R.A. 20h07m36.4, Dec +17o42'15.4" (J2000.0).
VSNET-Alert 6095[2001 July 23 - vsnet-campaign-nova 413] if star near 9.7 mag it may still be rising. Previous outbursts had max near 7 mag [http://saturn.sron.nl/~erikk/wzsge_1913_1946_1978.ps] Close monitoring for the following few months would be nice to find the bright humps at the orbital period in the beginning of the outburst, the superhumps later on, and the rebrightening or not - 1978 outburst showed nice rebrightenings, whereas the 1946 outburst did not. Also fast photometry is needed to see whether there are ~30 sec (quasi-periodic) oscillations, which normally only appear in quiescence. Erik Kuulkers.
VSNET-Alert
6125 -Time-resolved spectroscopic observations
by K. Sadakane, Osaka-Kyoiku University; 2001 July 24 OAO 36-inch at 400-500nm.
Spectrum near mid eclipse shows He II 4686 A in strong emission + doubled
profile; peak separation ~14A - peaks vary with orbital period. CIII
- NIII complex at 4640 A also in emission/ double peak. H-beta shows emission
+ absorption feature like P Cyg profile - varies with orbital period.
Higher Balmer series H-gamma/ delta are broad absorption features, as is
He I 4471 A. The emission feature resembles start of 1978 outburst
[IAUC 3311; Ortolani et al. 1980] four days after maximum but does not
resemble the spectra taken by K. Ayani at Bisei during the rising stage
[vsnet-alert 6110], which shows no emission component around the wavelength
of HeII and C-N complex. Hajime BABA and Kozo Sadakane- VSNET Collab.
Team
Nova Cygnus'01
Nova Scorpius'01
Nova Aquila'01
Nova 1917 = CI Aql
my main spectroscopy
page
WZ Sge webpages VSNET
Gianluca Masi
Donn Starkey The
Astronomer variable stars
2001 Aug 1&11: 60s CCD exposures taken
10 days apart show, via differential photometry, a 0.31 mag fade of WZ
Sge. Aug 11 image - a green filter plus IR block simulates V mag.
The filtration has little effect as comparison field star
[SAO 105719; A2-spectrum; m8.5] has a similar spectral profile to WZ Sge
recorded via the same SX MX9 CCD camera..
2001
July 26/27: First images and lo-res spectra
[~50A/pixel and 25A/pixel] of this nova-like object currently 'bright'
~mag 9 and within binocular range. WZ Sge is 19o lower
in the sky than the current Nova Cyg'01 but at the same RA!
WPO spectra could be snapped in 20s exposure
[50A/pixel] to reveal the principle feature of broad [unresolved] emission
'band' of helium [HeII+CIII etc - see above VSNet Alert 6125] and apparent
changes [may be artefacts of seeing] over a few minutes. WZ Sge
quoted as having an orbital period of ~82 minutes. Field star [SAO
105719; A2-spectrum; m8.5] used for comparison in adjacent 60s spectrum
exposure. Wide field image 180s exposure. More WPO images
and higher res 25A/pixel spectra soon.
text & images copyright - Maurice Gavin - Worcester Park Observatory - UK - 2001