RA Range: 14h - 23h

Constraint set (Typical seeing, Transparency,Airmass, FLI, Moon distance): 0.8, 2CLR, 1.5, 0.7, 45

Pre-imaging run?	No!	Chilean run?	No!	Special calibrations?	No!
Time critical?	No!	ToO?	No!	Carry-over run?	No!

 
 
  High-resolution spectroscopy of flat-spectrum quasars, used as 
background light sources for study of very narrow (often unresolved) 
interstellar absorption lines in the Milky Way. Sources are quite 
faint (V=18 to 18.5) and all are potentially variable (if caught 
during a flare they might be 2 or 3 magnitudes brighter than usual). 

  The depolarizer has been selected because most of the targets are BL 
Lac-type objects, thus likely to be (or known to be) highly polarized. 
Long exposure times are needed. Two finding charts provided for very 
faint object B1730-130. BLUE Guide camera selected; if problems arise, 
please switch to RED on the fly. 

  No scheduling constraint needs to be followed for observations of 
the two relatively bright, hot stars for use as high-S/N reference 
spectra for telluric lines and fringing. 

==> OBs have been prepared for FLI=0.7. Should this be violated, please 
classify OB as B (not as C) because P.I. and program can afford slightly 
higher FLI values.
 

 

Run status page 67.C-0157A

README of this run:

67.C-0157A.README