Delta Sco brightens mag V = 0.8

[Francois Teyssier]

The ATel :
http://www.astronomerstelegram.org/?read=8618

[umberto sollecchia]

Bonjour à tous, je confirme l'explosion.

Profilo Delta Sco.png (5.2 KiB) Viewed 9231 times

Cordialement Umberto

[Joan Guarro Flo]

Molto Buono, Umberto:

Tu été le premier.

Amicalement, Joan.

[umberto sollecchia]

Merci Joan, je vis maintenant les spectres à basse résolution sur Bess qui ne sont pas différents de ce que mon.
Je ne pense pas que ce outburst, je présente mes excuses pour l'erreur de jugement.
Cordialement Umberto

[Francois Teyssier]

Good shot Umberto, but unfortunatly a false alert (despite an ATel !)
All the best,
François

[Joan Guarro Flo]

The star Del Sco, in the last night.

J.Guarro.

[James Foster]

Here is a spectra of del SCO taken last night with a CDK17 telescope, JTW L200 spectroscope, and ST-10xme CCD:

The calibrated with neon lamp and instrument corrected spectrum shows a nice fit of HA & Hb emission lines and a the He I line as
well as Hy and Hdelta absorption lines. The heliocentric velocity is +6.73 km/s and del SCO's space velocity is -6 km/s according
to the Simbad database. The object was quite low (>2 air mass) when shooting the 9x30 second exposure(s) at 1x1 binning, so my
telluric O2 lines are very prominent.

James Foster
Los Angeles, Ca

[Benjamin Mauclaire]

Hello James,

It looks like your continuum is a bit eventful, mostly in blue part.
Is it real shapes from star?
Here are some low resolution spectra taken from arasbeam.free.fr :









SNR problem?
IR correction problem?
Ripples?

Benji

[Robin Leadbeater]

Hi James,

I agree with Benji, there does seem to be some unexpected ripples in the blue half of the spectrum. Did you make a flat correction? (This is particularly important with some Kodak CCD based cameras which can have strong ripples in the wavelength response which show up in low resolution spectra)

Robin

[James Foster]

No flat was used. The air mass was low (>1.9) and that part of the sky has pretty bad LP.
When shooting, especially after using neon lamp, I do 10-18 flush (dark frames) to purge
Any remaining after glow on the chip. I didn't see "ripples" on any other object's spectra
That night.

James

p.s. I'll post one or two more del SCO spectra taken when higher in the sky.