II/208 BVRI CCD photometry in the field of M 31 (Magnier+ 1992)
BVRI CCD photometry of 361281 objects in the field of M 31 Magnier E.A., Lewin W.H.G., van Paradijs J., Hasinger G., Jain A., Pietsch W., Truemper J. <Astron. Astrophys. Suppl. Ser. 96, 379 (1992)> =1992A&AS...96..379M Astrometry in the field of M 31. Magnier E.A., Lewin W.H.G., van Paradijs J., Hasinger G., Pietsch W., Truemper J. <Astron. Astrophys., 272, 695 (1993)> =1993A&A...272..695M Extension of the Magnier et al. catalogue of objects in the field of M31. Haiman Z., Magnier E., Lewin W.H.G., Lester R.R., van Paradijs J., Hasinger G., Pietsch W., Supper R., Truemper J. <Astron. Astrophys., 286, 725 (1994)> =1994A&A...286..725H
ADC_Keywords: Photometry, CCD ; Regional catalog ; Stars, faint ; Keywords: Galaxies: M31 - photometry - spiral - stellar content Description: Deep BVRI CCD photometry was performed on a 1 square degree region of M31. The observations were made between September 12 and September 27, 1990, using the McGraw-Hill 1.3m telescope at the Michigan-Dartmouth-MIT (MDM) observatory at Kitt Peak. The catalogue has typical completion limits of 22.3Bmag, 22.2Vmag, 22.2Rmag and 20.9Imag. Photometric accuracy is about 2% at Vmag=19. The final astrometric calibrations take into account the systematic error discovered in the Berkhuijsen etal (1987) catalog (Magnier etal 1993). They are in the J2000 system and are eventually tied to the HST Guide Star Catalog. The final photometric calibrations are tied via the NGC 206 region to photometry taken at the Michigan-Dartmouth-MIT (MDM) 1.3m in September and October 1993. These are tied to the Landolt (1992) system of standard stars, and are in the Johnson-Kron-Cousins system (BVRcIc). Caveats: There are several known problems with the catalog. First, there are likely to be some repeated detections of certain sources (i.e., multiple entries for the same object). Second, the wings of bright sources in some cases may be included as distinct sources. Third, the completeness limits are a strong function of position, and a much lower near the core and the core of M32. Fourth, variable stars, blended star, and stars with cosmic ray hits, cosmetic problems or other failures may have highly abnormal colors and magnitudes. In general, we expect these problems to be small, but the user is cautioned to watch for these possible problems. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file bv.dat 143 47776 Stars with both B and V photometry bvi.dat 143 30177 Stars with all B, V and I photometry catalog.dat 143 485388 The catalogue of M31 stars.
Byte-by-byte Description of file: *.dat
Bytes Format Units Label Explanations
2- 7 I6 --- Seq [1,485425]+ Sequence number 9- 17 F9.6 deg RAdeg Right ascension (J2000) 19- 27 F9.6 deg e_RAdeg Scatter for the star, if multiple measurements 29- 37 F9.6 deg DEdeg Declination (J2000) 39- 47 F9.6 deg e_DEdeg Scatter if multiple measurements 49- 55 F7.3 mag Bmag ?=-9.999 B magnitude 57- 61 F5.3 mag e_Bmag ?=0.000 Mean error on Bmag 63- 64 I2 --- o_Bmag [-5,7] Number of detection in B images (2) 66- 71 A6 --- tBmag [0-57] DoPHOT type for each detection (1) 73- 79 F7.3 mag Vmag ?=-9.999 V magnitude 81- 85 F5.3 mag e_Vmag ?=0.000 Mean error on Vmag 87- 88 I2 --- o_Vmag [-6,7] Number of detection in V images (2) 90- 95 A6 --- tVmag [0-57] DoPHOT type for each detection (1) 97-103 F7.3 mag Rmag ?=-9.999 R magnitude (Cousins) 105-109 F5.3 mag e_Rmag ?=0.000 Mean error on Rmag 111-112 I2 --- o_Rmag [-5,6] Number of detection in R images (2) 114-119 A6 --- tRmag [0-57] DoPHOT type for each detection (1) 121-127 F7.3 mag Imag ?=-9.999 I magnitude (Cousins) 129-133 F5.3 mag e_Imag ?=0.000 Mean error on Imag 135-136 I2 --- o_Imag [-5,6] Number of detection in I images (2) 138-143 A6 --- tImag [0-57] DoPHOT type for each detection (1)
Note (1): See Schechter et al. (1993) for a description of DoPHOT; the "DoPHOT types" assign numbers depending of the similarity of the objects profile to the PSF. The definitions are: 1 = star 2 = extended profile (ie, galaxy) 3 = double profile (pair of stars) 4 = failed to converge in 4 parameter fit 5 = large number of bad pixels (ie, near the edge of CCD) 7 = failed to converge in 7 parameter fit. Note (2): negative numbers indicate that the object lies in a crowded area, and is likely to be either a blended image of two stars, or may be mismatched in the other filters.
Acknowledgements: It is a pleasure to thank Eugene Magnier for providing the catalogue. References: Berkhuijsen E.M., Humphreys R.M., Ghigo F.D., Zumach W. =1988A&AS...76...65B, Cats. II/144 and II/145 Haiman Z., Magnier E.A., Lewin W.H.G., Lester R.R., van Paradijs J., Hasinger G., Pietsch W., Supper R., Truemper J. =1994A&A...286..725H Landolt A.U. =1992AJ....104..340L, =Cat. II/183 Magnier E.A., Lewin W.H.G., van Paradijs J., Hasinger G., Jain A., Pietsch W., Truemper J. =1992A&AS...96..379M Magnier E.A., Lewin W.H.G., van Paradijs J., Hasinger G., Pietsch W., Truemper J. =1993A&A...272..695M Schechter P.L., Mateo M., Saha A., =1993PASP..105..134S
(End) Francois Ochsenbein [CDS] 06-Sep-1996
|The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line|