Multicolor CCD Photometry of Supergiants in the Disk of NGC 628

Details Multicolor CCD Photometry of Supergiants in the Disk of NGC 628 Multicolor CCD Photometry of Supergiants in the Disk of NGC 628

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....111.2280s&link_type=abstract

Astronomical Journal v.111, p.2280

Astronomy and Astrophysics

Astronomy

28

Galaxies: Individual: Ngc 628, Supergiants, Galaxies: Stellar Content

Scientific paper

We use VRI CCD images with sub-arcsec spatial resolution to investigate the photometric properties of red and blue supergiants in the nearby spiral galaxy NGC 628. Existing photometric surveys are used to identify H II regions, the majority of which have non-stellar colors. After removing these objects from our sample we are left with ~310 stars. The (V - R, R - I) two-color diagram of these objects suggests that the majority have spectral types F, G, and K, indicating that residual contamination from non-stellar objects is negligible. Comparisons with theoretical evolutionary tracks indicate that the majority of supergiants in our field have progenitor masses below 25 M_sun_. The luminosity functions in all three bandpasses follow power laws, with the exponent in V = 0.80+/-0.12, in good agreement with what is seen in other galaxies. The brightest RSGs occur at V ~ 21.0, from which we derive a distance modulus of 29.3.

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