Since there has been a perennial problem obtaining photometric sequences near galaxies hosting supernovae (once and future), I have started determining coordinates and IDs for stars measured by those who have done multi-aperture photometry of galaxies. In most such publications, stars superposed on galaxies are either ignored (leading to bogus magnitudes for the galaxies themselves) or are taken out via separate measurement (either using a single- channel photometer or CCD) but not reported in publication. The McDonald observers (now all formerly of Univ. of Texas - Austin) have been very thorough not only in measuring superposed stars, but also reporting them in publication. Much of their work is covered in the three Univ. of Texas monographs collecting galaxy photometry from the literature. Those publications have a large number of galaxy field stars measured, and I've just begun to get those identified. As a start, below I show data for a few dozen galaxies in five galaxy clusters observed by Ron Buta and published in 1996. He used mostly the McDonald 75cm and 90cm telescopes. Details of the observations can be found in the source paper. The basic procedure was to measure the galaxy in successively larger photometer apertures (this is all single-channel stuff) in order to obtain a total magnitude and colors for the galaxy. Superposed stars were measured separately using a tiny aperture along with 'sky' measurements of the immediate galaxy background along the same isophote as the star. The results vary in accuracy of course depending on brightness and location within the galaxy. Stars fainter than about mag. 15 will have external uncertainties in the +/- 0.1 mag. range, but brighter stars should be fairly reliable (say 0.03-0.05 mag. errors). It is worth noting that all but one or two of the stars were measured on only a single night. The table below is arranged similarly to my large photometric reference file. It shows the host galaxy name in the first column. Next comes the equinox 2000 position for the star. These are mostly taken from either GSC-ACT ("GSC v1.3") or USNO-A2.0; one was estimated using a SkyView DSS image. The source is indicated in column 's': A = USNO-A2.0, G = GSC-ACT, S = DSS. The GSC number is shown if available. I have copied the V and B-V data from the source paper. I omit the U-B colors since these are for the most part not very reliable simply because the stars are so faint and the galaxy background problematic. The 'Location' column gives a crytic description of where the star is relative to the galaxy nucleus. Some examples: sup SW side superposed on the southwest side of galaxy NW tip near the northwest tip of a spindle-shaped galaxy gx sup SW side measurement is of a galaxy (not a star) superposed on the target object off SE side outside the main body of the galaxy to the southeast In any case the accurate coordinates allow unambiguous identification using digital images. Some isolated stars are marked with 'i' directly before the coordinates. These are far enough from the galaxy that they can be used for generic photometric calibration of photographic or CCD images. I have added these few stars to my generic reference file since they form a useful supplement to existing sequences (http://ftp.lowell.edu/pub/bas/starcats/loneos.phot.gz). This file contains more complete sequences in the fields of over 100 other galaxies. The identifications can be made in the absence of charts based on which aperture the star was included in for the galaxy photometry. This allows one to determine the approximate radius of the star from the galaxy nucleus and the identification then made from a DSS image. There were several cases, however, where this method was either uncertain or fails completely usually because there are several candidate stars. I have asked Dr. Buta if he still had working sketches, but since the observing was done more than 10 years ago they were not easy to retrieve. These uncertain/impossible stars are given in two lists at the bottom. Most of the "uncertain" stars are probably correct, since one can make a fair guess of the identification using relative magnitudes and colors from the GSC and