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pro vyhledávání: '"Víctor J. S. Béjar"'
Publikováno v:
Astronomische Nachrichten. 325:705-713
We present an RI photometric survey covering an area of 430 arcmin^2 around the multiple star Sigma Orionis. The observations were conducted with the 0.8 m IAC-80 Telescope at the Teide Observatory. The survey limiting R and I magnitudes are 22.5 and