wpo - Nova Sgr 2001 #3 = V4740 Sgr
We have been informed by the Central Bureau for Astronomical Telegrams (IAU Circular 7706) that Alfredo Pereira, Portugal, and William Liller,Chile, have independently discovered an apparent nova in Sagittarius. Pereira's visual discovery was made on Sep. 5.846 UT at magnitude 7.0 with strong orange color, during his regular patrol with 14x100 binoculars. Liller's photographic discovery was made on two films taken Sep. 3.979 UT, using Kodak Technical Pan film and an orange filter, that showed the nova at magnitude 10.0. His confirming CCD image of Sep. 6.039 UT (taken through clouds) showed the nova at CCDV (broadband) magnitude 7.27.
VSNET ALERT 6593: V4740 Sgr spectrum [Mon,
10 Sep 2001 09:49:42 +0900 (JST)]
M. Fujii (Fujii Bisei Observatory) reports
a spectrum of
V4740 Sgr taken on Sep. 9.49 UT. Both H-alpha and H-beta are
broad emission
(FWHM =2000 km/s, Gaussian fit). The
emission lines of Fe II series are prominent, indicating that the object
is a Fe-II class nova.
Nova
Scorpius'01 Nova
Aquila'01 Nova
1917 = CI Aql my
main spectroscopy page
VSNET
Nova webpage Nova
Sgr 2001#3 starchart Doug
West's nova spectrogram
2001 Sept 16: Observation continue after
a 6 day break of poorish weather with the telescope pointing virtually
horizontally at the southern horizon. The nova [mag 7.5v VSNET] has settles
down to classic profile with emission lines of Ha [dominating]
and Hb [emerging] in the 10 days since discovery
- shown here with comparison to Nova Cyg#2 2001discovered 2001 Aug 18 [mag
10.8v on Sept 1].
2001 Sept 10: Ha emission,
emerging just 24 hours ago, now dominates the spectrum in classic novae
fashion. Hb is clearly emerging too.
2001 Sept 9: Spectra obtained Doug
West and co-discoverer Bill Liller within 48 hours of discovery show
Ha was absent or very weak - the Ha
line appearing over the next 24 hours and within a further 24 hours beginning
to dominate. Spectra obtained through increasing longitude [by Fujii 140E,
Gavin 0W, Liller 70W and West 110W] provide good coverage. My series
below show the changes over Sept 8 and 9.
2001
Sept 8: WPO image of starfield and lo-res spectrum [50A/pixel]
of this nova very low on the southern meridian through haze.
Extremely broad emission lines at ~546nm [equal in strength to Ha], 614nm and 656nm [=Ha] and bright continuum of this nova at outburst.
Cut-off of blue spectrum probably due to atmospheric absorption. Spectra curved by atmospheric refraction; stars vertical ovals. More spectra to follow as weather /sky conditions permit.
Co-discoverer Bill Liller's nova spectrum [below] dated 2001 Sept 7
and 9 via OG prism [blue to left] - with permission.
text & images copyright - Maurice Gavin - WPO - 2001