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Date: Sun, 12 Dec 93 20:47:14 MST
From: bas@lowell.edu (Brian Skiff account lowell)
Here is the first night on a magnitude sequence near Nova Cas 1993 for
the use of visual obsevers. The stars were measured using the Lowell 53cm
photometric telescope with Stromgren y and b filters in a 29-arcsec diaphragm.
Uncertainties should be well under 0.02 brighter than V ~11, and better than
0.03 below that. Positions come from the GSC.
Star RA (2000) Dec V b-y spec remarks
HD222618 23 41 54.4 +57 15 36 6.246 0.630 G8III = HR 8985
HD222514 23 41 00.7 +57 50 19 7.213 0.112 Am
HD222543 23 41 13.1 +57 33 18 8.277 0.186 A3
HD222671 23 42 31.2 +57 16 54 8.550 0.100 A0
HD240359 23 40 47.7 +57 19 19 9.349 0.165 A0
BD+56 3064 23 41 41.9 +57 36 16 10.357 0.313
GSC4008-1356 23 40 59.1 +57 29 08 10.919 0.558
GSC4008-0687 23 41 44.3 +57 35 47 12.499 1.523
N Cas 93 23 41 47.3 +57 31 03 6.461 0.557 1993 Dec 13.1 UT
Because of the emission-line nature of the nova's spectrum, the magnitude
and color for it cannot be considered to be on the standard system, but on
some instrumental system, despite being corrected for the nominal color term
of the instrumental system.
I will get a second night of obsevations on these stars and try to fill
in the gaps in the sequence as well. Note that the faintest star is quite
red, and will not only appear fainter visually than indicated here, but is
also likely to be somewhat variable (the color suggests a reddend M giant).
I will measure a replacement of more ordinary color.
\Brian Skiff
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