Stellar content of the interacting galaxies of the M51 system

@article{Tikhonov2009StellarCO,
  title={Stellar content of the interacting galaxies of the M51 system},
  author={Nikolay A. Tikhonov and O. A. Galazutdinova and E. N. Tikhonov},
  journal={Astronomy Letters},
  year={2009},
  volume={35},
  pages={599-608}
}
Based on archival Hubble Space Telescope ACS/WFC images, we have performed stellar photometry for more than 0.6 million stars in the interacting galaxies NGC 5194 and NGC 5195 of the M51 system. Stars of various ages have been identified on the constructed Hertzsprung-Russell diagram: blue and red supergiants, AGB stars, and red giants. The distance to M51 has been measured from the position of the tip of the red giant branch, D = 9.9 ± 0.7 Mpc. We have determined the change in the metallicity… 
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