JHK photometric study of the variable interstellar extinction in the direction of open star cluster NGC 654

Details JHK photometric study of the variable interstellar extinction in the direction of open star cluster NGC 654 JHK photometric study of the variable interstellar extinction in the direction of open star cluster NGC 654

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.240..551s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 240, Oct. 1, 1989, p. 551-561.

Astronomy and Astrophysics

Astronomy

9

Interstellar Extinction, Open Clusters, Star Clusters, Early Stars, Stellar Color, Stellar Magnitude

Scientific paper

JHK magnitudes have been determined for 18 stars in the field of NGC 654. Study of the interstellar extinction law in the cluster direction indicates an anomalous distribution of interstellar grains causing more extinction in U and B pass-bands compared to that obtained from the color excesses E(V-J), E(V-H) and E(V-K) using a normal reddening law. This implies a small shift in the grain-size distribution towards smaller than normal-sized particles. Patchy distribution of interstellar matter seems to be responsible for the nonuniform extinction in the cluster region.

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