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J/AJ/106/964        BVRI photometry of NGC 185 stellar population (Lee+, 1993)

Stellar populations in the dwarf elliptical galaxy NGC 185. Lee M.G., Freedman W.L., Madore B.F. <Astron. J. 106, 964 (1993)> =1993AJ....106..964L (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry ; Photometry, UBVRI ; Photometry, CCD Abstract: BVRI CCD photometry of ∼5300 stars in the central (2'2x3'5) area of the dwarf elliptical galaxy NGC 185 in the Local Group is presented. The color-magnitude diagrams of NGC 185 show three distinct stellar populations: (1) a strong red giant branch (RGB) population, the tip of which is found to be at ITRGB=20.3±0.2mag, and (V-I)TRGB=1.95±0.05, (2) an asymptotic giant branch (AGB) located above the tip of the RGB, and (3) a small number of young stars having blue to yellow colors. The reddening of the bright foreground stars has been determined using the (B-V)-(V-I) diagram to be E(B-V)=0.19±0.03 mag. The distance has been estimated from the I magnitude of the tip of the RGB, giving (m-M)0=23.96±0.21mag for AI=0.38mag, corresponding to 620±60kpc. The mean metallicity of the RGB stars has been determined using the median color of the RGB stars at MI=-3.5mag, (V-I)-3.5,0=1.727mag: giving a mean metallicity of [Fe/H]=-1.23±0.16dex. The dispersion in color at MI=-3.5mag is δ(V-I)-3.5=0.12mag, implying a metallicity dispersion of -1.6<[Fe/H]←0.9dex. Surface photometry of the area within R=50" is also presented, showing that colors get rapidly bluer inside R∼10". A V luminosity function for the blue stars has been derived, the slope of which is very similar to that for other nearby galaxies. The AGB stars extend to Mbol~-5.0mag, and Most of the AGB stars above the tip of the RGB are likely to belong to an intermediate-age population. The bolometric luminosity function of the red giant stars in NGC 185 is found to be very similar to that of M32. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 00 39 01.5 +48 20 27 NGC 185 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3a.dat 45 310 BVRI CCD photometry of stars in NGC 185. table3b.dat 45 80 Blue stars [(B-V)<0.6] in NGC 185.
Byte-by-byte Description of file: table3a.dat table3b.dat
Bytes Format Units Label Explanations
1- 4 I4 --- [LFM93a] Star number ([LFM93a] NNNN in Simbad) 6- 10 F5.1 pix Xpos X position (1) 12- 16 F5.1 pix Ypos Y position (1) 18- 22 F5.2 mag Vmag V magnitude 24- 28 F5.2 mag B-V B-V colour index 30- 34 F5.2 mag V-R ? V-R colour index 36- 39 F4.2 mag V-I ? V-I colour index 41- 45 F5.2 mag Imag ? I magnitude
Note (1): 1 pix = 0.205". North is at the top and east to the left.
History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 03-Apr-2000
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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