(fwd) SN1994D comparison stars (Skiff)

>From bas@lowell.edu Thu Mar 10 12:00:16 1994
Date: Wed, 09 Mar 1994 19:57:09 -0700 (MST)
From: bas@lowell.edu (Brian Skiff account lowell)
To: nova@nova.la.asu.edu
Message-ID: <Mar26@hoge.baba.hajime.jp>
Content-Transfer-Encoding: 7BIT
Status: R

Photometric sequences around N4526
     This is a reminder to visible-light observers that the preferred set
of local reference stars is that of Kilkenny & Malcolm 1984 MNRAS 209, 169.
They provide UBVRI data for several stars in the field measured from South
Africa using Cousins E-region standards.  They find a significant difference
between their results and UBV values by Hanes et al. 1976 (MNRAS 177, 653).
The differences are such that the Hanes V magnitudes are too faint by about
0.04, while B-V and U-B exhibit a lot of scatter.
     Visual observers using the Thompson & Bryan chart for the field are
reminded that the sequence is that of Hanes et al.  The Kilkenny & Malcolm
V magnitudes are as follows:

T&B     V (K&M)

 68     6.737
113    11.277
120    11.98
126    12.54   (immediately N of galaxy)
126    12.574  (SE of galaxy)
134    13.31
146    14.61

Thus only the star near the galaxy needs adjustment.  In addition, the bright
unmarked star WSW of the galaxy is HD 109285, for which the SIMBAD database
lists V = 6.91 and B-V = 1.04; the HD spectral type is K0, and the colors
imply that it is an ordinary K-giant.

\Brian Skiff