HV Vir outburst
Observed: 14, 15 Feb 2008
15 Feb 2008
Updated 16 Feb 2008, 17 Mar 2008
This UGWZ cataclysmic was reported as being in outburst.
Time-series of the beginning of the outburst, showing double peaks,
HV Vir is a cataclysmic variable, that is a binary system with an accreting
white dwarf. Its orbital period is 1.3918h=83.508mn (Warner (1995)). It
is classified as a UGWZ or of WZ Sge type, that is a dwarf nova with rare
(one per ~10 years) and very bright outbursts. In its quiet state, HV
Vir is around mag 19 and reaches 11.5 when in outburst.
It was reported over the Internet as being in outburst, so I observe
it. The observations were submmited to the CBA
and to the AAVSO (observer BZU).
The observations were carried out with a 203mm SC telescope, a Clear
filter and a SBIG ST7E camera (KAF401E CCD). 177+132 usable images were
obtained, each with an exposure duration of 60s (except the first one:
For the photometry the comparison star is GSC300-00056 (AAVSO 125 or
000-BBT-577) with an assumed unfiltered magnitude of 12.000, and the check
star is GSC300-00603 (AAVSO 141 or 000-BBT-570) with a measured average
magnitude of 13.621, an average 1-sigma statistical uncertainty of 0.032
and a standard deviation of 0.039.
The resulting light curves:
The error bars are +/- the 1-sigma statistical uncertainties. Good
Foggy sky conditions, the beginning of the session was lost.
I was able to observe only the beginning of the outburst. Other observers
were able to observe superhumps, especially at the Higashi-Hiroshima Observatory,
with the KANATA telescope, see
Warner B. (1995) Cataclysmic variable stars Cambridge UP.
Telescope and camera configuration.
Computer and software configuration.