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[vsnet-chart 235] Stars near galaxies - 3
- Date: Fri, 10 Dec 1999 19:38:06 -0700 (MST)
- To: aavso-discussion@physics.mcmaster.ca, vsnet-chart@kusastro.kyoto-u.ac.jp, vsnet-chat@kusastro.kyoto-u.ac.jp
- From: Brian Skiff <bas@lowell.edu>
- Subject: [vsnet-chart 235] Stars near galaxies - 3
- Sender: owner-vsnet-chart@kusastro.kyoto-u.ac.jp
Another paper with stars measured near galaxies is by Poulain & Neito,
which contains UBVRI results for about 200 southern early-type galaxies. The
list below shows coordinates and BVRI data for about 80 stars they measured.
In no case here are the stars isolated from the galaxies, but instead are
mostly quite difficult objects near their centers. As a result, many of the
data are clearly erroneous. This is easy to spot from the consistency of the
star colors. Roughly speaking for stars of ordinary color the V-R color _must_
be about 0.6(B-V), and V-I _must_ be about 1.1(B-V). As an example, the first
star in the list has B-V = 0.80, V-R = -0.06, and V-I = 0.96. If we accept
that B-V is correct, then V-R is in error by half a magnitude(!), and V-I is
marginally acceptable within very generous uncertainties. The B-V and V-I
colors are much more likely to be correct, since very blue stars as implied by
the V-R color are extremely rare outside the galactic plane. Such discrepant
results almost certainly result from the problematic subtraction of the
galaxian background light, and demonstrate the difficulty of doing this with
a single-channel photometer on a 1m-class telescope, as was the case here.
Some of the data are okay (mostly the brighter stars, naturally), but
each case must be considered carefully. Again, observations with a modest
telescope and CCD could improve these results markedly.
The addition of the BVRI colors forced me to expand the format past
80 columns, but otherwise the arrangement is similar to previous lists.
\Brian
position sources (column 's'):
A USNO-A2.0
C AC2000
G GSC-ACT
S DSS image
T Tycho
============================
source: 1994A&AS..103..573P
POULAIN P. and NIETO J.-L.
Astron. Astrophys., Suppl. Ser., 103, 573-595 (1994)
UBVRI photoelectric photometry of bright southern early-type galaxies.
Host Galaxy RA (2000) Dec s GSC V B-V V-R V-I Location
NGC 1200 3 03 53.8 -12 00 03 A 15.15 0.80 -0.06 0.96 sup SW side
NGC 1336 3 26 31.2 -35 42 52 S 15.85 0.67 0.63 1.04 W of nuc, no good?
NGC 1395 3 38 26.9 -23 01 42 S 14.25 1.28 0.59 1.00 sup W side
MCG -5-13-14 5 34 39.9 -29 13 26 G 6488-1023 14.97 0.82 0.18 0.86 NW edge
NGC 2089 5 47 51.7 -17 35 47 A 16.02 0.72 0.39 0.62 sup N of center
NGC 2178 6 02 42.9 -63 45 37 A 15.29 0.53 0.36 0.48 NW edge
