.

Of course, none of this is possible IF THE CLOUDS NEVER CLEAR! :-)

The message as sent to the RASC:

Stan, RASClist et al:

If anyone wants a variable star project, the following AAVSO 
eclipsing 
(Algol-type) stars do not have recent times of minima observed, so 
no 
one is really sure if these stars are eclipsing on time or not. A 
great 
many Algol-type stars change their periods through mass-exchange 
processes that change the center of mass of the system. It is 
important 
to do time-series runs on these stars to determine a new ephemeris 
for 
each. If doing CCD photometry, make sure your time is set to the 
nearest 
second. I doing visual observing, make sure your watch is set to the 
nearest minute. This is astrophysics in action, folks! Why not watch 
the 
sky change in real time?! Ephemerides for these stars can be found 
at:

www.aavso.org

under \Observing\Observing Programs\Eclipsing Binary Program 
Pages\Eclipsing Binary Commitee Section

or by going directly to:

http://www.aavso.org/observing/programs/eb/ebephem.shtml

Times of minimum will be given to the nearest 1/2 hour assuming the 
older predictions are OK. I would suggest that you begin observing 
as 
soon as it gets dark that evening and observe the star every 15 
minutes 
(visual) or as often as possible with time-series CCD. EB 
observations 
are sent to the AAVSO Eclipsing Binary section (run by Marv Baldwin) 
 
see the AAVSO website for reporting instructions. You may report in 
UT 
or JD and indicate whether or not you have converted the times to 
HJD. 
Charts for all these stars are available on-line at:

http://www.aavso.org/observing/charts/

Just type the name of each star in the "NAME" box, and stand back!

Worthy program. Gives you guys something to do! Stars are availble 
for 
all apertures & lighting conditions.


Name Range Period Last Observed Min.

AC Tau 10.3  13.1V 2.043356d 1988
RW Cap 9.8  11.0p 3.392446d 1996
TW And 8.8  10.9V 4.122774d 1997
AQ Peg 10.4  12.7V 5.5485028d 1999
AG Vir 8.5  9.1V 0.64265075d 2000
delta Lib 4.9  5.9V 2.3273543d 2000
RV Per 10.3  12.7V 1.9734926d 2000
SW Cyg 9.3  12.0V 4.57313411d 2000
XZ Aql 10.1  11.4p 2.139181d 2000
AL Cam 10.5  11.3p 1.32833335d 2001
BO Mon 10.0  12.1V 2.2252193d 2001
EW Lyr 11.2  13.5V 1.948723d 2001
SS Cet 9.4  13.0V 2.973976d 2001
Y Cam 10.6  12.0V 3.3056244d 2001
Y Leo 10.1  13.2V 1.6861020d 2001
ZZ Boo 6.8  7.4V 4.9917440d 2001
AM Tau 10.4  12.3V 2.043926d 2002
CT Her 10.6  11.7p 1.7863748d 2002
FL Lyr 9.3  9.9V 2.1781544d 2002
RV Tri 11.5  13.3p 0.75366648d 2002
RW Tau 8.0  11.6V 2.7688356d 2002
RY Aqr 8.8  10.1V 1.966594d 2002
SX Oph 11.8  12.3p 2.0633038d 2002
FZ Del 10.2 11.3p 0.7832126d 2002
TT Del10.6  12.5p 2.871119d 2002
TY Del 9.7  10.9V 1.19112689d 2002
UZ Dra 9.9  10.7p 3.2613024d 2002
V343 Aql 10.6  12.3p 1.844603d 2002
V346 Cyg 11.8  13.5p 2.743282d 2002
W Del 9.7  12.3V 4.806100d 2002
WW Cyg 10.0  13.3V 3.3177690d 2002

-- 

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Richard Huziak (HUZ)
Manufacturing Engineering
SED Systems, Saskatoon
tel. (306) 933-1676

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