[vsnet-chat 3085] Re: (fwd) Extragalactic Variables [chat] (Greaves)

[aah@nofs.navy.mil]

Kato suggested Draco C-1.  Note that this symbiotic is
included in the first Henden et al. symbiotic sequence paper
(A&AS 143, 343, 2000), so there is a nice UBVRI sequence
available.  The field photometry on
http://ftp.nofs.navy.mil/pub/outgoing/aah/munari/dracoc1.dat
is interesting, as you can see part of the Draco galaxy
if you plot (B-V) vs V (that is, a color-magnitude or
H-R diagram).
  My biggest concern is coordinates and identification
of extragalactic variables.  Even if the catalog lists
accurate coordinates, the field is often so crowded that
positive identification is difficult.  This is especially
true with HST variables or those found through difference
imaging techniques in galaxies such as M31.  I don't know
the answer.  For the upcoming NGC6853/M27 paper (not
extragalactic, but crowded), we are publishing small
(30arcsec) finder charts to identify the variables,
which could be included in an on-line catalog.
Arne

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