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[vsnet-campaign-news 159] V877 Ara: new SU UMa-type dwarf nova shines!
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V877 Ara: newly established SU UMa-type dwarf nova in superoutburst
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On June 7, Rod Stubbings (Australia) reports that V877 Ara is
undergoing a bright outburst! This object is a candidate SU UMa-type dwarf
nova (the last likely superoutburst occurred in 2001 August).
YYYYMMDD(UT) mag observer
20020529.369 <142 (Rod Stubbings)
20020529.740 <143 (Berto Monard)
20020601.406 <146 (Rod Stubbings)
20020602.392 <144 (Rod Stubbings)
20020603.419 <144 (Rod Stubbings)
20020604.521 <144 (Rod Stubbings)
20020607.424 138 (Rod Stubbings)
20020607.450 139 (Rod Stubbings)
[Berto Monard's identification information]
I have identified NSV 08383 at its outburst position with star
USNO-A2.0 0225-27288943 at location 17 16 52.75 -65 32 47.1 This star
has a quiescent magnitude around 17.3 and B-R=0.7 which indicates the
blue colour of this object when compared to neighbouring stars of that
brightness level at quiescence.
[Superhump detection -- new SU UMa-type dwarf nova!]
Roland Santallo (Southern Stars Observatory, Tahiti French Polynesia)
just reported time-series photometry of V877 Ara (NSV08383) taken on June 9.
The data show fully developed superhumps (amplitude 0.25-0.30 mag),
establishing that V877 Ara is a new member of SU UMa-type dwarf novae.
Although exact period determination is still difficult on single-night
data, the system has a relatively long (around 0.08 d) superhump period.
Observers are strongly urged to continue observation as long as possible
(prefreably more than two superhump cycles per night) in order to precisely
determine the superhump period.
Congratulations to Roland Santallo on this breath-taking success!
Regards,
Taichi Kato
VSNET Collaboration team
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VSNET (Variable Star Network) is an international variable star observing
network, covering various areas of novae, supernovae, cataclysmic variables
(CVs), X-ray transients, and other classical eruptive, pulsating, and
eclipsing variables. VSNET is one of invited contributing organizations
to the SkyPub AstroAlert system.
VSNET Home Page: http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/
CCD observations of such targets are a relatively easy task for a 20-40cm
telescope; simply take as many CCD frames (with exposure times 10-30 sec)
as possible, spanning several hours per night. The only requirements are
the weather and your patience! If you need more help on the observing
technique, please feel free to ask on the vsnet-campaign list.
We would sincerely appreciate volunteers who would join the VSNET
Collaboration team to study the wonders of these exotic variable stars.
To join the VSNET campaign collaborative list, send an e-mail to
vsnet-adm@kusastro.kyoto-u.ac.jp (VSNET administrator)
with a line "SUBSCRIBE vsnet-campaign." or your comment to join the
collaboration team.
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