Delta Scorpii 2011 - Day 3, June 30

Today the sky is clear of the "calima", but the wind is quite strong, with gusts.
By 18:00 hours we started with darks and flats.
The wind was blowing at speeds above 35 km per hour.
This is a limitation for the IAC80.
The operation is unrestricted with wind speeds up to 35 km/hour, but is limited with wind speeds above this value. The operation is allowed only in azimuths 40 degrees or more away from the wind direction.
This limitation did not permit the capture of spectra on Delta Scorpii.
So we captured spectra of the secondary targets, 66 Ophiuchi and Pi Aquarii.
By 02:00, the wind speed dropped to approximately 30 km/hour and, very rapidly, we selected Delta Scorpii and got 40 minutes of captures in the Helium II.
Then, almost simultaneously, the wind speed increased above the 35 km/hour and the time limit for Delta Scorpii was reached.
Here is, just as an example, a spectrum of Delta Scorpii in the Halpha.

The night ended by 06:00, as usual.
After a short sleep and a lunch at El Portillo, we came back to the IAC80, where we met the Director of Teide Observatory, Miguel Serra and Johan Knapen.

They made us welcome.
All the staff here is extremely cooperative and any request regarding the equipment, or changes like the installation of the Filly lamp or the correction of the screen for the flats are quickly done to our satisfaction.
This afternoon the wind speed is clearly lower than yesterday and we hope to have a perfect night.

Alberto