UBVI and Ha Photometry of the h & chi Persei cluster

@article{Keller2001UBVIAH,
  title={UBVI and Ha Photometry of the h \& chi Persei cluster},
  author={Stefan C. Keller and Eva K. Grebel and Grant J. Miller and Kenneth M. Yoss},
  journal={arXiv: Astrophysics},
  year={2001}
}
UBVI and Ha photometry is presented for 17319 stars in vicinity of the young double cluster h & chi Persei. Our photometry extends over a 37arcmin x 1arcdeg field centered on the association. We construct reddening contours within the imaged field. We find that the two clusters share a common distance modulus of 11.75$\pm$0.05 and ages of log age(yr) = 7.1$\pm$0.1. From the V-Ha colour, a measure of the Ha emission strength, we conduct a survey for emission line objects within the association… 
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References

Near-infrared and visual photometry of h and chi persei
Photometrie a bande large dans l'IR proche dans les bandes JHK (et parfois L' et M) de 82 etoiles de h et χ Per. On donne egalement la photometrie photoelectrique UBV de 24 etoiles dont seule la