[Aavso-photometry] IK Tau & RT Ari Chart "Issues"

[Tim Crawford]

For me, the AAVSO charts for IK Tau (very urgently in
need of observations) and RT Ari (in need of
observations) do not seem to show an adequate number
of field stars when doing photometry, especially when
both of the VS are dim and the integrations longer.

>From my own integrations I was unable to identify with
confidence the VS with the fields shown on the
respective charts because of the higher number of
field stars captured with the CCD.

My solution, finally,  was to go to Aladin Sky Atlas
and retrieve one of the POSS images, which show many
more field stars.  I have now added the  POSS images
for these charts to my chart book to supplement the
AAVSO charts.

http://aladin.u-strasbg.fr/aladin.gml

Their are other retrieval options besides Aladin and I
would suggest that anyone trying to image either of
the these fields to supplement your AAVSO charts with
additional support.


CS

Tim Crawford
Arch Cape Observatory
Oregon