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[vsnet-campaign 585] RZ Leo: call for immediate follow-up observations!
RZ Leo: call for immediate follow-up observations!
[for vsnet-campaign readers, this is a copy of the message to the
CCD-astrometry-photometry mailing list].
The following news has been posted to vsnet-alert. The best challenging
and fascinating rare event for CCD photometrists!!
A guide. Use 10-30 sec integration times, use unfiltered CCD (unless
you have a large telescope), and continue grabbing as many frames as
possible (until dawn). Take appropriate dark and flat field frames
for accurate photometry. Ensure several nearby stars (of 11-13 mag)
are always within the same field. Avoid saturation of both target
and comparison stars. Do not use ABG. Simple aperture photometry is
enough for extracting variation.
============================================================================
RZ Leo: call for immediate follow-up observations!
As reported by Rod Stubbings in [vsnet-alert 5437], the possible WZ Sge
type dwarf nova RZ Leo is undergoing an extremely rare outburst!
Despite a number of unconfirmed possible sighting reports, the last
time when the outburst of this star was observed dates back to 1987!
And the present magnitude (12.1v) is probably the brightest one except
for the original discovery at mpg=11.5. All circumstances and the known
quiescent behavior strongly suggest that the present outburst is
a long-awaited superoutburst of this dwarf nova. Superhumps have not
been yet detected. We would encourage all observers to closely follow
the present outburst, using CCD or other photometry device, time-resolved
spectroscopy to detect the irradiated secondary, and multiwavelength
observations. The object is naturally chosen as the top-priority
target for the VSNET Collaboration team!
For the time being, until the initial results settle, we may either
use vsnet-alert and vsnet-campaign. Following the records of known
WZ Sge stars, we expect "early superhumps" (high to low amplitudes
modulations with a period close to the orbital period) at this very earliest
stage of such a superoutburst, which rapidly decays within a few days,
and usual superhumps grow. Please observe as long as possible, with
all your available instrument. The Kyoto team will of course observe
as long as we can.
Hoping your great successful observations and clear skies!
Regards,
Taichi Kato
VSNET Collaboration team
vsnet-adm@kusastro.kyoto-u.ac.jp
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vsnet-adm@kusastro.kyoto-u.ac.jp
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