Super evening: wind at 0Km/h, 50% humidity. Things looked promising for another night of measurements. Right after dusk, we took four 20-minute spectra of WR 140. We then closed the dome to make a few flatfield calibration frames, for the grating position used on the spectrograph. We had not done these calibration frames during the day, because we went shopping, as you can read on the previous post!
Humidity sneaked by while the dome was still closed, and we could not open it again for to measure more targets! Later, the humidity was replaced by strong wind, and cold temperatures came! Now, it's -4.7ยบ outside ?!? Brrr..
What to do? Measure stuff about the camera's RBI (read the post about Residual Bulk Image), the sensor's undesireable elephant memory!
I will soon show what tests we made on the RBI problem.
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