Near-infrared observations of trapezium-type multiple systems Catalogue of observations and a new determination of the reddening law

Astronomy and Astrophysics – Astronomy

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Astronomical Catalogs, Infrared Astronomy, Interstellar Extinction, Milky Way Galaxy, Star Clusters, Astronomical Maps, Galactic Evolution, H Ii Regions, Nebulae, Photometry, Tables (Data)

Scientific paper

Results are presented from a large scale near-infrared survey of small sky areas of the Milky Way containing trapezium-type multiple star systems located within young galactic clusters, H II regions or dark nebulosities. Photometric maps at wavelength 2.2 microns complemented by broadband JHKL photometry of the majority of the sources detected and of the star members of the systems were obtained. A number of randomly chosen comparison regions along the galactic plane were also mapped and the results were also used, with recent semi-empirical models, to determine the number of field stars expected for the program surveys. Analyses of the infrared two-color diagrams provide determinations of the values of the color excess ratios E(J-H)/E(H-K), E(H-K)/E(K-L) and E(J-K)/E(K-L). The resulting reddening law is found to differ significantly from that in the direction of the Ophiuchus and Taurus dark clouds and possibly towards the Galactic Center.

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