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Astron. Astrophys. 324, 457-460 (1997)

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2. Observations

Photographs of NGC 6503 in the B and V bands were obtained on October 27, 1984 and July 3, 1986 at the prime focus of the 6 meter telescope with a seeing of FWHM=1.5 arcsec. A reproduction of the blue one is presented in Fig. 1. Later (on July 9, 1994 and March 5, 1995) at the same telescope with a CCD camera we observed two parts of the galaxy indicated in Fig. 1 with rectangles. The south-eastern side of the galaxy was imaged in the B,V,R bands of the Johnson-Cousins system with a matrix of 1160 [FORMULA] 1040 pixels. Frames for the opposite side of NGC 6503 were obtained with a matrix of smaller size, in the V,R bands only. In each case the seeing was [FORMULA] arcsec. To provide a photometric calibration we observed the equatorial standard stars from Landolt (1992). A frame of the SE-side of the galaxy in R band is shown in Fig. 2.

[FIGURE] Fig. 1. A reproduction of NGC 6503 from the 6-meter telescope plate in B band. Two rectangles show the CCD frame location.
[FIGURE] Fig. 2. The south-eastern side of NGC 6503 imaged with the CCD in R band. South-east is at the top. Directions of the X, Y coordinates are indicated.

The images were processed with the MIDAS package. The results of aperture photometry for 55 the bluest and the reddest stars in the SE-area are presented in Table 1. Its columns contain: (1) - the star number, (2), (3) - its rectangular coordinates, directed as indicated in Fig. 2, (4) - apparent V magnitude, (5), (6) - color indices.


Table 1. Photometry of the stars in NGC 6503

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© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998