THE YOUNG OPEN CLUSTER BERKELEY 55

@article{Negueruela2012THEYO,
  title={THE YOUNG OPEN CLUSTER BERKELEY 55},
  author={I. Negueruela and Amparo Marco},
  journal={The Astronomical Journal},
  year={2012},
  volume={143},
  pages={46}
}
We present UBV photometry of the highly reddened and poorly studied open cluster Berkeley 55, revealing an important population of B-type stars and several evolved stars of high luminosity. Intermediate-resolution far-red spectra of several candidate members confirm the presence of one F-type supergiant and six late supergiants or bright giants. The brightest blue stars are mid-B giants. Spectroscopic and photometric analyses indicate an age 50 ± 10 Myr. The cluster is located at a distance d… 
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