USNO-A. Locations and coords are noted for each candidate so they can be checked with new observations. (N.B. two candidates near NGC 7750 shown for the same star.) Finally, the two unidentifiable fields are roughly described. Besides direct calibration of CCD images from the isolated field stars mentioned previously, the stars can be used to make local adjustments to the GSC or USNO series magnitudes to produce temporary rough sequences for visual observers. All for now; more to follow. \Brian ============================ source: 1996AJ....111..591B BUTA R. Astron. J., 111, 591-602 (1996) Photoelectric UBV photometry of galaxies in the clusters Pegasus I, Pegasus II, Abell 262, Abell 1367, and Abell 2197-9. Host galaxy RA (2000) Dec s GSC V B-V Location NGC 687 1 50 30.9 +36 23 06 A 15.68 0.61 first star NW NGC 703 1 52 38.6 +36 09 53 A 15.81 0.49 sup SW side NGC 708 1 52 46.1 +36 09 20 G 2319-0855 14.76 0.87 sup N side NGC 714 1 53 26.3 +36 13 38 G 2319-0461 15.03 0.91 NW tip NGC 714 1 53 26.9 +36 13 26 A 17.83 -0.10 due W of nuc NGC 717 i 1 53 57.3 +36 13 57 A 15.91 0.80 NE side NGC 735 1 56 36.7 +34 10 48 G 2315-0156 14.13 0.79 sup NW side NGC 735 i 1 56 37.9 +34 09 45 A 16.06 0.54 due S NGC 735 1 56 39.6 +34 09 45 A 15.96 0.84 S of SE tip NGC 797 2 03 28.2 +38 07 21 A 16.88 0.69 sup NNE NGC 797 2 03 24.6 +38 06 44 G 2829-1403 15.76 0.82 gx sup SW side NGC 797 2 03 24.2 +38 07 20 G 2829-1696 13.85 1.11 * NW NGC 818 2 08 47.5 +38 46 49 A 16.06 0.84 ENE edge NGC 834 i 2 11 05.5 +37 40 09 G 2830-0978 13.40 1.42 off E side NGC 845 2 12 21.0 +37 27 43 A 15.49 0.66 S of SE tip NGC 3701 i11 29 29.9 +24 06 27 G 1982-0818 14.90 0.86 off N side NGC 3802 i11 40 20.9 +17 45 06 G 1438-0463 15.43 0.53 off SE NGC 3802 i11 40 23.2 +17 45 54 G 1438-0450 13.86 0.80 off E tip NGC 3842 11 44 00.3 +19 56 29 A 17.77 0.56 sup SW side NGC 3842 11 44 04.7 +19 56 37 A 15.17 1.03 sup SE side NGC 3947 11 53 23.8 +20 45 08 G 1443-2559 15.05 1.14 E edge NGC 3987 11 57 24.3 +25 11 46 A 16.29 0.80 on SE flank NGC 3987 i11 57 26.0 +25 11 18 A 16.48 1.07 off SE side NGC 7495 i23 08 59.0 +12 04 07 G 1164-0931 12.88 0.65 br* NE NGC 7535 23 14 11.7 +13 34 47 G 1167-0500 15.10 0.74 n=2;sup SW side NGC 7535 23 14 16.3 +13 34 32 A 16.22 0.69 off ESE NGC 7536 23 14 11.5 +13 24 55 A 16.56 0.62 SW edge NGC 7563 23 15 53.3 +13 12 00 G 1167-1567 15.42 1.33 NW edge NGC 7570 23 16 43.5 +13 28 41 A 16.46 0.75 sup SW side NGC 7591 23 18 17.9 +06 34 28 A 16.14 1.63 sup SE side NGC 7593 23 17 58.8 +11 21 11 A 15.51 0.36 NE edge NGC 7626 23 20 39.0 +08 13 07 G 1162-0514 14.51 0.76 W edge NGC 7634 23 21 42.2 +08 52 53 G 1162-1248 14.12 0.53 sup SSE side NGC 7648 23 23 56.2 +09 40 01 A 1162-0197 15.31 0.71 E edge NGC 7648 23 23 51.2 +09 40 00 A 16.01 0.81 W edge IC 5309 23 19 11.6 +08 06 12 G 1162-1766 14.37 0.75 sup S side IC 5309 i23 19 15.0 +08 06 22 A 15.54 0.88 off E side UGC 1344 1 52 34.7 +36 29 38 G 2319-0343 10.78 0.62 sup S side UGC 1347 1 52 45.5 +36 37 02 S 15.11 0.52 sup SW of nuc UGC 6670 i11 42 27.4 +18 19 33 A 16.60 0.37 off SW flank UGC 10436 16 31 01.2 +41 09 54 A 17.04 1.77 NW edge UGC 10488 i16 38 06.3 +39 54 35 A 17.10 1.36 off SW side UGC 12361 23 06 24.8 +11 17 16 A 17.49 0.73 E tip UGC 12370 i23 07 06.6 +09 58 24 G 1160-0162 10.68 0.49 N side UGC 12423 23 13 13.9 +06 25 00 G 0583-0651 14.98 0.96 SSE of center UGC 12497 i23 19 14.1 +07 42 50 A 17.12 0.73 off NE UGC 12544 23 21 47.9 +09 04 01 G 1162-0570 14.94 0.64 just off SE edge UGC 12571 i23 23 21.9 +13 19 49 A 15.70 0.78 off N side MCG +7-34-35 i16 26 49.6 +41 15 54 G 3066-0702 12.96 0.80 off NW CGCG 406-82 23 21 17.9 +07 28 22 A 15.30 0.71 close dbl uncertain identifications NGC 753 ? 1 57 42.1 +35 55 42 A 16.07 0.88 due N NGC 753 ? 1 57 38.1 +35 54 47 A 16.09 1.18 due W NGC 7495 ?23 08 57.8 +12 03 33 A 15.70 0.95 closer on N NGC 7495 ?23 08 57.4 +12 03 50 A 16.01 0.95 farther N NGC 7643 i?23 22 54.0 +11 58 14 A 16.95 0.63 off SE NGC 7750 ?23 46 36.1 +03 48 14 A 16.56 0.79 NW edge NGC 7750 ?23 46 38.0 +03 49 11 A 16.56 0.79 off N end IC 1474 ?23 12 50.6 +05 48 54 A 17.34 0.73 gx N end UGC 12304 i?23 01 14.7 +05 39 00 A 17.45 0.74 off E unidentifiable fields NGC 801 five similarly-bright stars UGC 1350 three stars