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Thanks Koen,<br>
but why didn't we spot this on the flats taken earlier??? <br>
Edwin<br>
<br>
<br>
On 6-8-2011 9:40, Konrad Kuijken wrote:
<blockquote
cite="mid:656DF725-3D6D-4B3C-BC17-98935CED964D@strw.leidenuniv.nl"
type="cite">Here are some pictures of the results of Bernards
tests covering one of the aux filters in dome flats. Clearly some
light does leak through in this way. With the dome lamps the peak
contamination of the flat fields are are
<div><br>
</div>
<div>u ~ 30%</div>
<div>v ~ 5% (Stroemgren)</div>
<div>z ~ 1.2%</div>
<div>r ~ 0.2%</div>
<div><br>
</div>
<div>They affect at least the two ccds near the aux ccds.</div>
<div><br>
</div>
<div>r106, r107, r107-106: r filter from night 217 (ie
FLAT217_0106 etc)</div>
<div>u01,u02, u02-01: u filter from night 214</div>
<div>v29,v30,v30-29: v stroemgren from night 216</div>
<div>z27,z28,z28-27: z from night 216</div>
<div><br>
</div>
<div>Notice also how in a few cases dust specs on the filters came
and went: they cause a <0.05% effect.</div>
<div>Certainly for u this is going to make data reduction even
more complex. </div>
<div>Koen</div>
<div><br>
</div>
<div><img apple-width="yes" apple-height="yes"
id="4407a34d-07d8-4868-9ad5-e2d8b9d548ea"
src="cid:part1.03010603.01030509@astro.rug.nl" height="690"
width="540"><img apple-width="yes" apple-height="yes"
id="0c98a078-45b9-4a7e-a8c3-97474a99dfb1"
src="cid:part2.03040203.05060309@astro.rug.nl" height="690"
width="540"><img apple-width="yes" apple-height="yes"
id="1d2d9695-6365-47e5-b6b2-3b6ebf28b6df"
src="cid:part3.01090908.01050806@astro.rug.nl" height="690"
width="540"><img apple-width="yes" apple-height="yes"
id="5b393fec-b983-44d9-8295-508667a22903"
src="cid:part4.06020003.07030800@astro.rug.nl" height="690"
width="540"><img apple-width="yes" apple-height="yes"
id="0f03951a-ea73-4230-a2fc-8dd8a0dcfbb9"
src="cid:part5.04010702.05020608@astro.rug.nl" height="690"
width="540"><img apple-width="yes" apple-height="yes"
id="033f0ac7-c588-4abd-aca4-25627730f122"
src="cid:part6.09050301.04090702@astro.rug.nl" height="690"
width="540"><img apple-width="yes" apple-height="yes"
id="410ac3e3-e2cd-490b-b84f-ccbaa4afea59"
src="cid:part7.06060402.09020406@astro.rug.nl" height="690"
width="540"><img apple-width="yes" apple-height="yes"
id="f28863ad-9fc4-4a08-9e9a-e27ab2885d3d"
src="cid:part8.05000203.01090704@astro.rug.nl" height="690"
width="540"><img apple-width="yes" apple-height="yes"
id="a4c1c8de-aa11-41c7-b62e-489e51451ecf"
src="cid:part9.04060103.09040708@astro.rug.nl" height="690"
width="540"><img apple-width="yes" apple-height="yes"
id="9ba4fdc1-1377-4fae-a358-09a66afea6df"
src="cid:part10.00020700.04000107@astro.rug.nl" height="690"
width="540"><img apple-width="yes" apple-height="yes"
id="fe699b59-49f3-42b5-a116-db50c8cee3ea"
src="cid:part11.05090003.01020909@astro.rug.nl" height="690"
width="540"><img apple-width="yes" apple-height="yes"
id="b1b697c2-c344-42cc-bec5-bd948aa54d07"
src="cid:part12.08020203.01080206@astro.rug.nl" height="690"
width="540"></div>
<br>
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