VSNET-Alert 6075[2001 July 18] Optical spectra [range 430 - 680 nm] of possible nova in Cygnus taken July 17.9 UT via Boller & Chivens spectrograph on 122 cm telescope show broad emission lines of H I, Fe II, and probably Na I D and N II. Some prominents emission lines have P Cygni type absorption. The FWHM of H-alpha emission ~950 km/s and a weak absorption blue-shifted ~1200 km/s. This object could be a classical nova in the early decline stage from light maximum. T. Iijima - Asiago Astrophysical Observatory of Padova - Italy.
Nova
Scorpius'01 Nova
Aquila'01Nova
1917 = CI Aql
my
main spectroscopy page
VSNET
Nova Cyg01 webpage The
Astronomer
variable star webpage
2001 Sept 16: Nova had faded to mag 16.2v
on Sept 8.9 [G.Poyner-VSNET ] but recorded here, with a precise separation
from the dominant Ha emission line from the
real [zero order] image, in a crowded starfield.
2001
July 23: Permanent nova - P Cyg with both Ha
and helium [He] emission lines - is used for comparison to V2274 Cyg, a
few degrees away. More images soon.
2001 July 19/20: Clear slot in cloudcover
this evening for good spectrum [49A/pixel and 24.4A/pixel] using Vega for
calibration. The Ha emission line easily
recorded in 5 seconds exposure and is elongated from mutual red and blue
Doppler shifts through Nova's explosive expansion - enlarged image adjacent
- 60s exp. Preliminary wide-angle shot via 135mm f/2.8 lens plus HX5 CCD.
Calibrated
positive wide-angle image.
2001 July 18: Single WPO spectrogram taken this morning [four hour wait for one small hole in cloudcover with drizzle on scope!] is inconclusive with unusual IR excess unlike classic novae. My spectrogram and Megastar finder chart below. In response to an email to Dr Hitoshi Yamaoka, Kyushu Univ, Japan [2001 July 18] his reply "This possible nova is observed as very red (V=11.69, I=9.55 on Jul.16.53 UT), probably because of the intersteller or circumstellar extinction."
text & images copyright - Maurice Gavin - WPO - 2001