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J/ApJ/324/172       M31 UBVR photometry (Hodge+, 1988)

UBVR CCD photometry of stars in M 31. I. Baade's field IV Hodge P., Lee M.G., Mateo M. <Astrophys. J. 324, 172 (1988)> =1988ApJ...324..172H (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry ; Photometry, CCD Keywords: galaxies: individual (M 31) - galaxies: photometry - galaxies: stellar content- luminosity function Description: We report deep UBVR CCD photometry of stars in a portion of an arm of M 31, 20kpc southwest of the nucleus. The color-magnitude diagram shows a main sequence that reaches from Mv=-0.7 (at our photometric limit) to Mv=-6.2 and a well-populated giant region. The R, B-R diagram separates the stars rather clearly into three groups, the main sequence, intermediate-color stars (which include the brighter foreground stars), and the red giants. Reddening is found to average E(B-V)=0.13±0.04. To determine a reliable luminosity function, we have eliminated foreground contamination and have evaluated our sample completeness, using a large number of artificial stars in the DAOPHOT reduction routine. The corrected luminosity function, which extends from Mv=-5 to -1, has a logarithmic slope of 0.57±0.07 for all stars and 0.53±0.06 for main-sequence stars only. This value is similar to that reported for galaxies in general (Freedman 1985ApJ...299...74F and 1986, IAUS 116, 61). Objects: ----------------------------------------- RA (2000) DE Designation(s) ----------------------------------------- 00 42.7 +41 16 M 31 = NGC 224 ----------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 80 695 Results of UBVR CCD photometry
Byte-by-byte Description of file: table1
Bytes Format Units Label Explanations
1- 3 I3 --- Star Star number 5- 10 F6.2 pix Xpos X position (1) 12- 17 F6.2 pix Ypos Y position (1) 19- 24 F6.3 mag Vmag V magnitude 26- 30 F5.3 mag e_Vmag rms uncertainty on Vmag 32- 37 F6.3 mag B-V ? B-V color index 39- 43 F5.3 mag e_B-V ? rms uncertainty on B-V 45- 50 F6.3 mag U-B ? U-B color index 52- 56 F5.3 mag e_U-B ? rms uncertainty on U-B 59- 64 F6.3 mag V-R ? V-R color index 66- 70 F5.3 mag e_V-R ? rms uncertainty on V-R
Note (1): Increasing left to right, bottom to top, in Fig. 2.
References: Hodge P. & Lee M.G., Paper II. 1988, ApJ 329, 651 =1988ApJ...329..651H History: Prepared via OCR at CDS.
(End) Marie-Jose Wagner, Patricia Bauer [CDS] 30-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

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