Subject: request

From: Donald G. York

Submitted: Wed, 31 Aug 2005 12:06:08 -0500

Message number: 925 (previous: 924, next: 926 up: Index)

I have a bit of a strange request. To answer a referee on a DIS 
paper, I need a few minutes of time with DIS to observe a star, 
HD157787, A2V, through clouds (!!). I got all the scattered light 
test data I needed except this one exposure set, on Aug. 30(UT), but 
it was clear all night, so did not get subject information. (Guess 
the "strangeness" of the request is now clear. The results of this 
fairly exhaustive set of exposures will be of use to others, as I 
plan to right it up. Jon Holtzmann, Rich Kron, Lew Hobbs, and Jack 
Dembicky have all been instrumental in helping me do this set of 
scattered light tests, and I thank them.

Several options that would help.
1) First half, with instrument set up the same as I need. (DIS blue 
hi 4300, red hi 6600, 1.5 arcsec slit). I can be on guard on a night 
that looks like clouds are likely, come in on one hours notice, do 
the test in 10 minutes and be gone.

2) First half, DIS on, I change gratings, do my cals, do test, reset 
gratings, recalibrate for you (or you can do it yourself). That would 
all take one hour.

3) If a willing soul exists but only for second half time, I can find 
another star, and all of the above apply.

Specific nights I can do this are Sept. 1, 7-15, Sept. 24-30.

Suzanne and Bruce, maybe I could sneak this in on engineering time if 
the setup is not disturbing to other plans?
-- 
Dr. Donald G. York
Horace B. Horton Professor of Astronomy and Astrophysics

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