Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....91..186c&link_type=abstract
Astronomy and Astrophysics, vol. 91, no. 1-2, Nov. 1980, p. 186-193.
Astronomy and Astrophysics
Astrophysics
114
Early Stars, Hertzsprung-Russell Diagram, Hydrogen Clouds, Interstellar Extinction, Stellar Spectra, Stellar Spectrophotometry, Astronomical Photography, B Stars, O Stars, Stellar Luminosity, Ubv Spectra
Scientific paper
Multicolor UBVRI photometry of stars towards M 17 demonstrate the existence of a young stellar group with partly heavily obscured O and B stars in this region. The photometric distance of this cluster is found to be 2.2 + or - 0.2 kpc. The photometric data can only be interpreted by assuming an abnormal reddening law with R equals 4.2 inside the dark cloud of M 17. The problem of the energy balance of M 17 is discussed by means of the observed early type stars.
Chini Rolf
Elsaesser Hans
Neckel Th.
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