UBVR CCD photometry of stars in M31. I - Baade's field IV

Details UBVR CCD photometry of stars in M31. I - Baade's field IV UBVR CCD photometry of stars in M31. I - Baade's field IV

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...324..172h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 324, Jan. 1, 1988, p. 172-192.

Astronomy and Astrophysics

Astrophysics

42

Andromeda Galaxy, Astronomical Catalogs, Charge Coupled Devices, Disk Galaxies, Star Distribution, Stellar Spectrophotometry, Ubv Spectra, Data Reduction, Interstellar Extinction, Main Sequence Stars, Red Giant Stars, Stellar Color, Stellar Luminosity

Scientific paper

We report deep UBVR CCD photometry of stars in a portion of an arm of M31, 20 kpc 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 1985, 1986).

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