NGC 2187 1 6 03 49.9 -69 34 58 G 9168-0654 15.76 0.67 0.66 0.86 SW edge (NE comp)
NGC 2187 2 6 03 53.8 -69 34 16 S 16.14 0.83 0.05 1.17 NE edge (NE comp)
MCG -5-15-09 6 21 27.1 -28 06 35 S 14.82 0.74 0.37 0.99 NE of core
NGC 2230 6 21 26.5 -64 59 51 A 8902-0020 16.11 0.76 0.26 0.94 closer of two SSW
NGC 2305 6 48 41.6 -64 16 27 C 11.57 1.13 0.59 1.15 br * on E
NGC 2328 7 02 35.5 -42 04 18 S 16.25 0.63 0.36 0.97 SSW edge
MCG -5-18-01 7 15 29.0 -29 21 37 A 15.41 1.53 0.81 1.48 W edge, dbl
MCG -4-20-02 1 8 12 52.1 -27 33 21 A 6563-2292 13.96 0.54 0.31 0.63 SE edge
MCG -4-20-02 2 8 12 48.3 -27 32 54 A 6563-1542 14.05 0.42 0.23 0.41 NW edge, close dbl
NGC 2695 8 54 28.7 -03 04 02 G 4869-0923 14.54 0.41 0.40 1.06 brtr dbl* on E edge
NGC 2945 9 37 40.6 -22 02 14 S 16.16 0.53 0.28 0.85 SW of nuc
NGC 3090 10 00 30.0 -02 58 00 S 15.18 1.27 0.40 1.02 NW of nuc
NGC 3090 10 00 30.8 -02 57 35 T 4906-0326 10.5 1.4 NW edge,Tyc data,PPM 705082
MCG -6-23-16 10 14 00.2 -35 08 19 A 15.04 1.19 0.53 1.29 NW edge (SW of -17)
NGC 3606 11 16 13.3 -33 49 37 A 7210-0855 15.67 0.54 0.25 0.95 closer of two W edge
MCG -7-26-34 12 43 30.1 -41 21 52 S 14.35 0.77 0.46 1.03 SW flank
MCG -4-30-25 12 50 28.5 -26 50 12 S 15.95 0.83 0.53 1.15 due N of center
MCG -7-27-12 12 53 25.3 -41 11 55 S 13.47 0.76 0.44 0.90 NNE of nuc
NGC 4782 1 12 54 34.5 -12 33 43 A 5541-0995 13.99 1.14 0.59 1.28 NW edge (SW of N4783)
NGC 4782 2 12 54 36.9 -12 33 59 S 15.13 1.02 0.30 0.75 NE edge (SE of N4783)
NGC 4830 12 57 26.3 -19 42 03 A 14.77 1.54 0.53 0.89 SW edge
NGC 4936 1 13 04 17.6 -30 31 40 A 14.34 1.18 0.60 1.33 SE of core
NGC 4936 2 13 04 16.0 -30 31 02 S 15.79 0.69 0.22 0.85 NW edge
NGC 5153 13 27 51.5 -29 36 50 G 6725-1435 13.82 1.15 0.58 1.10 NE edge, N of N5152
ESO 221-20 13 58 22.7 -48 28 52 S 12.39 1.24 0.63 1.20 S edge
ESO 221-34a 14 16 06.0 -48 08 06 A 15.86 1.62 0.58 1.03 31" SE, close dbl
ESO 221-34a 14 16 07.1 -48 07 45 A 16.50 3.31 0.38 0.81 E end; B-V bogus
IC 4451 14 34 36.8 -36 16 39 G 7308-2266 10.90 1.20 0.64 1.20 br* N edge, CD-35 9625
ESO 137-45 1 16 51 01.7 -60 48 45 S 13.14 0.73 0.33 0.77 SSW edge
ESO 137-45 2 16 51 05.8 -60 48 28 S 14.64 0.79 0.35 0.81 gx? E edge
ESO 138-05 2 16 53 55.5 -58 46 45 S 12.85 0.53 0.33 0.64 E edge
ESO 138-05 3 16 53 51.1 -58 46 51 G 8738-3375 13.21 0.59 0.32 0.65 closer on SW edge
ESO 138-05 4 16 53 52.9 -58 47 04 S 13.68 1.22 0.67 1.19 S edge
ESO 138-05 5 16 53 49.6 -58 46 48 G 8738-0618 13.22 1.23 0.72 1.29 farther SW, dbl
NGC 6305 17 18 02.0 -59 09 55 G 8739-2482 13.95 0.66 0.40 0.76 closer on NW edge, dbl
NGC 6407 1 17 44 57.4 -60 44 05 S 15.56 1.03 0.48 1.21 gx sup N side
NGC 6407 2 17 44 59.2 -60 45 03 A 14.30 0.74 0.41 0.79 SSE edge
