[vsnet-alert 2937] NGC 2841 sequence revision

[bas@lowell.Lowell.Edu (Brian Skiff)]

     Bob Modic, attentive as usual, has noticed that I have identified in error
the mag. 12.6 star observed by Tsvetkov near NGC 2841.  Using his information,
I have made the correct ID, confirmed by offsets for another star in Tsvetkov's
list that is farther afield.  The complete revised sequence list is given again
below.  Below the main table is a list of explicit R magnitudes for each star
that might be suitable for ordinary unfiltered CCD systems.  The last line
shows magnitudes for the "new" Tsvetkov star in the GSC and USNO-A2.0
catalogues.
     I got a note today from Harold Corwin, who observed the BVRI sequence with
Marian Frueh.  (If I previously gave the impression that the stars were
observed by me, that was not my intention---the material is merely
unpublished.)  Harold noted that he thought the stars in this field were
adequately measured except perhaps the faintest stars in the U (not given here)
and I filters.

\Brian


Name                  RA  (2000)  Dec    s     GSC       V    B-V   V-R   V-I
NGC 2841 1          9 22 28.4  +51 00 51 G  3431-0219   8.48  1.29  0.67  1.23
NGC 2841 2          9 21 50.8  +51 00 36 G  3431-0625  11.07  0.59  0.33  0.65
NGC 2841 3Ts        9 22 53.3  +51 01 28 G  3431-1249  12.62  0.64 (0.37)
NGC 2841 3          9 21 47.3  +50 58 50 G  3431-0053  13.51  0.75  0.43  0.83
NGC 2841 4          9 21 58.2  +51 00 16 G  3431-0495  13.77  0.60  0.40  0.74
NGC 2841 5          9 22 02.3  +51 01 23 G  3431-0159  14.19  0.83  0.42  0.91
NGC 2841 147        9 22 06.8  +50 53 37 G  3431-0802  14.72  0.88 (0.49)

Note:  V-R colors in parens were derived from B-V.


Name    R
1      7.81
2     10.74
3Ts   12.25
3     13.08
4     13.37
5     13.77
147   14.23


In photographic catalogues, 3Ts:  m(GSC)=12.58, USNO-A2.0  mb=13.3, mr=12.3

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