Investigation of the nature of inhomogeneous interstellar extinction in the open clusters NGC 2244, 6823, and 6913

Details Investigation of the nature of inhomogeneous interstellar extinction in the open clusters NGC 2244, 6823, and 6913 Investigation of the nature of inhomogeneous interstellar extinction in the open clusters NGC 2244, 6823, and 6913

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990kfnt....6r...8k&link_type=abstract

Kinematika i Fizika Nebesnykh Tel (ISSN 0233-7665), vol. 6, Sept.-Oct. 1990, p. 8-16. In Russian.

Astronomy and Astrophysics

Astronomy

Hertzsprung-Russell Diagram, Interstellar Extinction, Open Clusters, Stellar Color, Stellar Mass, Astronomical Photometry, Inhomogeneity, Kinematics

Scientific paper

On the basis of kinematic, photometric, and spectral data for stars with m(B) not greater than 15.0m, it is found that the inhomogeneity of interstellar extinction in the direction of possible members of open clusters is not caused by differential absorption or abnormal reddening of stars. It is shown that the observed dependence of color excesses on the spectral type is caused by imperfection of kinematic methods of selection of possible cluster members, by uncertainties of the Q-method, by difficulties of the separation of OB association stars from open cluster stars, by the presence in the investigated region of fields with different absorption, and by the observational selection effect in the dark clouds of star formation regions. These factors cause the variation of the R coefficient, lead to the anomalous position of stars on H-R diagrams, increase linear sizes of open clusters with distance, and influence the correct determination of cluster physical parameters.

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