NGC 6407 3 17 45 02.0 -60 43 54 G 9054-0442 12.99 0.51 0.31 0.60 NE edge
NGC 6483 2 17 59 27.9 -63 40 06 G 9058-3812 14.92 0.85 0.35 0.91 W edge
NGC 6673 18 45 09.8 -62 17 50 S 15.04 0.77 0.43 0.86 E edge
IC 4765 18 47 22.7 -63 19 55 S 15.33 1.23 0.58 1.35 E edge
NGC 6733 1 19 06 07.9 -62 11 42 S 15.18 0.88 0.34 0.83 sup W side
NGC 6733 2 19 06 09.2 -62 11 15 G 9074-2174 14.18 1.04 0.59 1.08 NNW edge,dbl
IC 4842 19 19 20.7 -60 38 30 A 15.12 0.80 0.27 0.64 W edge
NGC 6776 19 25 16.4 -63 51 18 S 14.71 0.65 0.41 1.13 NW edge
NGC 6799 1 19 32 19.0 -55 54 48 G 8765-2178 12.34 0.72 0.39 0.77 SE edge
NGC 6799 2 19 32 13.1 -55 54 56 G 8765-2500 13.61 0.82 0.43 0.82 SW edge
NGC 6799 3 19 32 12.3 -55 54 20 G 8765-2568 14.39 0.71 0.38 0.78 WNW edge
ESO 185-54 20 03 27.2 -55 57 04 S 14.43 0.87 0.48 0.91 S side of core
IC 4943 20 06 29.3 -48 22 57 A 15.85 1.15 0.43 0.92 SE edge
NGC 6849 20 06 13.7 -40 12 17 G 7951-1698 15.45 -0.17 -0.22 -0.28 SW edge; see note
IC 4956 20 11 30.2 -45 35 14 S 14.53 0.92 0.51 0.98 NNW edge
NGC 6877 20 18 35.2 -70 51 17 S 15.81 1.35 0.58 1.28 SSW of nuc
NGC 6903 20 23 45.4 -19 19 15 C 11.56 0.53 0.30 0.62 sup NE side
NGC 6987 20 58 06.3 -48 37 48 G 8412-0444 13.46 1.27 0.81 1.40 W edge
ESO 107-04 21 03 28.5 -67 10 56 S 14.78 1.15 0.85 1.28 SW of nuc, pos uncer
IC 5139 21 50 26.5 -30 59 32 S 14.93 0.56 0.41 0.75 sup NE side
MCG -5-51-28 21 57 57.6 -28 48 14 T 6960-1579 11.07 0.48 0.32 0.59 br * E edge
NGC 7185 22 02 55.6 -20 28 30 S 15.48 1.49 0.26 0.83 sup SW side
IC 5250E 22 47 23.4 -65 03 41 S 14.35 1.08 0.66 1.09 SE of Ern comp
NGC 7484 23 07 05.0 -36 17 17 T 9.87 0.51 0.34 0.60 S edge, HD 218286
Note:
NGC 6849 BPS CS 22964-0209: V=15.36, B-V=0.01. BPS color probably correct,
but Poulain V probably more nearly correct.
uncertain identifications
NGC 2293 ? 6 47 45.3 -26 45 17 S 15.58 1.70 0.43 0.77 E edge
NGC 2293 ? 6 47 41.7 -26 44 57 S 15.58 1.70 0.43 0.77 NW edge
NGC 3082 ? 9 58 54.9 -30 20 57 S 12.05 0.77 0.42 0.78 closer of pair NE
ESO 101-14 1 ?16 48 42.3 -62 36 12 S 14.40 1.00 0.36 1.06 NE of core
ESO 101-14 2 ?16 48 43.0 -62 36 23 S 15.30 1.14 0.47 1.14 E side, crowded
ESO 101-14 3 ?16 48 40.6 -62 36 53 A 9042-0307 14.55 1.05 0.37 0.94 S edge, crowded
ESO 137-45 3 ?16 50 58.5 -60 48 36 A 15.50 1.23 0.07 0.51 off WSW, crowded
ESO 137-45 4 ?16 51 01.2 -60 47 59 A 16.14 1.46 0.51 1.36 off NW, brtr of two
ESO 138-05 1 ?16 53 53.5 -58 46 28 S 15.15 0.07 0.49 0.94 N side of core
IC 1443 ?22 19 05.2 -20 56 07 A 16.49 1.49 0.26 1.08 gx? sup NE side
IC 1443 ?22 19 06.4 -20 56 21 A 16.49 1.49 0.26 1.08 * on E edge
unidentifiable fields
A1443-4 galaxy unidentifiable
NGC 6483 1 very close to center, can't verify
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