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[vsnet-obs 6977] Nova V1974 Cyg campaign - update
- Date: Sun, 24 Aug 1997 12:39:20 +0300
- To: vsnet-obs@kusastro.kyoto-u.ac.jp
- From: Alon Retter <alon@wise.tau.ac.il>
- Subject: [vsnet-obs 6977] Nova V1974 Cyg campaign - update
- Cc: c1@kusastro.kyoto-u.ac.jp, c1@sagano.kusastro.kyoto-u.ac.jp, c1@sanma.kusastro.kyoto-u.ac.jp, rudolfn@physics.muni.cz, mbigno@box1.tin.it, jmanek@mbox.vol.cz, cbaceo@clark.net, captain@braeside.org, cba-info@tristram.phys.columbia.edu, tkato@kusastro.kyoto-u.ac.jp, katsura@kusastro.kyoto-u.ac.jp
- Sender: owner-vsnet-obs@kusastro.kyoto-u.ac.jp
Nova Cyg 1992 campaign
----------------------
Hello to all Nova Cygni friends!
During 19-21/8/97 the telescope and observers at Wise Obs. kept
bothering Nova Cygni, however high humidity inforced us to stop
observations early, and we got only about 5,4,2 hr. on each night
respectively. The 2 nearby stars (around 2 srcsec. difference) are
clearly seen on most of the images, and I think that a carefull psf
reduction will be successfull in getting both magnitudes, and for
deciding who is the real nova. To our purpose (follow the evolution of
the 2 periods in time) it's not that important, since apparture
photometry (catching both stars) is fine. Anyway, it will take me a
while to do the recution, especially because I think that there is a
small problem with my automatic program, when dealing with such close
stars.
Data from other telesopes are slowly being compiled. Preliminary results
show that the superhump still exists, with a peak-to-peak amplitude of
about 15 percent (counting both stars). It seems that P dot of the
superhump has reversed it sign - the period is decreasing now, but more
data are needed for confirmation. The orbital period has also a strong
(but wide) peak in the power spectrum. We certainly need more nights in
order to check whether it decreases in time.
We welcome Jan Manek from Stefanik Observatory, Czech Republic, who
recently joined the campaign. We thank all participats for their
contribution to the campaign. Keep the good work! We still call for
more observers from other Observatories to join us. The campaign
continues up to December.
I enclose below a beautiful light curve (~8 hr in 13/8/97) obtained by
Bob Fried from the CBA at the Braeside Observatory, Flagstaff. 4
superhumps are clearly visible. Bob, from unkown reason, I lost
contact with you, could you email me, please.
Alon Retter
Wise Obs.
-------------------------------------------------------------------
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